Lord I forgot how long it takes to build a Hoffman Deluxe Reverb

[jojokeo]

discussion goes from worry & dilemma of a bright cap and schematic inconsistencies (trivial) to not using the proper PT or even knowing anything about the PT you're using or at least testing it first? 

[bnwitt]

Oh please.  Not my fault Mojo keeps using the same 779 PT transformer designation for different iterances of a transformer made for the same amp.  I wired it up according to the current diagram.  And because I do know what I'm doing and know how to start up an amp, the PT and everything else still has the magic smoke in it.  And I suppose asking a simple question about the missing bright cap on a layout is worry and dilemma?  Puh-lese.  And now I find that there are at least 4 versions of the 779 not just the 3 shown on Doug's page.  What's a sparky to do? and since I'm not really a guitar player per se I count on others who are to tell me whether or not the bright cap is needed on a particular amp with different guitars.  I'm just trying to please the players of my amps.  Not trivial to me.

[jojokeo]

You can point blame away and not take responsibility for a ten year old part if you like? But as "experienced" builders know it's always a good idea to even check/test for mis-marked or mis-labeled parts like caps and resistors right? Why waste time on a trivial part like a PT?

[Ed_Chambley]

It still sounds fishy that the orange has 2.0vac.  With the amp off, check to see if you have continuity between the orange and shield.  I did see one of the versions with the orange being a 100v primary, but it cannot be this.


However, I have used a 2 volt for radio tubes in little builds, but this would never be a PT for anything else.  If everything is working, it is working.  I am just courious because if the transformer has a shield it generally has a ground wire.


Joe is being Jimbob today.

[bnwitt]

You can point blame away and not take responsibility for a ten year old part if you like? But as "experienced" builders know it's always a good idea to even check/test for mis-marked or mis-labeled parts like caps and resistors right? Why waste time on a trivial part like a PT?

You know what, a PT is not trivial.  It is a big part of the cost of an amp  I have several more of these European version PTs that I purchased way back when I was cranking out amps in the early to late 90s. Unfortunately they don't all still have their little folded wiring diagram rubber banded around the body as the rubber band has long rotted away and my shop is a bit of a mess at the moment.  An "experienced builder" considers these to be NOS and high quality and they are all American made not some Taiwanese crap.  I've built close to a hundred amps for sale so I guess I'm experienced wouldn't you say?  How many have you built?  And for crying out loud, it was in the process of checking this PT during start up that I discovered it was putting out way too much HT voltage.  Then I started attempting to verify the primary winding configuration before doing anything else and once I did, I rewired it and tested it again.  Now all is working just fine.  So what are you saying I did wrong?  You know what?  Never mind.  I don't need to hear your explanation.  I know what I'm doing and I don't need accusatory posts such as yours in my day.

[bnwitt]

It still sounds fishy that the orange has 2.0vac.  With the amp off, check to see if you have continuity between the orange and shield.  I did see one of the versions with the orange being a 100v primary, but it cannot be this.


However, I have used a 2 volt for radio tubes in little builds, but this would never be a PT for anything else.  If everything is working, it is working.  I am just courious because if the transformer has a shield it generally has a ground wire.


Joe is being Jimbob today.

Ed,
The PT does not have a visible external copper Faraday shield but I received a response from MOJO saying the Orange Wire "might" be the shield ground as well.  I have the PT wired up like the version 3 MOJO 779 without the Orange wire terminated and the amp is fine.  No noise, no buzz nothing wrong and all voltages are good.  I may try grounding the Orange wire and see what happens.

[bnwitt]

So for anyone who is interested in seeing the documentation on this Hoffman 2 channel AB763 I've attached a PDF file for review.

[sluckey]

I may try grounding the Orange wire and see what happens.

It's probable that the orange wire is a shield and should be connected to ground. Sometimes when a PT wire is left unterminated it will pick up some stray voltage but as soon as you ground it the voltage disappears.

Do this... Check for any resistance between the orange wire and any other PT wire. I bet there is no resistance reading. Then check for any resistance reading between that orange wire and any part of the PT shell or laminations. I'm thinking there will be a reading.

[bnwitt]

Will do Steve

[jojokeo]

   It took Steve to tell you to check continuity to ground 1st?! The "experienced one" was going to do it and "see what happens"? Holy moly - this is what  your kind of "experience" gets you?


Didn't you say in an earlier post that you wired up the tranny according to the hook-up diagram? Something is amiss either with your recollection or maybe prideful dishonesty?

[bnwitt]

Ok no continuity from the orange wire to any other wire but none to the end bells either.  I'd have to pull the PT and then the end bells to find out where the wire goes.   I'll  just ground it and see if there is any change in the noise floor which will be hard to hear since the amp is pretty quiet on idle already.

[bnwitt]

You no Joe, you can kiss my a$#  you don't have a clue what you are talking about.  This will be my last response to any of your future posts as you are a complete jerk.

[jojokeo]

You no Joe, you can kiss my a$#  you don't have a clue what you are talking about.  This will be my last response to any of your future posts as you are a complete jerk.

Feeling's mutual 👍 Have a great day and good luck, you certainly need all you can get.

[sluckey]

Both of you knock it off. Hoffman's forum is better than that.

[jojokeo]

Yes, you are right Steve. Asking questions got to a dark place there didn't it? My sincere apologies forum brothers.

[PRR]

> My sincere apologies forum brothers.

Thank you. I thought you had sat on a bee.

[bnwitt]

You know Steve I'm  not sure what I'm suppose to knock off.  I'm in here discussing an amp and some joker personally attacks me.  Reread the thread from start to finish why don't  you?  I think I'll just check out of here again.  You guys enjoy your Joker.

[jojokeo]

You know Steve I'm  not sure what I'm suppose to knock off.  I'm in here discussing an amp and some joker personally attacks me.  Reread the thread from start to finish why don't  you?  I think I'll just check out of here again.  You guys enjoy your Joker.

Who you calling a joker dimwit or is it halfwitt? Couldn't leave things alone could you child? I've been biting my tongue and merely asking questions exposing your lack of building sense and myopic hubris and you say it's attacking you? And the trivial transformer comment (obvious sarcasm) went right over your head earlier too. No surprise there either.


No, you actually exposed yourself here. I don't need to recite my decades of experience to prove anything, especially in attempt to prove some sort of validation to a post in a weak attempt to make myself sound more correct. That's weak and pathetic. It's like so many actors or athletes that get arrested then fire back to the police, "you can't arrest me! Don't you know who I am!?"


It's readily apparent your experience hasn't served you well at all. In many ways. Just because a person has experience doesn't automatically determine that it's a good thing or that it's even a positive? Such as repeating the same mistakes over and over. And in your case it's plainly obvious to see.


Now go back home and cry to your mommy and tell her all about your bad day that started out as a whiny thread you made about how you forgot (despite building 100 amps as you say?) how it's taken such a long and challenging time for you to build your deluxe reverb paint by numbers clone and you just can't figure out what to do with your orange crayon?! Puh-lease!