SVK-22, slightly modified Fender Vibro King

[DummyLoad]

EDIT: My caps are gonna be bigger than what you have pictured so I'm gonna squeeze real estate down so I can then stretch it out to 13" (ish) and have room for Orange drops, (etc)

Really! You will quickly find out how unfriendly my layouts are to ODs or other big caps.   

May I suggest Xicons? The caps on my drawings are scaled properly. Look at these two big ole ODs...

Doug's aluminum drilling blank has an oddball spacing, something like 29/64" IIRC. There's a story about the origins of that old relic somewhere on this website.

I really like the tone of Panasonic ECQ series caps. Give them a try as alternative to Xicon parts.

IIRC, but wasn't the drill pattern for Doug's original drill template spacing Metric based?

--Pete

[sluckey]

Origins of Doug's aluminum drilling blank...

     https://el34world.com/Forum/index.php?topic=28346.0

[SILVERGUN]

I really like the tone of Panasonic ECQ series caps. Give them a try as alternative to Xicon parts.

Thanks, I needed that. The Xicons are becoming scarce. I had a bunch of the Panasonics in my shopping cart but was on the fence. You pushed me over.
Now I can blame you if the amp sounds like s%!#

[DummyLoad]

I really like the tone of Panasonic ECQ series caps. Give them a try as alternative to Xicon parts.

Thanks, I needed that. The Xicons are becoming scarce. I had a bunch of the Panasonics in my shopping cart but was on the fence. You pushed me over.
Now I can blame you if the amp sounds like s%!#

There are no excuses for bad taste! You must be a strat player? 

--Pete

[jojokeo]

There are no excuses for bad taste! You must be a strat player? 

--Pete

LOL Pete, that made me think of old forum member.


SG, you are a real glutton for punishment using that skinny little chassis. Hopefully it doesn't rattle w/ the back panel like some I've encountered? I like this idea and almost forgot to check in on it. I have a friend's Hot Rod Deluxe sitting around that's been waiting for something like this to come along? It could be a real hit in the man cave studio packed with Marshalls?

[SILVERGUN]

Yeah jojo, I'm having fun over here with this chassis. 
I'll hope to post something of just the amp this time. I realize my demo'ing skills haven't proven to be the best.

I will start a thread for my version of this soon...

[SILVERGUN]

Brother Steve, I have one more issue to report.
The coupling cap after the first gain stage in the wet circuit is .0022 on the schematic, but 0.022 on the layout. It looks like .0022 on the original schemo, so of course I went with .0047 
I don't know how I missed that with the highlighter but I caught it when I was laying out parts for my board.

[sluckey]

.0022 is the correct value. Layout fixed. THX

[SILVERGUN]

Brought the carcass into work today to give it the old high pressure air blowout before installing the board this weekend.
Snapped a teaser pic for all you amp porn addicts out there.

[sluckey]

I hope you trimmed the width of that board.

[SILVERGUN]

I hope you trimmed the width of that board.

Oh yeah.
My board don't look like your board, but if you look close enough, it's 90% your layout.


All holes are drilled, standoffs installed and I've had it in out a few times whilst sizing things up.
Wiring the terminals to the sockets is gonna be like puitting spark plugs in a Prius

[DummyLoad]

Well??? Where's our Amp porn SG!?

[shooter]

he's slow-rollin this one, wants all the wires in the correct spot, wants to make it pretty

[SILVERGUN]

Well??? Where's our Amp porn SG!?

he's slow-rollin this one, wants all the wires in the correct spot, wants to make it pretty

I prefer the slow reveal. This one aint so pretty, but I like it. I ain't gonna win any "build of the year" awards with that attitude.
Wires going to the right places? ...yes, there is that.
I was getting near the finish line and actually ran out of input jacks. 
Pulled the bin and much to my surprise it was filled with 11's and no 12a's. I don't know how that happened, but I'll just blame it on Jimbo being a jinx.
A couple more wires going to the right places and it will be Michelob time.

[sluckey]

I used to love Michelob back when they had that cool vase shaped bottle. Great for holding your favorite incense sticks.

But now it's Ultra, just another lite beer. I want the real stuff. And the cool bottle!   

[SILVERGUN]

I used to love Michelob back when they had that cool vase shaped bottle.

Yeah, we uusta haveta mow a few extra lawns to get "the good stuff"
When you saw those bottles up on the RR tracks you knew someone had a "fancy" party or they were tryin to get the gurlz to come up.
Everything sux now. They have sucked the greatness out of just about everything from bottles to Baywatch.


Tubes are all we have left.

[shooter]

Tubes are all we have left

welcome to the 21st century. 


the Analog world still exists, sorta, in a dystopian, demonized sorta way.

[Lectroid]

My wife likes to say that they've stolen our culture and are selling it back to us.

[shooter]

When you saw those bottles up on the RR tracks you knew

we drank manly beer in el norte' 
Stand outside Hoffman's Liquor store with a $5 bill sticking out of your palm, make eye contact, ask for 2 40's of Shildt's (sp?), a blend somewhere between Guiness Extra-stout and diesel fuel.   

[bmccowan]

Dawson, Rheingold, and Nastygansett - 5 long necks in a drawstring plastic bag for a buck-5. Amazing what I remember from college. When we had the extra dough, we sprang for Ballantine XXX, or maybe even Black Horse Ale. Michelob was just Buttwiper with a little less rice in the mix.

[SILVERGUN]

40's of Shildt's (sp?),

It"s Schlitz.
That's what started people leaving the paper bag over the 40.... so that other people wouldn't know what crappy brand you were drinking, out on the corner.
I mean, I never did that but I knew a guy...he talked to the bus when it went by

[AlNewman]

Tubes are all we have left

welcome to the 21st century. 


the Analog world still exists, sorta, in a dystopian, demonized sorta way.

It's good to keep prepared.  Our digital lifestyle is dependent on tinfoil revolving around the earth at 20 miles above sea level and 10 times the speed of sound.  And it's a junkyard up there.  The world may need tubes again.

[W5FH]

Silvergun-
    I am very interested in your build here of this version. Have been following and studying this thread. Last night saw a band from Michigan, the Sea Cruisers, playing here in East Texas. One of the guitarists was plaing through a blonde VibroKing 3x10. Very interested in this circuit. Thanks!

[dwinstonwood]

This is big sluckey. Thanks for this contribution!

I'm sort of thinking it would be nice to build it as a complete preamp with reverb and trem, but no power amp.

[sluckey]

Silvergun, can you give us an update on your Vibro King project?

[SILVERGUN]

It's still front and center on my bench about 97% complete.

This amazing coincidence happened:
Right around the time the cost of lumber came down and the temps weren't winter-like, all 3 of my friends remembered what a big help I am.
Built a 12x16 shed with homegrown trusses on a concrete slab (shoveled out, then stones, then poured), helped out on a huge deck project, and built the young lady of the house her very own boardwalk where some busted up concrete used to be. (of course I had to finish busting up the concrete and get rid of it).
Then pre-spring hit and the motorcycle to-do list was longer than ever - did a clutch, new front springs, master cylinders, stainless lines, carb rebuilds, tires.

Tweaked my back throwin packs of shingles and I've been hunched over since. Can't imagine being hunched over a workbench trying to squeeze the last 3% together. I did say it would be the 2023 project, so there is still plenty of time.

Excuses, excuses....
If Jimbo apologizes for his behavior I'll finish it up and do a little "Man on the Silver Mountain" just for him

[shooter]

all 3 of my friends

me, myself, n I ? 
those are my best friends, although they do cause some trouble every now n then

[sluckey]

Hey Silvergun. Haven't heard from you since June. Still around? Any progress on the Vibro King?

[SILVERGUN]

The good news is, I'm still above ground. This amp has been stalled on my bench since we last spoke. Life got in the way. The plan is still to finish it in time for 2023 Amp Build of the Year voting. I haven't been watching close enough to see if I have any competition.
So close, so close and yet so far...

[tubeswell]

... to finish it in time for 2023 Amp Build of the Year voting. ...

Looks like it'll get a vote from me

[shooter]

stalled here also, dropping out early so there's no pressure.  Tubeswell's vote can count twice to keep in-line with normal voting practices of late 

[tubeswell]

...Tubeswell's vote can count twice to keep in-line with normal voting practices of late 

Either that or I'll just vote twice

[BrainDeadAmps]

Love the idea of a VibroKing.

compared to a 6g15 circuit the mix control is much more complex, why the change/added components?

[sluckey]

Love the idea of a VibroKing.

compared to a 6g15 circuit the mix control is much more complex, why the change/added components?

I was just copying the VibroKing, not the 6G15.

[BrainDeadAmps]

Love the idea of a VibroKing.

compared to a 6g15 circuit the mix control is much more complex, why the change/added components?

I was just copying the VibroKing, not the 6G15.

This has inspired me to build a SE amp head with a 6g15 up front like the vibroking. I like the idea of a recording amp and outboard reverb in one.  Even though I’m using the 6g15 circuit, I’ve been going over their differences and I don’t know enough to really tell what benefit all the extra components are providing.

[bxershrts]

Thanks for sharing this build and all the time that went in to creating it. Very exciting circuit to build!

I built this SVK22 and it sounds really good. I love the no feedback as the grit is smooth and grind up nicely.

The reverb circuit is really something else.

I have a question regarding the vibrato. I dont have a left 250K and will just use it backwards until one arrives.
The tremonator circuit i built works kind of..and I am looking for some help with clues to track down the issues.

With the knob all the way clockwise with the normal direction pot and as I turn the intensity CC the signal gets quieter, as if its really loading down or not being amplifed(recovered) With the pot all the way CC the trem circuit works, the speed works and as I turn the footswitch on and off the volume of the guitars signal comes back . AS i enguage the circuit it loads down and becomes much quieter - yet still works.

I have traced the layout and gone back to the schematic a million times. Replaced the pot, replaced the tube, replaced the VTL5C1 and it does the same thing. There is continuity throughout the circuit yet I still cant make it work without loosing so much output signal when engaged.

Any thoughts on something I have over looked...

I can provide a picture if needed.

Thank for your help :-)

[ac427v]

I had the same problem with the Tremonator on a Plexi circuit.

I disconnected the Intensity Pot from ground and it worked perfectly.
That is because the original Tremonator intensity pot replaced the existing 50k ground load on the AB763 circuit. When used with a different circuit, the ground connection needs to happen by sending signal through the VTL5C1 only. The Intensity pot functions as a variable resistor controlling how much signal goes to ground with each trem pulse.
Easy change for you to try.

[bxershrts]

Thank you very much for your reply! Quick and fast :-)

I disconnected the ground lug and flipped over the wires to work clock wise.

With your explanation making total sense, and full of excitement to try this out, it is with no luck that I report.

Great explanation though, with the wires flipped and no ground lug attached there is better control ----and in the right direction..still such a drop in volume happening ...still looking for ideas and suggestions

[ac427v]

Sorry my idea did not fix it
You could try to contact Bieworm. He may have tweaked the circuit on his successful build of the SVK-22.
Your wiring is a thing of beauty. That is truly wonderful work!

[bxershrts]

Thank you for kind words and suggested options to try. Ungrounding the pot did affect things in a positive way, albeit marginally - it is still an important suggestion. As it will undoubtedly be the wisdom someone else building this design will need.