Two Rock Classic Reverb, Reverb EQ Switch possible for AB763 circuits?
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Two Rock Classic Reverb, Reverb EQ Switch possible for AB763 circuits?
Hi! The older TR Classic Reverbs had a switch that let you tailor the Reverb return EQ. It had three positions dark/mellow/bright. I really liked this feature and would love to apply it to my recent AB763 Amps (Vibroverb, Deluxe Reverb). Do you have an idea how to do this? Thanks a lot!
- martin manning
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- Joined: Sun Jul 06, 2008 12:43 am
- Location: 39°06' N 84°30' W
Re: Two Rock Classic Reverb, Reverb EQ Switch possible for AB763 circuits?
Reverb tone control has been done by placing a Tweed Deluxe-type one-knob tone control on the reverb recover stage output. You could do that, and substitute an on-on-on switch and two or three resistors for the pot.
Re: Two Rock Classic Reverb, Reverb EQ Switch possible for AB763 circuits?
Or perhaps a few capacitors similarly switched setting the filter frequency and a pot to adjust the depth.martin manning wrote: ↑Sun Dec 31, 2017 4:07 pm Reverb tone control has been done by placing a Tweed Deluxe-type one-knob tone control on the reverb recover stage output. You could do that, and substitute an on-on-on switch and two or three resistors for the pot.
Best .. Ian
Re: Two Rock Classic Reverb, Reverb EQ Switch possible for AB763 circuits?
thanks! if anyone did this, coud you post some pictures?
- martin manning
- Posts: 13287
- Joined: Sun Jul 06, 2008 12:43 am
- Location: 39°06' N 84°30' W
Re: Two Rock Classic Reverb, Reverb EQ Switch possible for AB763 circuits?
The version using a pot has been done, and it works fine. Here's how I'd do it using a switch.
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Re: Two Rock Classic Reverb, Reverb EQ Switch possible for AB763 circuits?
very cool, many thanks!!
Re: Two Rock Classic Reverb, Reverb EQ Switch possible for AB763 circuits?
i peeked inside my classic reverb, but it‘s hard to see how they did it, pretty crowded!
- martin manning
- Posts: 13287
- Joined: Sun Jul 06, 2008 12:43 am
- Location: 39°06' N 84°30' W
Re: Two Rock Classic Reverb, Reverb EQ Switch possible for AB763 circuits?
In the TR photos, which switch is the reverb tone? For your AB763, I'd wire up the tweed tone control with a 1M pot, and maybe try a couple of different cap values as well. Then you could select preferred resistor and cap values for a switched solution.
Re: Two Rock Classic Reverb, Reverb EQ Switch possible for AB763 circuits?
Another suggestion.
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- martin manning
- Posts: 13287
- Joined: Sun Jul 06, 2008 12:43 am
- Location: 39°06' N 84°30' W
Re: Two Rock Classic Reverb, Reverb EQ Switch possible for AB763 circuits?
That's actually the same suggestion (Tweed Deluxe tone control, with the volume pot flipped around the right way). I just replaced the pot with a three-position switch above.
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