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  1. nice.glad you solved it.

    nice.glad you solved it.
  2. if it redplates your switches are working. ...

    if it redplates your switches are working.
    disclaimer- these amps have voltages that can kill you.if you are not experienced and qualified I do not recommend you servicing this amp.

    red plating...
  3. thanks for responding.looking at the schematic-...

    thanks for responding.looking at the schematic- T3 is across the positive terminals of the 50uf cap.the circuit leaves T3 then ties into the 470ohm screens, the 50uf cap and a 10k resistor that feeds...
  4. 48732

    48732
  5. 48731

    48731
  6. 1990 marshall reissue jtm45 mkii blown ht fuse

    (3)12ax7 (2)6L6 GZ34. original condition. head only
    the owner is an old friend.got this from a guitar player that used power soak devices. 6L6 version. first visit- shorted section of 50uf 600v B+...
  7. the unit was unloaded-nothing plugged into it...

    the unit was unloaded-nothing plugged into it AFTER I replaced the fuse and powered up which resulted in another blown fuse.opened unit.no burns or burned odor.no shorted regulators or diodes.no...
  8. yankee ps-m2 pedal board supply failure

    looking for anyone that has knowledge of or experienced failure in one of these yankee ps-m2 units.this one was bought new. used it 4 months. circumstances were that it was well kept,used in dry...
  9. sorry this post took so long.i did solve it....

    sorry this post took so long.i did solve it. faulty off/on and standby switch.thanks
  10. Fender Hotrod Deville crackling at turn on

    Boy these things are a mess. In addition to the laundry list of items to correct like- plate resistors,power recap,broken solder joints,broken ribbon connectors,bad relays,faulty jacks etc...this guy...
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    solved! faulty 7815a regulator.

    solved! faulty 7815a regulator.
  12. Replies
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    I haven't received the part yet but yes there was...

    I haven't received the part yet but yes there was evidence of heat at the middle pin of 7815a.no crust just a little tan discoloration from heat.I'll get back to you once I get the part in.I did test...
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    still waiting on part.supply side is +/- 26vdc...

    still waiting on part.supply side is +/- 26vdc respectively or each regulator.7915 is right on the money.7815 is shorted.trust me.
  14. Replies
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    Peavey XR684F mixer repair issues

    units lights flicker when turned on then go out.cooling fan stays on.audio is heard when signal applied to power amp in jacks.
    after checking regulator voltages per enzo recommendation, found 7815A...
  15. Replies
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    enzo-sorry man I am lousy at this forum stuff....

    enzo-sorry man I am lousy at this forum stuff. when I last posted the administrator info said I didn't have permission to start a new thread. found the issue.of course you were right on it.3vdc at...
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    hi folks.new to the thread.anyone hear ever...

    hi folks.new to the thread.anyone hear ever experience this XR684F act like this; at turn on - fan begins to run immediately power light flickers but does not stay on.it's as if the unit is on but no...
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    kasino fever amp issue

    amp is back.different issue. input stage transistors Q1 & Q2 with 8vdc on all legs.???
  18. Replies
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    yes the 725 did the trick.pre board now operating...

    yes the 725 did the trick.pre board now operating fine.power amp output stage looks good too. thanks for the tip. now... here's the $64,000 question. what caused the IC 14228 to fail?
  19. Replies
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    not to hi jack the thread but a quick question if...

    not to hi jack the thread but a quick question if I may...on PC5102 my signal dies right after pin 8 of IC I1B. nothing on the other side of c22 and r30 which ties to pin 133 c 26 and c28.I suspect...
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    musicman 112 65 rd

    hi man.I know this is old, 2007, but I don't get on the page enough.since you helped me out with some great info on that crate I thought I'd ask about this music man 112 65 rd G2A(6L6) solid state...
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    reflow-reflow-reflow.also,check every screw on...

    reflow-reflow-reflow.also,check every screw on the circuit board.they all ground to chassis.be sure to use threadlock. anyone ever seen one of these with a selectable voltage switch in the rear below...
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    just read in another forum,warning not to use...

    just read in another forum,warning not to use tung sols in cathode follower stage.that they would fry. many post recommend 12at7 for V1-V2-V3. any thoughts on this?
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    my customer had replaced his pre amp tubes with...

    my customer had replaced his pre amp tubes with chinese tung sol 12ax7's. I'm wondering if their quality control has gotten that bad.a friend of mine that works at the music store that sold them says...
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    o.k. fellas. have a good laugh.I deserve it. just...

    o.k. fellas. have a good laugh.I deserve it. just reminded myself of a long forgotten lesson.never,ever under any circumstance, allow the customer to figure into the diagnosis of a tube amp because...
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    Fender hot rod deluxe loud hum issue

    Well here we go...had one of these hot rod dogs on the bench last year.same problem.went through all of the usual fixes,re-cap power supply,rectifier diodes,tubes,reflow joints,check all grounding...
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    sorry I never got back to you on this one but you...

    sorry I never got back to you on this one but you were right on the solder joints... Q14 had broken foil trace & C31 was faulty.
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    sure.if you pull V1 or V2 hum is gone. I have a...

    sure.if you pull V1 or V2 hum is gone. I have a laundry list of options to try so after I get back on it tomorrow I'll let you guys know what I have found.
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    Well here we go...had one of these hot rod dogs...

    Well here we go...had one of these hot rod dogs on the bench last year.same problem.went through all of the usual fixes,re-cap power supply,rectifier diodes,tubes,reflow joints,check all grounding...
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