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FDP Forum / Amp Mods, Repairs, and Projects / Blues Deluxe Reissue Again.

frogman
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Pueblo, Co

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Sep 13th, 2019 11:44 AM   Edit   Profile  

Never actually had this thing fixed but the caps have all been replaced along with the tubes. I created a short video that hopefully one of you guys can get an idea of what might be happening.

Hopefully I uploaded the video correctly to my YT channel.

BDRI sound

Leftee
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VA

Sep 13th, 2019 02:39 PM   Edit   Profile  

Could it be a sympathetic vibration?

Try plugging the amp into a different speaker. See if the problem follows or goes away.

frogman
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Sep 13th, 2019 04:11 PM   Edit   Profile  

I forgot to mention that I have also had three different speakers in it, I put a cannabis rex in it and because nothing changed I put the stock one back in.

I will figure out the wiring and send the output to a Vox amp



Leftee
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VA

Sep 13th, 2019 04:32 PM   Edit   Profile  

Yeah, I would try that. Or, somehow, isolate the amp from the cab/speaker.

Does it do it at low volume?

Peegoo
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If irritation occurs

discontinue use.
Sep 13th, 2019 05:29 PM   Edit   Profile  

Sounds like it may be intermodulation caused by the power supply. That "octave" effect I'm hearing there sure sounds like it.

Any time an amp makes ghost notes like that on all frequencies, it's usually caused by the the power supply. If it were just one or a few frequencies, I'd suspect something else like loose cabinet hardware, a loose component in a power tube, etc.

You said the caps were all replaced; I wonder if one of the caps in the power supply is either the wrong rating--or perhaps it's not in spec.

Peegoo
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If irritation occurs

discontinue use.
Sep 13th, 2019 05:31 PM   Edit   Profile  

I'm going to assume it does this with other guitars besides that Love Rock.

Sometimes if a neck pickup on a guitar is too close to the strings, it can create this effect.

frogman
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Sep 13th, 2019 05:50 PM   Edit   Profile  

Peegoo, all my guitars sound that way at any volume. The guy I really trust (trusted) plugged a bass guitar into it and cranked up the overdrive to show me good it was working.. Made me pee my pants.

Sadly I did not bring a guitar with me to show him what the problem was and he is an hour drive away.

He tapped one of the new tubes and found it made a noise so he deduced that that was the problem all along, he put in some NOS tubes (preamp ones). Just so sick of it. I want to sell it but think it better to have it working before I do that.



Peegoo
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If irritation occurs

discontinue use.
Sep 13th, 2019 09:14 PM   Edit   Profile  

Yeah, you're right to fix it before unloading it, unless you can sell it to someone that's familiar with these sorts of issues and can do the fix themselves.

Leftee
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VA

Sep 14th, 2019 07:44 AM   Edit   Profile  

I wasn’t sure about ghost notes because it sounds too “in tune” for that. That said, it could be a mild case for sure.

Ghost note example

(This message was last edited by Leftee at 09:45 AM, Sep 14th, 2019)

frogman
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Sep 14th, 2019 01:24 PM   Edit   Profile  

Leftee, that is appalling! This very helpful, I will take a trip and meet with the tech and ask him to check stuff.

Leftee
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VA

Sep 14th, 2019 01:30 PM   Edit   Profile  

The above-case is rather egregious and extreme.

Some older Marshalls were under-filtered and ghosted a bit when cranked.

DrGonz78

United States Phx,AZ

Sep 16th, 2019 05:43 AM   Edit   Profile  

Not sure if your amp has negative feedback loop. If it does then test the amp with it disconnected. Any difference?

frogman
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Sep 16th, 2019 12:38 PM   Edit   Profile  

"Not sure if your amp has negative feedback loop. If it does then test the amp with it disconnected. Any difference?"

No idea what that is, I have an effects loop, channel 1 and 2 inputs and that is it.

DrGonz78

United States Phx,AZ

Sep 18th, 2019 04:48 AM   Edit   Profile  

There is a wire, think it's gray colored, that connects the output secondary back into the phase inverter. It creates a negative feedback loop into the output of the circuit. Since you are bypassing the preamp by plugging into effects return then we know the issue lies some where between phase inverter and the onward. If there is an oscillation occurring causing the problem then removing the negative feedback loop may make it go away. If it doesn't go away then at least we have ruled it out of potential issues that it could be.

FDP Forum / Amp Mods, Repairs, and Projects / Blues Deluxe Reissue Again.




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