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  1. C25 is ok, no leakage. After cleaning all TAG...

    C25 is ok, no leakage. After cleaning all TAG wire connectors, input jack voltage dropped to 0.041V B and 0.002V T, but all of my Guitars‘ volume pots still create some scratchies, while all the...
  2. What do you think, remove C25 completely or...

    What do you think, remove C25 completely or bridge it? At the moment jack voltage increased to 0.420 V (T) and 0.890V (B). This amp suxxxx....
  3. Meanwhile I removed some of the orange goop...

    Meanwhile I removed some of the orange goop supposed to fix the filter caps on pcb. This reduced the input jack voltage to 0.098V (T) and 0.210 (B). This goop apparently causes some leakage...
  4. Thanks Helmholtz, B: 1.87V, T: 1.6V, FB1: 0.7R,...

    Thanks Helmholtz, B: 1.87V, T: 1.6V, FB1: 0.7R, switching contacts are clean & working. I‘m not quite sure how to check FB1.
  5. Thanks Mick, with input tube removed the voltage...

    Thanks Mick, with input tube removed the voltage rises/swings between 0.8 and 1.4 Volts DC.
  6. VOX Night Train 15 NT15 DC Voltage at input jack

    Hi, I got 0,48 Volts DC at a VOX Night Train 15 NT15´s input jack causing severe scratchy noises from any guitarˋs volume pot.
    Changing tubes and cleaning the jack didn’t help. So what to do next?...
  7. Thatˋs a good idea, I use a TungSol RI 12AU7 as...

    Thatˋs a good idea, I use a TungSol RI 12AU7 as reverb driver V3 in my ˋ67 Deluxe Reverb for a better overall sound in the Vibro Channel and an excellent and subtle reverb tone.
    Zouto
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    This double plug on pot construction also picks...

    This double plug on pot construction also picks up some hum. It blocks the FX loop completely so you can‘t use any FX in the loop. With the box you can use FX like digital delays etc. before the...
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    Sure, I‘d like to use the box without any hum.

    Sure, I‘d like to use the box without any hum.
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    Hi Enzo, thanks for chiming in. Yes, the wiper is...

    Hi Enzo, thanks for chiming in. Yes, the wiper is grounded when the pot is turned down, the complete metal housing of the box has ground continuity. The box picks up hum from the PT like a single...
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    Itˋs an Alpha 100K A pot, the box hums even with...

    Itˋs an Alpha 100K A pot, the box hums even with the pot turned off completely.
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    Yes, here we are:

    Yes, here we are:
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    Checking the box on two different HRDXs I got the...

    Checking the box on two different HRDXs I got the same olˋ hum on both of ˋem. Moving it to different positions on top of the amps I could find a hum-free spot. Obviously the hum is induced by the...
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    No, I have no other amp with an FX loop, but I‘ll...

    No, I have no other amp with an FX loop, but I‘ll check the box on a friendˋs HRDX tomorrow. I‘m eager to hear what will happen....
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    Yes, nothing plugged in and all controls at 0....

    Yes, nothing plugged in and all controls at 0. Turning on volume and tone pots just add a little hiss etc. without any change in overall hum from volume box near PT.
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    Yes, the complete housing is connected to the...

    Yes, the complete housing is connected to the jacksˋ ground, 0,7 Ohms. I tried four or five different high end cables like Vovox, George L, SommerCable etc., I got that hum with all of ˋem.
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    Thanks. I checked all the boxesˋ ground...

    Thanks. I checked all the boxesˋ ground connections with my trusty Fluke 87 V DMM:
    input jackˋs to output jackˋs ground 0,7 Ohms, both to boxesˋ surface 0,7 Ohms, 100K A potˋs grounding lug to...
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    Patching send and return jacks with a standard...

    Patching send and return jacks with a standard guitar cable works fine without any hum/noise. Moving the aluminum box to different positions on top of the amp induces more or less hum, depending on...
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    I replaced the output jack with an isolated ReAn...

    I replaced the output jack with an isolated ReAn plastic model with just a signal connection, but no connection to the ground of the metal box. The result was a much louder hum like an open ground....
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    Thanks Enzo, exactly this happened, there was no...

    Thanks Enzo, exactly this happened, there was no way of stopping it. Is there a way to combine both threads?
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    Yes it is, by the jacks‘ threads, nuts and...

    Yes it is, by the jacks‘ threads, nuts and washers, the pot´s ground lug is connected to the input jack´s ground. Meanwhile I found out, that a short patch cable to „PWR Amp In“ reduces the hum...
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    Volume Box for HRDX humming

    Hi, I just built a Volume Box for a Fender Hotrod Dx as described here http://stinkfoot.se/archives/2159, using a small diecast enclosure.
    Plugged into the amp´s fx loop, it works but with an...
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    Volume Box for HRDX hum

    Hi, I just built a Volume Box for a Fender Hotrod Dx as described here http://stinkfoot.se/archives/2159, using a small diecast enclosure.
    Plugged into the amp´s fx loop, it works but with an...
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    Randall, Thanks for the link, Mogami is really...

    Randall,
    Thanks for the link, Mogami is really useful in SF Fenders.
    Zouto
  25. What about F&T caps? They are really good and...

    What about F&T caps? They are really good and reliable in long time operation, I used them over the years in many Fender, Marshall..etc. Amps....
  26. Thread: EPK pcb troubles

    by Zouto
    Replies
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    456

    Problems solved, after a short time I finally got...

    Problems solved, after a short time I finally got an answer, rechecked pcb and wiring, replaced a bad cable, the circuit is working fine now. The pcb was ok, internally broken ribbon cable was the...
  27. Thread: EPK pcb troubles

    by Zouto
    Replies
    2
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    456

    EPK pcb troubles

    Hi, I got some EPK pcbs I ordered from their site https://effectpedalkits.com
    Checking the pcbs I fould out that they are faulty, missing continuity between several soldering pads, e.g. no...
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    VHT Pitbull 45 troubles

    On my bench is a broken VHT Pitbull 45 with blown filter caps, one slightly smoked 1watts resistor, no signal and no schematics. The amp has two double sided pcbs, which are absolutely hard to...
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