FDP Forum / Blues Deluxe, OD channel not working/ 8 messages in thread.

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SecondHoneymoon

Contributing Member
*********

Columbia, SC

Jan 8th, 2017 05:48 PM        

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        

So even if the drive and master controls are turned up full, only a bit of signal is getting through?<br /> 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.



willie

Contributing Member
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Too Near Atlanta GA

Amp Tech Emeritus
Jan 12th, 2017 07:36 AM        

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



guitarcapo



U.S.A.

Jan 12th, 2017 09:59 AM        

Another cause sometimes is just plain dirty pots.<br /> <br /> At least it was on my Blues Deluxe back in the day.



SecondHoneymoon

Contributing Member
*********

Columbia, SC

Jan 12th, 2017 02:34 PM        

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.<br /> <br /> 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        

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        

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.<br /> <br /> I will post whenever I get this fixed.



Hammond101

Contributing Member
**********

So. Cal. USA

Jan 13th, 2017 04:02 PM        

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.



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