Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Misc Schematics and Layouts => Topic started by: BetterOffShred on December 22, 2016, 12:43:28 pm

Title: "The Twin" (red knob one) Schematic ?
Post by: BetterOffShred on December 22, 2016, 12:43:28 pm

Hey does anyone have a fairly high quality copy of a schematic for the 87-94 (I believe)  "The Twin" amp?   I am doing some research on it to see if it's worth buying one and I'd like to see what's happening inside.   I have a pretty crappy one I found but it's low resolution and not really much of a help.   I was hoping someone had a real high quality re-draw of it maybe like some of the other things I've seen around here! 

Overall the amp kind of looks like a nightmare electronically.. but you can get them pretty cheap.  And I just want a loud 2x12 to blast with fuzz and OD boxes anyway!
Thanks

-Brett

Title: Re: "The Twin" (red knob one) Schematic ?
Post by: sluckey on December 22, 2016, 01:03:02 pm

There's a good schematic in Hoffman's schematics library.

Title: Re: "The Twin" (red knob one) Schematic ?
Post by: BetterOffShred on December 22, 2016, 01:12:25 pm

Yeah that's the one I have already.  Thanks though for pointing that out!

-Brett

Title: Re: "The Twin" (red knob one) Schematic ?
Post by: sluckey on December 22, 2016, 02:31:37 pm

Quote

I am doing some research on it to see if it's worth buying one and I'd like to see what's happening inside.

It looks kinda typical of most the older Fender schematics I've seen, but there is a ***LOT*** of stuff on that schematic. Still, it's legible enough to use for troubleshooting or evaluation. I bet even Fender doesn't have a 'better' schematic. That's not a popular amp. I've never seen a nice redraw.

Title: Re: "The Twin" (red knob one) Schematic ?
Post by: BetterOffShred on December 22, 2016, 02:42:49 pm

Yeah. I agree, not very popular!  25w/100w switching and footswitchable overdrive are cool, but maybe they just ruined the magic of the twin to create this stuff.   It's not popular enough to try and go out and play one around here.  Worst case scenario I could build a Hoffman board and throw it in the chassis, and have some leftover switch holes I guess.   Thanks for looking :)

-Brett

Title: Re: "The Twin" (red knob one) Schematic ?
Post by: tubenit on December 27, 2016, 07:59:25 pm

Robben Ford reportedly has used the Red Knob Twin to perform on quite a few occasions (per the guys on the Amp Garage).  I think it could be converted into a Dumble amp pretty easily using the trannies.

with respect, Tubenit

Title: Re: "The Twin" (red knob one) Schematic ?
Post by: WiderGates on December 29, 2016, 03:01:25 pm

Here's a better one:

Title: Re: "The Twin" (red knob one) Schematic ?
Post by: BetterOffShred on December 29, 2016, 03:27:26 pm

Hey that _IS_ a little clearer! Thanks man!  I appreciate that
-Brett