Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Travis8 on August 02, 2023, 12:30:34 pm

Title: Big problem with deluxe reverb 65
Post by: Travis8 on August 02, 2023, 12:30:34 pm: Hi,

I´m trying to fix a deluxe reverb, the issue is that turn up the reverb make a lot of hiss, the hiss only come down when I disconnect the reverb tank..

some ideas?
Title: Re: Big problem with deluxe reverb 65
Post by: Travis8 on August 02, 2023, 12:39:12 pm: Is the TAD 4AB3C1B new one..
Title: Re: Big problem with deluxe reverb 65
Post by: Travis8 on August 02, 2023, 12:53:49 pm: Also If I remove V4 noise dissapear and If I remove v3 noise still there.
Title: Re: Big problem with deluxe reverb 65
Post by: Travis8 on August 02, 2023, 12:57:42 pm: I try with a new V4 and the noise continue.

the noise here: https://drive.google.com/file/d/1Tyx-001ATqgZxwEcXtoSo04p8hshFqnC/view?usp=drive_link
Title: Re: Big problem with deluxe reverb 65
Post by: PRR on August 02, 2023, 01:04:24 pm: > deluxe reverb 65

Probably the 1993 Reissue?
https://robrobinette.com/images/Guitar/Deluxe_Models/65_Deluxe_Reverb_RI_Manual.pdf
Title: Re: Big problem with deluxe reverb 65
Post by: Travis8 on August 02, 2023, 01:06:30 pm: Quote from: PRR on August 02, 2023, 01:04:24 pm
> deluxe reverb 65

Probably the 1993 Reissue?
https://robrobinette.com/images/Guitar/Deluxe_Models/65_Deluxe_Reverb_RI_Manual.pdf

Serial number: AC 075690
Title: Re: Big problem with deluxe reverb 65
Post by: Travis8 on August 02, 2023, 01:17:13 pm: could be RCA cables?

The tank is very new, I think is correct.
Title: Re: Big problem with deluxe reverb 65
Post by: sluckey on August 02, 2023, 01:30:16 pm: Why was the tank replaced?
Title: Re: Big problem with deluxe reverb 65
Post by: Travis8 on August 02, 2023, 01:33:06 pm: Quote from: sluckey on August 02, 2023, 01:30:16 pm
Why was the tank replaced?

Becouse old one doesnt sound and the tremolo doesnt sound too.

Now works but with this noise
Title: Re: Big problem with deluxe reverb 65
Post by: sluckey on August 02, 2023, 01:36:25 pm: Try another cable set. OK to borrow from your sound system.

BTW, tremolo issue is likely not related to reverb issue.
Title: Re: Big problem with deluxe reverb 65
Post by: Travis8 on August 02, 2023, 01:38:28 pm: Quote from: sluckey on August 02, 2023, 01:36:25 pm
Try another cable set. OK to borrow from your sound system.

BTW, tremolo issue is likely not related to reverb issue.

Ok, i will try another cables..

Yes, I know tremolo must be another think but I didnt found it yet... tubes are new
Title: Re: Big problem with deluxe reverb 65
Post by: Dave on August 02, 2023, 01:42:33 pm: Also try a snubber cap on the return from the reverb tank like Fender used in the 70's. That's what that cap was there for.

Dave
Title: Re: Big problem with deluxe reverb 65
Post by: Travis8 on August 02, 2023, 01:47:16 pm: Ok, tremolo was bad footswitch now is working
Title: Re: Big problem with deluxe reverb 65
Post by: Travis8 on August 02, 2023, 01:48:09 pm: Quote from: Dave on August 02, 2023, 01:42:33 pm
Also try a snubber cap on the return from the reverb tank like Fender used in the 70's. That's what that cap was there for.

Dave

ok, never see it. I will investigate
Title: Re: Big problem with deluxe reverb 65
Post by: sluckey on August 02, 2023, 02:01:41 pm: 2000pF is the same as .002µF. If cables and/or this cap don't fix this issue you need another tank. It seems like I see lots of issues with new tanks these days.
Title: Re: Big problem with deluxe reverb 65
Post by: Travis8 on August 03, 2023, 04:14:33 am: Quote from: sluckey on August 02, 2023, 02:01:41 pm
2000pF is the same as .002µF. If cables and/or this cap don't fix this issue you need another tank. It seems like I see lots of issues with new tanks these days.

Ok, I order one good RCA shielded cable to try it, the two 12AT7 are this one "TAD ECC81/12AT7-Cz" could be problematic this tube for reverb?
Title: Re: Big problem with deluxe reverb 65
Post by: Latole on August 03, 2023, 06:19:56 am: First of all, can you confirm that this amp has already worked perfectly? No hiss?

Secondly, has this amp ever been repaired by another person ?

And finally, show us a good photo of the circuit. I suspect somes wires are misplaced.