Welcome To the Hoffman Amplifiers Forum

September 07, 2025, 02:36:04 pm
guest image
Welcome, Guest. Please login or register.
-User Name
-Password



Hoffman Amps Forum image Author Topic: 6G3 Capacitor Question  (Read 53460 times)

0 Members and 1 Guest are viewing this topic.

Offline dwinstonwood

  • Level 3
  • ***
  • Posts: 1217
  • I love Tube amps
Hoffman Amps Forum image
Re: 6G3 Capacitor Question
« Reply #150 on: July 10, 2020, 03:46:25 pm »
Thanks bmccowan!
I took some extra care soldering the ground buss. I sanded the backs of the pots, cleaned them with lacquer thinner, put an extra-wide tip on the Hakko and set the temperature to 800.  :icon_biggrin: The solder joints seem really solid.
This was the first time I'd done this. I'm sure control panels are routine for everyone here. But, I really had to plan and think it out. I can't imagine trying to assemble it inside the chassis, especially the way it angles inward.
I had overlooked buying those Alpha pot spacer/washers that Hoffman sells. But, I found a bag full of propeller shaft spacers from my other hobby (r/c planes) that were a perfect fit. So, the pots are perfectly centered in the holes.
Anyway, I can go over it and make sure every cap and resistor is firmly soldered to the buss wire.

I just finished drilling the necessary holes in the eyelet boards. I'll populate the main board tonight. I made paper templates for drilling the chassis.

Online bmccowan

  • Level 3
  • ***
  • Posts: 1744
  • Better builder than player
Hoffman Amps Forum image
Re: 6G3 Capacitor Question
« Reply #151 on: July 10, 2020, 06:10:41 pm »
Quote
I took some extra care soldering the ground buss. I sanded the backs of the pots, cleaned them with lacquer thinner, put an extra-wide tip on the Hakko and set the temperature to 800.
You are taking the care that I did not, so I don't think you'll suffer the fate I did. 6 years ago I did not know this Forum and its been a huge help. Before that my source of info were Gerald Weber books - some good info and a lot of fantasy.
Mac
“To my surprise, when I opened my eyes, I was the victim of a great compromise.”
John Prine

Offline dwinstonwood

  • Level 3
  • ***
  • Posts: 1217
  • I love Tube amps
Hoffman Amps Forum image
Re: 6G3 Capacitor Question
« Reply #152 on: July 10, 2020, 07:57:49 pm »
bmccowan, building a tube amp has been a goal of mine for 35yrs. It was never something I could have done on my own. I read some books, but didn't have the confidence, or the basic understanding to even start.
You're right, this forum is the reason I'm on my second guitar amp. If you're self-taught that's a remarkable achievement. I also have an old Gerald Weber book of schematics that I've held onto through four moves; I was determined to do this one day!

Offline HotBluePlates

  • Global Moderator
  • Level 5
  • ******
  • Posts: 13127
Hoffman Amps Forum image
Re: 6G3 Capacitor Question
« Reply #153 on: July 11, 2020, 03:31:17 am »
... were Gerald Weber books - some good info and a lot of fantasy.

I had to un-learn a lot of things I read in his books.

Tubebooks.org is a very good resource.

Offline dwinstonwood

  • Level 3
  • ***
  • Posts: 1217
  • I love Tube amps
Hoffman Amps Forum image
Re: 6G3 Capacitor Question
« Reply #154 on: July 11, 2020, 11:53:19 am »
Thanks for the link HotBluePlates. I'm looking at the dept. of Army & Air Force book first.

I soldered the components onto the boards. Taking a lunch break and I'll start planning out the wires I need to attach. :icon_biggrin: There's one missing resistor (15K) on the main board; if I only overlooked one part with this project that's a major improvement over my AC4 build.

Online bmccowan

  • Level 3
  • ***
  • Posts: 1744
  • Better builder than player
Hoffman Amps Forum image
Re: 6G3 Capacitor Question
« Reply #155 on: July 11, 2020, 11:54:30 am »
Quote
If you're self-taught
Mostly - I got started about 25 years ago pretty much by accident, and not being able to resist good deals.
First one - rummaging through a huge secondhand store that was getting ready to close for good, I spotted a 300b Fisher power amp with 4-EL34s in nice shape. The owner saw me looking at it and told me I could take it for $25. if and only if I also took the matching preamp and a serviceman's tube caddy full of tubes - all for $25!
I was busy building a house so I put them all in the basement.
A month later I spot a Fender Princeton Reverb at a flea market. The guy selling it said it did not work so he wanted $60. I recorded his driver license info in case in turned out to be stolen. It was clear, so it joined the others in the basement. A couple years later I walked past the amps and thought I'd give it a shot. I quickly found a broken connection in the Princeton; bought a soldering iron and some solder and fixed it. It worked but sounded like mud. So I read up a bit, bought a multi-meter, caps and resistors and after getting the safety stuff down - dove in. This Forum helps me continue to get better at the craft. I admire the work that many do here, and I will never have the patience or skill to make the beautifully aligned circuitry that some craft. But I make and fix some damn nice sounding amps. and that's good enough for me.   
Mac
“To my surprise, when I opened my eyes, I was the victim of a great compromise.”
John Prine

Offline sluckey

  • Level 5
  • *******
  • Posts: 5075
    • Sluckey Amps
Hoffman Amps Forum image
Re: 6G3 Capacitor Question
« Reply #156 on: July 11, 2020, 12:11:09 pm »
I soldered the components onto the boards. Taking a lunch break and I'll start planning out the wires I need to attach.
Next time put your interconnecting wires into the eyelets and bend them over the rim BEFORE you solder the components. You'll probably know why I say that before you finish.   :icon_biggrin:
A schematic, layout, and hi-rez pics are very useful for troubleshooting your amp. Don't wait to be asked. JUST DO IT!

Offline dwinstonwood

  • Level 3
  • ***
  • Posts: 1217
  • I love Tube amps
Hoffman Amps Forum image
Re: 6G3 Capacitor Question
« Reply #157 on: July 11, 2020, 12:56:07 pm »
Next time put your interconnecting wires into the eyelets and bend them over the rim BEFORE you solder the components. You'll probably know why I say that before you finish.   :icon_biggrin:

Yep, I can already see how that's a better way!  :embarrassed: Well, at least I installed all of the component leads in the eyelets before soldering.
The only saving grace is that I'm using Hoffman's solid, cloth-covered wire. I can either melt the solder in the eyelets and push the wire in, or, bend a small hook and loop it around a component lead, which I guess, must have been my plan. :icon_biggrin:

Offline shooter

  • Level 5
  • *******
  • Posts: 11015
  • Karma Loves haters
Hoffman Amps Forum image
Re: 6G3 Capacitor Question
« Reply #158 on: July 11, 2020, 01:34:53 pm »
Quote
loop it around a component lead
:laugh:
yep
I even add them with turrets, just makes it easier, AND, when there's no more loose wires, it's guitar time  :icon_biggrin:
Went Class C for efficiency

Offline sluckey

  • Level 5
  • *******
  • Posts: 5075
    • Sluckey Amps
Hoffman Amps Forum image
Re: 6G3 Capacitor Question
« Reply #159 on: July 11, 2020, 01:41:07 pm »
Quote
bend a small hook and loop it around a component lead, which I guess, must have been my plan.
Yuck! Why would you do such a nice looking board and then crap on it?
A schematic, layout, and hi-rez pics are very useful for troubleshooting your amp. Don't wait to be asked. JUST DO IT!

Online bmccowan

  • Level 3
  • ***
  • Posts: 1744
  • Better builder than player
Hoffman Amps Forum image
Re: 6G3 Capacitor Question
« Reply #160 on: July 11, 2020, 01:44:54 pm »
I'm with Sluckey. I build with turrets, but when I repair amps with eyelet boards, I melt the solder, poke in the wire and bend it over before the solder sets. When done I go back over each connection. With the newer wimpy component leads, there is a lot of room in the eyelets - not so much with components from the 50s.
Mac
“To my surprise, when I opened my eyes, I was the victim of a great compromise.”
John Prine

Offline dwinstonwood

  • Level 3
  • ***
  • Posts: 1217
  • I love Tube amps
Hoffman Amps Forum image
Re: 6G3 Capacitor Question
« Reply #161 on: July 11, 2020, 02:43:06 pm »
OK!  :laugh:

I will heat up the eyelets, and push the solid wire in. It will actually be pretty easy to do. Plus, as you say, bmccowan, I totally intend to go over every joint and make sure it's well soldered.

Fortunately, there's only one wire connection point on the entire board with more than two component leads. All the rest still have plenty of free space inside the eyelets.

But, I do appreciate being called out on taking shortcuts sluckey. Don't ask me why I'd invest all this time and money in a project and still look for the quick&dirty way. :dontknow:

Offline shooter

  • Level 5
  • *******
  • Posts: 11015
  • Karma Loves haters
Hoffman Amps Forum image
Re: 6G3 Capacitor Question
« Reply #162 on: July 11, 2020, 03:05:02 pm »
Quote
I melt the solder, poke in the wire and bend it over before the solder sets

Not a recommended way to "re-flow" solder.  It gets brittle, cracks easier.  clean it out start with new solder.

IF you can get 2 - 3 wraps around the "imbedded" leads and a light touch solder, you get a pretty good looking "wire wrap" look, too much solder looks like Billy-Bobs '56 dashboard wires  :icon_biggrin:
Went Class C for efficiency

Online bmccowan

  • Level 3
  • ***
  • Posts: 1744
  • Better builder than player
Hoffman Amps Forum image
Re: 6G3 Capacitor Question
« Reply #163 on: July 11, 2020, 03:09:23 pm »
Quote
shortcut
Actually to my mind inserting all the wires and all the component leads in the eyelets prior to soldering is a shortcut - but a good short cut. Solder connections only once. It also allows you to more easily put a slight bend in the wire for a bit of mechanical connection. I leave all the leads exiting the board extra long so that when I trim them to fit, I have a usable length of wire left over, not a bunch of tiny scraps. But that's just the thrifty Scot in me trying to avoid waste.
Mac
“To my surprise, when I opened my eyes, I was the victim of a great compromise.”
John Prine

Online bmccowan

  • Level 3
  • ***
  • Posts: 1744
  • Better builder than player
Hoffman Amps Forum image
Re: 6G3 Capacitor Question
« Reply #164 on: July 11, 2020, 06:08:36 pm »
Quote
Not a recommended way to "re-flow" solder
I understand, and if the solder does not seems to be reflowing right I do remove it with a solder sucker and start fresh. I assume that with fresh solder in the eyelets of this amp, it would reflow fine. But my assumption could be wrong. :dontknow: Oddly I always remove the old solder from tube sockets and terminal strips, clean them good and add a bit of flux. So I guess I'm inconsistent with the eyelets.
But I do not wrap wire 2 or 3 times as it is such a pain to work on an amp where a previous tech did that.
Mac
“To my surprise, when I opened my eyes, I was the victim of a great compromise.”
John Prine

Online bmccowan

  • Level 3
  • ***
  • Posts: 1744
  • Better builder than player
Hoffman Amps Forum image
Re: 6G3 Capacitor Question
« Reply #165 on: July 11, 2020, 08:55:09 pm »
And here is Doug's piece on that process from "servicing Fender amps":
Quote
Heat up the positive side first and push the lead down into the hot solder. I do all the caps positive ends first and then push any shared negative wires into the hole at one time.
I was worried that I'd been screwing up, so I looked for some info - at least I have some expert company!
Mac
“To my surprise, when I opened my eyes, I was the victim of a great compromise.”
John Prine

Offline dwinstonwood

  • Level 3
  • ***
  • Posts: 1217
  • I love Tube amps
Hoffman Amps Forum image
Re: 6G3 Capacitor Question
« Reply #166 on: July 11, 2020, 09:44:55 pm »
While cutting lengths of wire, it suddenly occurred to me that I should place everything in the chassis and see - for the first time - how things are going to fit (or, not).

It's going to be tight. The bias board can't go left because the pilot light fixture is there. The filter cap board can't really go anywhere other than exactly where it is. The main board shouldn't go to the right because of the mounting bolt hole (although, I plan to use Rivnuts on the flange, so that hole might not get used). That leaves the bias pot. It's in the only available place it can be, almost... I'm not installing the ground switch on the back panel, so maybe that would be a clever location for it? It's a pretty long wire run back to the Intensity pot. [Although, after watching the Uncle Doug 6G3 video I really wanted to use that spot for a NF on/off switch.]
It's that slanted control panel that eats up valuable room. But, it's a Fender.
Thoughts?

Offline sluckey

  • Level 5
  • *******
  • Posts: 5075
    • Sluckey Amps
Hoffman Amps Forum image
Re: 6G3 Capacitor Question
« Reply #167 on: July 11, 2020, 09:58:32 pm »
Put the cap board on the outside of the chassis like Leo did.
A schematic, layout, and hi-rez pics are very useful for troubleshooting your amp. Don't wait to be asked. JUST DO IT!

Offline dwinstonwood

  • Level 3
  • ***
  • Posts: 1217
  • I love Tube amps
Hoffman Amps Forum image
Re: 6G3 Capacitor Question
« Reply #168 on: July 12, 2020, 08:05:43 am »
Thanks. I went over my layout a bit more, and the one in my photo is going to work fine. I did price an external cap pan, and with shipping that's close to $30 I can put toward tubes, cabinet, or speaker.

I also read up on Hoffman's installation method, but my chassis is too shallow to fit the caps under the pots (see his photo below).

It looks like some older Marshalls, etc., used multi-section caps to take up less space in the area near the PT.

I'm staying the course and focusing on finishing. :icon_biggrin:



Offline sluckey

  • Level 5
  • *******
  • Posts: 5075
    • Sluckey Amps
Hoffman Amps Forum image
Re: 6G3 Capacitor Question
« Reply #169 on: July 12, 2020, 08:20:02 am »
I still vote for putting the cap board on the outside. You don't heve to have a cap pan. Here's one alternative that I used on my TDR...

     http://sluckeyamps.com/tdr/tdr_04.jpg
A schematic, layout, and hi-rez pics are very useful for troubleshooting your amp. Don't wait to be asked. JUST DO IT!

Online bmccowan

  • Level 3
  • ***
  • Posts: 1744
  • Better builder than player
Hoffman Amps Forum image
Re: 6G3 Capacitor Question
« Reply #170 on: July 12, 2020, 08:42:49 am »
You may regret squeezing everything so tight. If you don't want to buy a doghouse or build Sluckey's thing of beauty. Two options I can think of:
That cap board has a lot of free space you could squeeze the caps together, trim off a set of eyelets and add an eyelet on the positive side - the neg side can share.
Or do similar but buy an F&T 2x16 cap for the first two filters.
Or my choice - we can't go to bars or restaurants these days, use the money saved to buy that doghouse.
Mac
“To my surprise, when I opened my eyes, I was the victim of a great compromise.”
John Prine

Offline dwinstonwood

  • Level 3
  • ***
  • Posts: 1217
  • I love Tube amps
Hoffman Amps Forum image
Re: 6G3 Capacitor Question
« Reply #171 on: July 12, 2020, 10:36:13 am »
Man, you guys are tough.

Well, I went ahead and drilled the chassis for my Hoffman filter cap board. I may still need to trim the long sides a hair; I won't know until the I have the pan.
The pan hole centers  on my chassis are 5.75" x 3"so I can use this one:
https://www.tubesandmore.com/products/capacitor-cover-fender-reissue-vibroverb
I'm buying the tubes from them anyway, so I might save a bit on shipping.

I've already drilled the chassis for the main and bias boards. They're staying where they are; I'm not drilling anymore holes! :icon_biggrin: Also, I've already installed the bias pot, and it's not moving, either.

But, if I go with the external filter cap setup one of you here is going to have to either explain the very confusing blue area on the original schematic (see attachment), or sketch a simpler, better wiring scenario for me. :icon_biggrin: I can't stare at that corner of the board any longer.

Online bmccowan

  • Level 3
  • ***
  • Posts: 1744
  • Better builder than player
Hoffman Amps Forum image
Re: 6G3 Capacitor Question
« Reply #172 on: July 12, 2020, 11:05:21 am »
do you have some rubber grommets for those through chassis holes?
Mac
“To my surprise, when I opened my eyes, I was the victim of a great compromise.”
John Prine

Offline shooter

  • Level 5
  • *******
  • Posts: 11015
  • Karma Loves haters
Hoffman Amps Forum image
Re: 6G3 Capacitor Question
« Reply #173 on: July 12, 2020, 11:39:51 am »
Quote
I can't stare at that corner of the board any longer.

stare at the schematic, start with the tube pins indicated in the layout, you'll "see" the fog lift  :icon_biggrin:
Went Class C for efficiency

Offline sluckey

  • Level 5
  • *******
  • Posts: 5075
    • Sluckey Amps
Hoffman Amps Forum image
Re: 6G3 Capacitor Question
« Reply #174 on: July 12, 2020, 12:03:07 pm »
Stare at this...
A schematic, layout, and hi-rez pics are very useful for troubleshooting your amp. Don't wait to be asked. JUST DO IT!

Online bmccowan

  • Level 3
  • ***
  • Posts: 1744
  • Better builder than player
Hoffman Amps Forum image
Re: 6G3 Capacitor Question
« Reply #175 on: July 12, 2020, 12:05:30 pm »
And maybe this too
Mac
“To my surprise, when I opened my eyes, I was the victim of a great compromise.”
John Prine

Offline dwinstonwood

  • Level 3
  • ***
  • Posts: 1217
  • I love Tube amps
Hoffman Amps Forum image
Re: 6G3 Capacitor Question
« Reply #176 on: July 12, 2020, 12:10:07 pm »
do you have some rubber grommets for those through chassis holes?
Yes, you can see where I've already installed them for the OPT wire holes, I just haven't put them in yet for the external cap setup.

Quote
I can't stare at that corner of the board any longer.

stare at the schematic, start with the tube pins indicated in the layout, you'll "see" the fog lift  :icon_biggrin:
I understand how to wire the amp. I had it wired correctly with the filter cap board inside the chassis. It's the weird area inside the blue rectangle in my attachment that I can't decipher! :w2:

Everything should start with the wire from pin 8 of the GZ34. It should go straight to the positive terminal of the first filter cap. The red wire from the OPT should also connect there. The tremolo plate - second plate of V2 - is fed from that node.

The second node - positive terminal of the second filter cap - supplies pins four of the 6V6's.

The third node - positive terminal of the third filter cap - supplies pins 1 & 6 of v3 - the PI tube.

And, the fourth node - positive terminal of the fourth filter cap - supplies V1's plates, and the first plate of V2.

All that I completely understand. It's the area inside the blue rectangle that makes no sense to me.

So, I'm just going to ignore that "doodling" on the original schematic and wire the board as I described above. :icon_biggrin:
« Last Edit: July 12, 2020, 12:12:48 pm by dwinstonwood »

Offline dwinstonwood

  • Level 3
  • ***
  • Posts: 1217
  • I love Tube amps
Hoffman Amps Forum image
Re: 6G3 Capacitor Question
« Reply #177 on: July 12, 2020, 12:15:25 pm »
Oops, sluckey, you and bmccowan both posted while I was typing my last post.

sluckey, your diagram clears it all up!

Thanks. I like the idea of running the yellow wires straight to the tubes.

And, yes, all of my boards will be sitting on 1/4" nylon standoffs.
« Last Edit: July 12, 2020, 12:18:05 pm by dwinstonwood »

Offline sluckey

  • Level 5
  • *******
  • Posts: 5075
    • Sluckey Amps
Hoffman Amps Forum image
Re: 6G3 Capacitor Question
« Reply #178 on: July 12, 2020, 12:19:51 pm »
That cap board has two ground wires...
A schematic, layout, and hi-rez pics are very useful for troubleshooting your amp. Don't wait to be asked. JUST DO IT!

Offline dwinstonwood

  • Level 3
  • ***
  • Posts: 1217
  • I love Tube amps
Hoffman Amps Forum image
Re: 6G3 Capacitor Question
« Reply #179 on: July 12, 2020, 12:36:05 pm »
That cap board has two ground wires...

Excellent, I see it now. So does mine!

Offline dwinstonwood

  • Level 3
  • ***
  • Posts: 1217
  • I love Tube amps
Hoffman Amps Forum image
Re: 6G3 Capacitor Question
« Reply #180 on: July 12, 2020, 03:17:04 pm »
Pushing the wires through the eyelets proved easy enough. I'll use RG174 for the two input runs (I had enough on hand).

Still a couple more wires to add.
I'm running the tremolo plate wire straight to the filter cap board instead of bouncing off the corner of the main board and then back again - any reason not to do this?
I'll follow sluckey's advice and run the yellow wire straight from the filter cap board to pins 4 of the 6V6's.
I guess I'll go ahead and run pin 8 of the GZ34 and the OPT CT to the main board first, and then hop them over to the filter cap board as shown on the schematic.

I'm pretty drained, so this is enough for right now.

Offline sluckey

  • Level 5
  • *******
  • Posts: 5075
    • Sluckey Amps
Hoffman Amps Forum image
Re: 6G3 Capacitor Question
« Reply #181 on: July 12, 2020, 03:39:51 pm »
I would run the two input shielded cables under the board straight to V1 tube socket. No sane reason to thread those cables through the board. Make it easy on yourself. Install those two cables ***BEFORE*** you even put the board in the chassis.

     http://sluckeyamps.com/supro/s-11.jpg
     http://sluckeyamps.com/6v6plexi/P-6V6_04.jpg
     http://sluckeyamps.com/VAC15/15.jpg


A schematic, layout, and hi-rez pics are very useful for troubleshooting your amp. Don't wait to be asked. JUST DO IT!

Offline dwinstonwood

  • Level 3
  • ***
  • Posts: 1217
  • I love Tube amps
Hoffman Amps Forum image
Re: 6G3 Capacitor Question
« Reply #182 on: July 12, 2020, 04:46:35 pm »
That sounds like a plan.

I'd like to try wiring a ground buss like you did on those amps. Looks really functional and neat.

Online bmccowan

  • Level 3
  • ***
  • Posts: 1744
  • Better builder than player
Hoffman Amps Forum image
Re: 6G3 Capacitor Question
« Reply #183 on: July 12, 2020, 05:22:05 pm »
That ground buss method works great. When I saw Sluckey's method I immediately switched to it. I have yet to switch to his heater wiring method but I trust that he does not build noisy amps. But I'm also sure the twisted pair police are on his trail. Heater wiring is a pain especially on 9 pin sockets - anything to make it more enjoyable.
Mac
“To my surprise, when I opened my eyes, I was the victim of a great compromise.”
John Prine

Offline dwinstonwood

  • Level 3
  • ***
  • Posts: 1217
  • I love Tube amps
Hoffman Amps Forum image
Re: 6G3 Capacitor Question
« Reply #184 on: July 12, 2020, 05:51:30 pm »
bmccowan, I'm doing the "Fender down from above" heater wiring. Yep, I'm a bit concerned about the 9-pin sockets because I'm using Hoffman's 18ga green cloth wire. This stuff seems thick and heavy for those tiny socket eyelets. But, it will make for very rigid wiring.

Does anyone ever learn every technical improvement and then finally build the perfect amp? :icon_biggrin:

Speaking of Hoffman, I followed his instructions for prepping the RG174 wire:

Offline shooter

  • Level 5
  • *******
  • Posts: 11015
  • Karma Loves haters
Hoffman Amps Forum image
Re: 6G3 Capacitor Question
« Reply #185 on: July 12, 2020, 06:10:27 pm »
make sure n ohm shield to center, just in case  :laugh:

and to "perfect", I like to think professional, or at least top drawer amateur, that walkin on water gets tough some days  :icon_biggrin:
Went Class C for efficiency

Online bmccowan

  • Level 3
  • ***
  • Posts: 1744
  • Better builder than player
Hoffman Amps Forum image
Re: 6G3 Capacitor Question
« Reply #186 on: July 12, 2020, 06:43:01 pm »
Perfect can be the enemy of good. And the enemy of finishing an amp so you can play your guitar!
I use that heavy 18 for the octal sockets and then go down a size for preamp tubes (octal or 9 pin) I think others here do the same. There are some tricks for getting that 18 gauge doubled up into 9 pin sockets - but not worth the trouble IMO. You should see the wimpy heater wire that Hammond used on their organs, and a B3 is about the most glorious sound in the world.
Mac
“To my surprise, when I opened my eyes, I was the victim of a great compromise.”
John Prine

Offline dwinstonwood

  • Level 3
  • ***
  • Posts: 1217
  • I love Tube amps
Hoffman Amps Forum image
Re: 6G3 Capacitor Question
« Reply #187 on: July 12, 2020, 07:25:19 pm »
make sure n ohm shield to center, just in case  :laugh:

and to "perfect", I like to think professional, or at least top drawer amateur, that walkin on water gets tough some days  :icon_biggrin:

Off range on my meter!  :icon_biggrin:

What I was really getting at is that there's always a new (and, sometimes better) technique to building amps, it seems. I find myself in that situation where I'm thinking, "cool, I'll use that on my next amp project." So, I'm already thinking there's going to be a "next project."  :sad2: I think I was warned.

Offline shooter

  • Level 5
  • *******
  • Posts: 11015
  • Karma Loves haters
Hoffman Amps Forum image
Re: 6G3 Capacitor Question
« Reply #188 on: July 12, 2020, 07:31:12 pm »
Quote
there's always a new
sometimes called "best practices"
Ideally you're always "finding the new..", otherwise you're repeating the past  :m17
Went Class C for efficiency

Offline sluckey

  • Level 5
  • *******
  • Posts: 5075
    • Sluckey Amps
Hoffman Amps Forum image
Re: 6G3 Capacitor Question
« Reply #189 on: July 12, 2020, 07:57:54 pm »
I would never try to poke two 18AWG wires into the lugs on a nine pin socket. 22AWG only for me.
A schematic, layout, and hi-rez pics are very useful for troubleshooting your amp. Don't wait to be asked. JUST DO IT!

Offline dwinstonwood

  • Level 3
  • ***
  • Posts: 1217
  • I love Tube amps
Hoffman Amps Forum image
Re: 6G3 Capacitor Question
« Reply #190 on: July 12, 2020, 08:22:44 pm »
I would never try to poke two 18AWG wires into the lugs on a nine pin socket. 22AWG only for me.

I’ve already gathered up some solid 22ga wire.  :icon_biggrin:
When I bought that green 18ga wire I didn’t know how heavy it would be. Just trying to bend it seems like it would snap off a socket lug.

Tubes and cap pan are ordered!

Offline dwinstonwood

  • Level 3
  • ***
  • Posts: 1217
  • I love Tube amps
Hoffman Amps Forum image
Re: 6G3 Capacitor Question
« Reply #191 on: July 12, 2020, 09:19:52 pm »
One final thought before cashing in...

I wonder if those power connections on the upper-left corner of the board were put there by Fender as a place for the amp assemblers to check voltages during final checkout (after the cap pans were attached). I guess it also serves as a place to anchor long runs of wire, too. :dontknow:

Offline sluckey

  • Level 5
  • *******
  • Posts: 5075
    • Sluckey Amps
Hoffman Amps Forum image
Re: 6G3 Capacitor Question
« Reply #192 on: July 12, 2020, 10:28:48 pm »
I've always wondered what that white stuff in bird poop is.   :think1:  :dontknow:
A schematic, layout, and hi-rez pics are very useful for troubleshooting your amp. Don't wait to be asked. JUST DO IT!

Offline PRR

  • Level 5
  • *******
  • Posts: 17082
  • Maine USA
Hoffman Amps Forum image
Re: 6G3 Capacitor Question
« Reply #193 on: July 12, 2020, 10:54:16 pm »
> what that white stuff in bird poop is

You don't want to know.

Offline DummyLoad

  • SMG
  • Level 5
  • *****
  • Posts: 5791
Hoffman Amps Forum image
Re: 6G3 Capacitor Question
« Reply #194 on: July 13, 2020, 05:20:34 am »
I've always wondered what that white stuff in bird poop is.   :think1: :dontknow:


it's bird pee - uric acid in paste form. we had a west african gray parrot, had many Qs about that and other things.

bird took too many chunks of skin. funny as all get-out when you were getting hammered or baked with him around. i miss that bird, he was dad's pet.

back on topic: any pics of the work done so far on this amp?

--pete

Online bmccowan

  • Level 3
  • ***
  • Posts: 1744
  • Better builder than player
Hoffman Amps Forum image
Re: 6G3 Capacitor Question
« Reply #195 on: July 13, 2020, 06:22:41 am »
Quote
back on topic

Not so fast. African Grays are a riot. Smart birds. Good friends of mine had one. Sidney talked up a storm and was a wiseguy. They also had a cat and Sidney would waddle over to the door and repeat "wanna go out" a few times. The cat would come to the door and Sid would waddle away laughing loudly. He also remembered derogatory names he heard individuals called, and when one particular band member arrived for a cookout or for practice he'd always shout out "Hi Dipshit." He loved to entertain.
On topic - he did post a couple pics of the board and chassis.
Mac
“To my surprise, when I opened my eyes, I was the victim of a great compromise.”
John Prine

Offline dwinstonwood

  • Level 3
  • ***
  • Posts: 1217
  • I love Tube amps
Hoffman Amps Forum image
Re: 6G3 Capacitor Question
« Reply #196 on: July 13, 2020, 07:57:31 am »

back on topic: any pics of the work done so far on this amp?

--pete

Between full-time work and other commitments it's taking longer than I hoped.
And, I overlook things like not inserting the wires into the eyelets before soldering up the components.
So, redoing things wastes a lot of time. :icon_biggrin:

Offline dwinstonwood

  • Level 3
  • ***
  • Posts: 1217
  • I love Tube amps
Hoffman Amps Forum image
Re: 6G3 Capacitor Question
« Reply #197 on: July 13, 2020, 10:09:51 am »
As for wasting time...
Another complete beginner mistake led to over an hour of fierce fighting with the inputs. I attached the buss wire too low on the pots and it got in the way of the 68K grid stoppers. I had to remove the resistors and rewire them. :BangHead:

It's ugly, I know (and, maybe I could have put the resistors directly on the tube sockets), but they're well insulated with no bare wires to rub against the chassis or ground buss.

Offline dwinstonwood

  • Level 3
  • ***
  • Posts: 1217
  • I love Tube amps
Hoffman Amps Forum image
Re: 6G3 Capacitor Question
« Reply #198 on: July 13, 2020, 05:00:09 pm »
More progress. Just about ready to mount the main board.

Online bmccowan

  • Level 3
  • ***
  • Posts: 1744
  • Better builder than player
Hoffman Amps Forum image
Re: 6G3 Capacitor Question
« Reply #199 on: July 13, 2020, 06:44:57 pm »
Its fine - we've all installed things that turned out to be in the way of something else. Law of unintended consequences. A lot of folks mount those grid stoppers right on the tube sockets - my ears hear no difference.
And if I can offer some advice - do not worry about being slow - enjoy the process. When you finish it, and have it sounding great, you will immediately start thinking about your next amp project anyways. Its like when you return from a great vacation trip and immediately start searching the Web for your next one. We all do that: don't we?
Mac
“To my surprise, when I opened my eyes, I was the victim of a great compromise.”
John Prine

 


Choose a link from the
Hoffman Amplifiers parts catalog
Mobile Device
Catalog Link
Yard Sale
Discontinued
Misc. Hardware
What's New Board Building
 Parts
Amp trim
Handles
Lamps
Diodes
Hoffman Turret
 Boards
Channel
Switching
Resistors Fender Eyelet
 Boards
Screws/Nuts
Washers
Jacks/Plugs
Connectors
Misc Eyelet
Boards
Tools
Capacitors Custom Boards
Tubes
Valves
Pots
Knobs
Fuses/Cords Chassis
Tube
Sockets
Switches Wire
Cable


Handy Links
Tube Amp Library
Tube Amp
Schematics library
Design a custom Eyelet or
Turret Board
DIY Layout Creator
File analyzer program
DIY Layout Creator
File library
Transformer Wiring
Diagrams
Hoffmanamps
Facebook page
Hoffman Amplifiers
Discount Program