Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Toxophilite on December 21, 2017, 06:52:49 pm

Title: Can you bypass the reverb and extra gainstage on a deluxe reverb?
Post by: Toxophilite on December 21, 2017, 06:52:49 pm

Is it possible , via a switch to bypass the reverb and extra gain stage on a deluxe reverb? essentially switching it a straight deluxe

Title: Re: Can you bypass the reverb and extra gainstage on a deluxe reverb?
Post by: sluckey on December 21, 2017, 07:02:21 pm

Sure.

Title: Re: Can you bypass the reverb and extra gainstage on a deluxe reverb?
Post by: Toxophilite on December 21, 2017, 07:50:37 pm

Cool! Thanks. I might play around with that idea as I remember one of my first non reverb deluxe builds being a really nice sounding amp.

Title: Re: Can you bypass the reverb and extra gainstage on a deluxe reverb?
Post by: sluckey on December 21, 2017, 08:26:24 pm

I'm working on a schematic but I'll have to finish tomorrow morning when I'm fresh.

Title: Re: Can you bypass the reverb and extra gainstage on a deluxe reverb?
Post by: Toxophilite on December 21, 2017, 11:20:33 pm

Wow! Very appreciated. It's a one channel deluxe reverb build
I guess one would need a double throw switch, probably interrupting after the blocking caps after the second gain stage and the gain stage after the reverb (before the PI) Maybe a push pull switch on the actual reverb pot.

Title: Re: Can you bypass the reverb and extra gainstage on a deluxe reverb?
Post by: Toxophilite on December 22, 2017, 03:11:18 am

like this maybe?
Quick rough
(I just noticed that this schematic might be missing a 220K resistor to ground just before the PI)

double throw switch - blue
preamp side - red lines
PI side - green lines

Title: Re: Can you bypass the reverb and extra gainstage on a deluxe reverb?
Post by: sluckey on December 22, 2017, 06:15:36 am

That should work.

So, you don't have an opto-coupler (roach) type tremolo circuit like a real AB763?

Title: Re: Can you bypass the reverb and extra gainstage on a deluxe reverb?
Post by: Toxophilite on December 22, 2017, 10:48:49 am

No
This is one of my builds and I've been using the bias vary
However a fellow was telling me it's easy to make an opto-coupler

Title: Re: Can you bypass the reverb and extra gainstage on a deluxe reverb?
Post by: 2deaf on December 22, 2017, 07:05:25 pm

Attached is a variation on your theme.

There are some errors on your schematic that you will probably notice when you actually build the amp.

Title: Re: Can you bypass the reverb and extra gainstage on a deluxe reverb?
Post by: Toxophilite on December 24, 2017, 03:54:39 pm

Thanks. I appreciate that
This amp is built(as well as a few others), however there are likely errors in my schematic , as well some things have been purposefully changed.