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    Well, I have all of these, maybe I will do a...

    Well, I have all of these, maybe I will do a little experiment. Doh, out of Everclear :)
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    I have access to 91% isopropyl, Everclear, or...

    I have access to 91% isopropyl, Everclear, or denatured.


    No Cramolin here, but I wonder if the freon worked better as a propellant than whatever they have now. Wonder if I got some old stock...
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    Thinning Deoxit D100

    Having gotten frustrated by Deoxit D5 spray cans running out of charge before I have used half the can, I ordered some D100 and it has the brush tip. I would like to be able to thin it a bit, maybe...
  4. I don't think that looks homemade, except the...

    I don't think that looks homemade, except the box. Trying to figure out what kind of organ or pedal steel thingy it could have been in.
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    So if AC goes away when you unplug the preamp, do...

    So if AC goes away when you unplug the preamp, do you see any AC at the Line Out? Maybe also look at make sure the Output pot hasn't gone open, I have had amps oscillate with an open master volume....
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    Someone had given me a non-working Evo 300 a...

    Someone had given me a non-working Evo 300 a while back with rail to rail AC oscillation. My poor little bench speaker didn't even know what hit it :( I wish I could tell you how to fix it, but I...
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    I have a similar era HR Deville and had no sound...

    I have a similar era HR Deville and had no sound either from preamp or poweramp. What I found was that pads on the V2 and PI tubes had broken from the PCB trace. They looked fine, but they were not...
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    Don't know if this is a good or terrible idea,...

    Don't know if this is a good or terrible idea, but could this be converted to a hybrid bias by putting a cathode resistor in place? Seems like it wouldn't need to be too big to get a bit of positive...
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    How far negative can that supply even go? That is...

    How far negative can that supply even go? That is a voltage doubler after the rectifier, correct? With a 15VAC transformer it seems to me like it may be struggling to get to -47V, but doublers are...
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    Thanks, just checking. They look really fragile...

    Thanks, just checking. They look really fragile so it makes me curious if they are different than most pots. Just being paranoid I guess. You would be too if everyone was after you. ;)
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    GK 250ML cleaning trim pots

    Sorry for dumb question, but can you use regular electrical cleaner on trim pots (like you would on panel pots), or ar they more like faders? I am trying to adjust the gain and volume on this GK250ML...
  12. When you turn up/down the level knob or the...

    When you turn up/down the level knob or the change the EQ switch does it change the hiss from the speaker at all? If you connect the xlr out to another speaker or mixer do you get strong signal out?
  13. Hi Muzz, welcome to the Forum! The simplest...

    Hi Muzz, welcome to the Forum!

    The simplest problem that might cause what you are describing is dirty effects loop jacks. If you run a guitar cable from the Send jack into the Return jack this...
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    Thanks for the replies. I am definitely going to...

    Thanks for the replies. I am definitely going to cut out the section and epoxy in some perf board. That will give me a place to mount those couple components and give the board some strength.
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    What to do with this burned board

    Hot Rod Deluxe that someone kept pumping fuses into. Amp is mine now so I can do whatever I want with it. It looks to me like the burn material goes pretty much all the way through, so I assume I am...
  16. It is about matching impedances. With four tubes...

    It is about matching impedances. With four tubes you have output impedances in parallel, so the output impedance is cut in half relative to two tubes. If you start with four tubes and remove two you...
  17. Of course removing the fuse isolates the sockets,...

    Of course removing the fuse isolates the sockets, my lack of attention there.

    So the standby switch is before the rectifier on this? That seems weird. You mentioned bringing it up on a variac with...
  18. Half the tubes you should double the speaker ohms...

    Half the tubes you should double the speaker ohms relative to the OT tap, so either keep the same speaker load and go to the next lower ohm tap, or double the speaker ohms.

    Arc'ing tube socket?
  19. Based on this I would look at the V2 tube solder...

    Based on this I would look at the V2 tube solder joints and pads.
  20. As I said in the other thread, I would check...

    As I said in the other thread, I would check continuity to the tube pins, specifically V1 and V2 since your PI and power tubes seem to be working since it works well at the power amp in.

    Another...
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    SunDog, it would probably be good to start a new...

    SunDog, it would probably be good to start a new thread for this so as not to cause confusion, but I have a Deville that I just fixed with very similar problem. It ended up being some PCB pads at the...
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    Well, it does say "Preliminary" across the top,...

    Well, it does say "Preliminary" across the top, and it is a legacy brand so Fender usually just says "this is what we were given."
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    This got me thinking about the silkscreen value...

    This got me thinking about the silkscreen value of those resistors. On R36 you can see it in the picture as 180. I can't see which is R38 or what the value is. But then I noticed that R36 was a...
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    Since this circuit seems to be stumping everyone,...

    Since this circuit seems to be stumping everyone, let me throw out two alternate theories.

    1.) in the first post the OP says he is concerned the transistors put in may be counterfeit. I think it...
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    I know you said you replaced Q6 but now it looks...

    I know you said you replaced Q6 but now it looks like current is flowing in reverse (out of the emitter) back towards Q7. This may explain where the current going into the base is going, but seems...
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    If you can I would do direct measurements of Vbe...

    If you can I would do direct measurements of Vbe values on Q8 and Q5, since the consensus is that there isn't enough current flowing there. Especially if the voltages are varying I think it is useful...
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    I'm guessing he meant Q6 base of the OPs amp, not...

    I'm guessing he meant Q6 base of the OPs amp, not Q8.
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    Rather than saying Q8 isn't pulling enough...

    Rather than saying Q8 isn't pulling enough current could it be that Q5 is not allowing it to have enough? Since Q5 is replaced by a substitute part and there is a note about changing the value of R27...
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