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FDP Forum / Amp Mods, Repairs, and Projects / Blues Deluxe, OD channel not working

SecondHoneymoon
Contributing Member
*********

Columbia, SC

Jan 8th, 2017 05:48 PM   Edit   Profile   Print Topic   Search Topic

My clean channel sounds great, but my OD suddenly has almost zero volume. Any suggestions on what i should check?

pdf64

UK

Jan 12th, 2017 06:06 AM   Edit   Profile   Print Topic   Search Topic

So even if the drive and master controls are turned up full, only a bit of signal is getting through?
If so it may be that the switching mute circuit has failed somehow. Lifting one leg of CR1 may help if that's the case.

BDlx schematic

willie
Contributing Member
*******

Too Near Atlanta GA

Amp Tech Emeritus
Jan 12th, 2017 07:36 AM   Edit   Profile   Print Topic   Search Topic

True...the issue is most likely caused by Q1, the JFET J111, they are quite commonly a cause of this type of failure.

willie

guitarcapo

U.S.A.

Jan 12th, 2017 09:59 AM   Edit   Profile   Print Topic   Search Topic

Another cause sometimes is just plain dirty pots.

At least it was on my Blues Deluxe back in the day.

SecondHoneymoon
Contributing Member
*********

Columbia, SC

Jan 12th, 2017 02:34 PM   Edit   Profile   Print Topic   Search Topic

The pots are dirty, but I don't think that's the issue. Yes, when drive and master volume are turned all the way up, hardly any sound is coming out. Clean channel works fine.

I'll probably take it to be repaired. Changing tubes is one thing. Opening it up is a whole nother matter. Thanks for the suggestions!

Coral Head

Sunshine State

Groupies needed
Jan 13th, 2017 09:20 AM   Edit   Profile   Print Topic   Search Topic

My Blues Deluxe just started cutting out sporadically and the red light for the OD channel blinks although I am playing on the clean. Same thing?

SecondHoneymoon
Contributing Member
*********

Columbia, SC

Jan 13th, 2017 01:33 PM   Edit   Profile   Print Topic   Search Topic

Coral, that doesn't sound like what mines doing. I think the light is on, although I'm using the foot switch so I can't be sure. Channel isn't cutting in and out. Just barely audible sounds coming out. I don't use this amp much, so it's been idle until I plugged it in and found this problem.

I will post whenever I get this fixed.

Hammond101
Contributing Member
**********

So. Cal. USA

Jan 13th, 2017 04:02 PM   Edit   Profile   Print Topic   Search Topic

Coral, Sounds like the switch for the drive channel or the relay that it controls on your BD. There are test points shown in the schematic for troubleshooting this.

FDP Forum / Amp Mods, Repairs, and Projects / Blues Deluxe, OD channel not working




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