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Hoffman Amps Forum image Author Topic: Removing the tremolo circuit from a Deluxe Reverb  (Read 4903 times)

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Offline fingersoccer

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Removing the tremolo circuit from a Deluxe Reverb
« on: May 17, 2016, 03:09:57 pm »

I'm going to build a Deluxe Reverb from scratch, but I'd like to leave out the tremolo. The tremolo circuit is easy enough to identify and pull out of the schematic, but I want to make sure I'm not accidentally removing some crucial bit of the bias circuit in the process. I looked at the Blackface Bassman schematic (since it doesn't have tremolo) and came up with what you see here. It looks right to me, but I could use some wise eyes on this to double check.

I found a useful thread on the (DIY Audio Forum), but the images links are broken, rendering it a bit less than helpful.


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Offline sluckey

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Re: Removing the tremolo circuit from a Deluxe Reverb
« Reply #1 on: May 17, 2016, 04:06:33 pm »
Looks good. Your R20 should be 47Ω for a Deluxe Reverb using an 8Ω speaker. R40 and R41 should be 10K.
« Last Edit: May 17, 2016, 06:04:56 pm by sluckey »
A schematic, layout, and hi-rez pics are very useful for troubleshooting your amp. Don't wait to be asked. JUST DO IT!

Offline Shack

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Re: Removing the tremolo circuit from a Deluxe Reverb
« Reply #2 on: May 17, 2016, 04:52:53 pm »
How do you see that lol.....what would be the difference if the 100 ohm was left there?
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Offline sluckey

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Re: Removing the tremolo circuit from a Deluxe Reverb
« Reply #3 on: May 17, 2016, 05:15:01 pm »
How do you see that lol.....what would be the difference if the 100 ohm was left there?
I see it by looking at a DR AB763 schematic. NFB would be stronger using a 100Ω. Probably not hear much difference. That's just how Leo did it. All his AB763 amps that connected to an 8Ω speaker load used a 47Ω resistor in that position. The amps that had a 4Ω or 2Ω speaker load used a 100Ω resistor.
A schematic, layout, and hi-rez pics are very useful for troubleshooting your amp. Don't wait to be asked. JUST DO IT!

Offline fingersoccer

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Re: Removing the tremolo circuit from a Deluxe Reverb
« Reply #4 on: May 17, 2016, 06:15:49 pm »
sluckey: The values for R20, R40, and R41 were all pulled from the Hoffman 1ch Deluxe Reverb build. Do you think those values should be replaced with the original Fender values?
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Offline fingersoccer

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Re: Removing the tremolo circuit from a Deluxe Reverb
« Reply #5 on: May 17, 2016, 06:17:41 pm »
Oh look, I found another thread with a very similar objective: http://el34world.com/Forum/index.php?topic=18882.0
And evermore in the world is this marvelous balance of beauty and disgust, magnificence and rats.

Offline sluckey

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Re: Removing the tremolo circuit from a Deluxe Reverb
« Reply #6 on: May 17, 2016, 06:36:25 pm »
sluckey: The values for R20, R40, and R41 were all pulled from the Hoffman 1ch Deluxe Reverb build. Do you think those values should be replaced with the original Fender values?
That is Hoffman's AB763 amp. It's not specifically a Deluxe Reverb. Hoffman shows Deluxe Reverb specific values in this file...

     http://el34world.com/Hoffman/files/Hoffman_AB763_2.pdf
A schematic, layout, and hi-rez pics are very useful for troubleshooting your amp. Don't wait to be asked. JUST DO IT!

 


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