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  1. sdn25

    EVH 5150 iii EL34 50w volume keeps changing slowly while playing.

    Hmm, haven’t yet tried that. I’ve tried jumping the loop using a patch cable so far to no avail. Is the test gonna determine if the loop circuitry is at fault? Or is it to determine if the pre amp section is to blame?
  2. sdn25

    EVH 5150 iii EL34 50w volume keeps changing slowly while playing.

    Update: it’s 5am and I turned the amp on, the issue came back (on the new socket). I had it checked out by a tech who said he found no fault with it. He play tested and did a measure of the amp output for 2 hours. He said nothing out of the ordinary. Quite puzzling I must say. Is it possible...
  3. sdn25

    EVH 5150 iii EL34 50w volume keeps changing slowly while playing.

    Honestly I have no clue, just moved recently and don’t have a meter on hand. It’s a fairly new (2017 built) dorm room. Nope there’s only 2 chargers and a pedalboard supply connected. The new socket I tried is on a different wall.
  4. sdn25

    EVH 5150 iii EL34 50w volume keeps changing slowly while playing.

    Thanks for the suggestions guys, after trying all the methods listed, turns out there’s nothing wrong with the amp. I moved it to another wall socket and the issue doesn’t occur anymore - not sure why but that’s the case for now. I even took it to a tech who said he measured a constant 50w...
  5. sdn25

    EVH 5150 iii EL34 50w volume keeps changing slowly while playing.

    Picked up a used 5150iii el34 head recently and it has an issue where as you keep playing, the volume slowly but surely swells up and down. Happens on all channels. As the volume changes, the timbre of the sound does not, purely volume. I have checked all pre amp tubes with good ones, the...
  6. sdn25

    I may have achieved the most accurate VH1 brown sound on youtube...

    Glad you think it sounds good! What do you suggest I title it to to not make it seem like clickbait?
  7. sdn25

    I may have achieved the most accurate VH1 brown sound on youtube...

    I just uploaded a video covering aint talkin love and I think I managed to get the most accurate tone for on VH1. I'd say I'm about 95% there. You be the judge and let me know your thoughts and even A/B it to the real song. Would love to hear your opinions! video:
    • sdn25
    • Thread
    • brown sound evh van halen vh1
    • Replies: 2
    • Forum: The Cellar
  8. sdn25

    What's your poison? What kind of effects do you use with your Marshall/s?

    I use the effect knows as the guitar cable…:cool: Jokes aside just a simple mxr 10 band eq used as a buffer Into a tce flashback and phase 90 script.
  9. sdn25

    (Solved)50w JMP clone sounding woofy and broken up all of a sudden

    Update: Amp is back to normal now. Seems like the broken grid stopper was causing the problem. No more weird standby noise and no more woofy tone. Thanks for all the suggestions guys 🤘
  10. sdn25

    (Solved)50w JMP clone sounding woofy and broken up all of a sudden

    Just finished the voltage survey. PFA the image with voltages. Let me know if anything looks out of place.
  11. sdn25

    (Solved)50w JMP clone sounding woofy and broken up all of a sudden

    Another update: I just decided to probe some of the coupling caps and are they supposed to have 180-190VDC on them? The 0.022 and 0.0022 coupler all have 180 VDC on them
  12. sdn25

    (Solved)50w JMP clone sounding woofy and broken up all of a sudden

    Update, while probing the tubes for voltages, the 5k6 grid stopper just broke off and the tube started to redplate; I promptly turned the amp off. The break felt easy which would mean the joint was weak in the first place. Would a bad grid stopper connection cause the issues I had?
  13. sdn25

    (Solved)50w JMP clone sounding woofy and broken up all of a sudden

    Yep power tubes were the first thing swapped out. I will check out the article and try their troubleshooting methods and report back. Might just be a bad solder joint as I had recently swapped out my v2b cap from 330uF to 0.68uF
  14. sdn25

    (Solved)50w JMP clone sounding woofy and broken up all of a sudden

    The amp is about a year old. About 2-3 months after building it I replaced the stock mains and screens filter caps to F&T 50+50 caps but the can cap on the board is still stock. I wouldn't guess the F&Ts would fail but would a failing filter cap cause that noise you heard in the clip?
  15. sdn25

    (Solved)50w JMP clone sounding woofy and broken up all of a sudden

    the sockets are clean now. Problem still persists. Is that whooshing sound when the standby gets turned off a clue to determine what the issue could be?
  16. sdn25

    (Solved)50w JMP clone sounding woofy and broken up all of a sudden

    okay so i changed all the pre amp tubes but the issue still persists.
  17. sdn25

    (Solved)50w JMP clone sounding woofy and broken up all of a sudden

    Right, I tried different output tubes but no change. Since the problem gets worse as the amp heats up, is it likely a pre amp tube or the leaky capacitor as Matthew suggested?
  18. sdn25

    (Solved)50w JMP clone sounding woofy and broken up all of a sudden

    Reseating the tubes did not change the sound. BTW did you mean to swap the positions of the tubes or just reseat them? Because I just reseated the tubes in the same position. The presence knob did change the brightness of the signal but the rest of the controls didn't seem to do anything. Yes...
  19. sdn25

    (Solved)50w JMP clone sounding woofy and broken up all of a sudden

    The amp in question is my ceriatone plexi 50. While playing, all of a sudden the sound just went dark and woofy and started to break up (not in a good way). I have no clue as to what it could be, but the audio clip I attached may hopefully be of help. The first weird sound you will hear in the...
  20. sdn25

    How do you increase headroom in a 50w JMP?

    Hey guys I think im almost there in terms of what I set out to achieve. Im positive I don't need to spend money on this now. I just installed a 250k volume pot in my guitar as opposed to a 500k and think the resonant peak of the guitar signal has changed or something because the low mids are...

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