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  1. Replies
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    87

    I had one of these SL3242FX that drove me...

    I had one of these SL3242FX that drove me bonkers.
    The Right channel would drop out.
    I could duplicate it by pushing gently on the front panel.

    The Mute All Channels circuit was the cause of the...
  2. That is it.

    That is it.
  3. "but no one here seems to confirm the image i...

    "but no one here seems to confirm the image i posted about that coupling cap emplacement on the schematic."

    Maybe it's me, but the 'image' is just an icon with no image behind it.:)
  4. You MUST install a 'coupling capacitor' between...

    You MUST install a 'coupling capacitor' between R6 & pin #3 of the opamp.

    Without it, pin #3 sits at whatever dc voltage is coming through R6.

    The capacitor will block the dc voltage but allow...
  5. Quote:" "SS" ... i dont find anything on google...

    Quote:" "SS" ... i dont find anything on google with ss tube vca... could you link pls?"

    The statement that Mr Fayey made used the initials 'SS'.
    That implied the term "Solid State".
    As opposed...
  6. Are there FX loop Send/ Return jacks? Try...

    Are there FX loop Send/ Return jacks?

    Try running a patch cord between them.
  7. Replies
    7
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    219

    Quote": I have a scope and sig gen" Drive the...

    Quote": I have a scope and sig gen"

    Drive the amp to full signal power. (100Mv input/ 1k)

    Measure the output tube grid voltage (Vac)

    A 100 watt amp should see 90 Vac at the grids (at least)....
  8. Safety First! Nice demo. But what a bunch...

    Safety First!

    Nice demo.

    But what a bunch of idiots.

    No eye protection or face shield.
  9. Replies
    14
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    342

    12 volts at 100 amps! Can you say 'welder'?

    12 volts at 100 amps!

    Can you say 'welder'?
  10. Quote:"About the harshness he says: "The solution...

    Quote:"About the harshness he says: "The solution was with the power amp section. A 330pf capacitor across the 47K negative feedback (NFB) resistor marked R12 in the service schematic"

    But it...
  11. Replies
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    116

    I noticed the ground connection was missing on my...

    I noticed the ground connection was missing on my drawing of the PNP transistor.

    54251
  12. Replies
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    2,235

    R 112:...

    R 112: https://www.ebay.com/p/1-Ohm-30a-Power-NTC-Thermistor-Surge-Current-Limiting-SCK301R0-X1pcs/1752945068
    R 213: http://www.datasheetcafe.com/ntc-10d20-datasheet-ntc-thermistor/
  13. Replies
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    415

    Agree on a probable socket issue. If the grid...

    Agree on a probable socket issue.

    If the grid pins (pin #2) are knackered you would loose the bias & red plate the output tube.
    Or a slight conductive short between the cathode (pin #3) & the...
  14. Replies
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    372

    So what is the Crate Model#?

    So what is the Crate Model#?
  15. Replies
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    674

    I would get the slide switch....

    I would get the slide switch.
    https://www.digikey.com/product-detail/en/c-k/V80212SS05Q/CKC3002-ND/181459

    54244
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    4,190

    This is about all the 'user manual' you will...

    This is about all the 'user manual' you will find: http://www.voxshowroom.com/uk/amp/v125.html

    Not much to it other than a multi band eq.
  17. Replies
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    116

    Dean Markely RM80-DR

    I have an RM 80 on the bench that someone tried to repair.

    Hoo Boy!

    Anyway, the only schematic out there is not what I have in front of me.
    There is a strange two transistor circuit hanging...
  18. I am not sure if there even IS an MG50FX...

    I am not sure if there even IS an MG50FX schematic.
    If there is, it has never surfaced.

    If the front end is anything like the MG15-30 FX, there is a bunch of DSP, atmeg microcontroller stuff...
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    415

    "Please post schem. " 54231

    "Please post schem. "

    54231
  20. Mike Soldano did a pretty decent design on this...

    Mike Soldano did a pretty decent design on this amplifier.

    Unfortunately, the Chinese manufacturers got a hold of it.:(

    I had one of these in for a signal dropping out issue.
    It was the head...
  21. Replies
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    109

    Man, what a convoluted circuit. Tone control...

    Man, what a convoluted circuit.
    Tone control meets the reverb return.:(

    Raising the reverb control full on should be a higher resistance to ground signal wise than when it is turned down.
    (10K +...
  22. Replies
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    319

    That is a really old switch type. There is a...

    That is a really old switch type.

    There is a cam inside the switch enclosure that briefly actuates the microswitch contacts.
  23. Replies
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    392

    Hot Cat 30 schematic for those reading along at...

    Hot Cat 30 schematic for those reading along at home.:)

    54217
  24. Replies
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    125

    All that I can find on the Fat 1 is a block...

    All that I can find on the Fat 1 is a block diagram: https://www.manualslib.com/manual/1379753/Tl-Audio-Fatman-Fat-1.html?page=4#manual

    Have you attempted to contact Presonus about the D8?...
  25. What specific 'mod' are you looking for? Try...

    What specific 'mod' are you looking for?

    Try the HC Jet City JCA20H page: https://www.harmonycentral.com/forum/forum/guitar/acapella-28/1376468-
  26. I wouldn't classify it as a "cataclysmic events"...

    I wouldn't classify it as a "cataclysmic events" but I do remember back about 15 years ago an earthquake hit the Reading, PA area.
    We where playing on the second of a three floor building and it...
  27. https://www.mouser.com/productdetail/alpha-taiwan/...

    https://www.mouser.com/productdetail/alpha-taiwan/sr1712f-0204-20f0a-n9-n-027?qs=8%252br4Hz5Xir8jgfyVwPHVzQ%3D%3D
  28. I have seen that on Marshall amps. Some kind...

    I have seen that on Marshall amps.

    Some kind of reverse protection chassis reference.
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