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  1. While we know in advance Mesa would tag a large...

    While we know in advance Mesa would tag a large handling fee and shpg fee on the parts, they no doubt DO have the part in their inventory. Have you contacted them, just for fun, to see what the...
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    I assume the line that's common to the unused Pin...

    I assume the line that's common to the unused Pin 6's of the two KT66 power tubes go to a power supply tap on the PCB, probably after a choke where one would usually find the screens being fed from. ...
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    I think at that point, I too would have thrown in...

    I think at that point, I too would have thrown in the towel and shelved it. I had to give up on a Crest CA-9 a couple years ago that kept failing, and finally had to call it quits. Some repairs...
  4. When the component leads are long enough, you can...

    When the component leads are long enough, you can re-install the components elevated above the board. Easier to do when the parts are new, as you can create a 'dimple' in the lead to keep the part...
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    I've never actually checked the MosFET's in the...

    I've never actually checked the MosFET's in the one Nemesis NC320 I have in the shop. Now, in servicing Ampeg SVT3-Pros thru SVT6-Pro amps, those are all closely matched at the factory, and I've...
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    Uh...........I haven't looked recently, having...

    Uh...........I haven't looked recently, having maybe 1/3 of a bottle left. Has it hit the endangered species list due to the Pandemic?
  7. Welcome to the Forum! If you don't get results...

    Welcome to the Forum!

    If you don't get results from going thru the tube PCB assy and repairing any suspect solder joints on components or tube sockets, I'd plug in a cable into the Power Amp input...
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    Eden WT800 Service Notes 2013-2019

    I went thru my files and extracted all of the Service Notes on the Eden WT800 I had from Aug 2013 thru Nov 2019. Both in MS Word and PDF. I haven't reviewed all of them, just did a quick compiling...
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    This is all I have....BA112a.....Schematic and...

    This is all I have....BA112a.....Schematic and PCB Parts Placement Guide/Parts List:

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    Could be lead corrosion on R25 6.8k/2W which...

    Could be lead corrosion on R25 6.8k/2W which feeds D3 & Q11. Maybe C11 is defective. I think you said you had replaced C10, though I'd have to dig back thru the dialog on the earlier posts. I've...
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    OH.....I missed this thread. Sorry. I didn't...

    OH.....I missed this thread. Sorry. I didn't see what the supply voltages are. We still have the DC imbalance on the front end circuit. Without the supply voltages, I can't calculate the branch...
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    I feel your frustration. I don't believe we've...

    I feel your frustration. I don't believe we've seen -15V on D3 before, though that's no doubt the zener voltage plus DC offset. But, you've kind of revealed where the problem isn't.....the output...
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    I've never seen the insides of one of these, so I...

    I've never seen the insides of one of these, so I don't know the form factor (Toroid, UI-style flat-pack xfmr, etc), but, looking thru their user manual, a few things are noted: Universal Primary,...
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    Nah.....nothing wrong here, Martha. Don't need...

    Nah.....nothing wrong here, Martha. Don't need no stinkin' Screen Voltage nohow.
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    I don't recall if there was polyfill damping. If...

    I don't recall if there was polyfill damping. If there was, I had removed it and tossed it out. What's shown in that one photo was what I had added. Normally, I'd be using fiberglass, but didn't...
  16. This folder is from the one I have. Mine didn't...

    This folder is from the one I have. Mine didn't have the Block Diagram, nor the power supply, the two Matrix Switching diagrams nor the Foot Pedal diagram. Thanks.
  17. Thanks, Pedro!

    Thanks, Pedro!
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    I assume you meant D50 and not D2 (which is...

    I assume you meant D50 and not D2 (which is feeding the gates of Q1 & Q2). I'm not sure why the zener voltage of D3 is now lower than it was. You might want to change it as well, as you found three...
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    Magnatone M15A Restoration & Reverb Tank location

    Yes. I restored one back in 2013, I think it was. The tank was mounted on the rear wall, down deep, as seen in the photo attached.

    58539 58540 58541 58542 58543 58544 58545 58546 58547

    This...
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    I've been lucky so far, concerning coming into...

    I've been lucky so far, concerning coming into contact with the high voltage on CRT's. My last shock, which still has my mystified how, was working on a Mesa Mark V Combo Amp chassis. It wasn't the...
  21. I looked thru my Mesa Folder to see if I have...

    I looked thru my Mesa Folder to see if I have more schematics on the Mark IV. Not all of the schematics are present. It's missing the Switching Matrix, where all of the LDR's are shown being...
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    I don't yet know. I'm assuming at least bipolar...

    I don't yet know. I'm assuming at least bipolar supplies, utility and digital supplies. Thus far, I've only replied to the email inquiry sent to me. I don't yet know his console size, whether it's...
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    Soundtracs Jade Console Power Supply

    I was contacted by an owner of a Soundtracs Jade Recording Console that has a failed power supply. He found me by way of someone who knows me/of me in the Pennsylvania area, with his operation down...
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    D50 is bad, from the readings you're reporting,...

    D50 is bad, from the readings you're reporting, while D3 is good. If you have any low voltage 1W zeners, and 1N4002 or higher, you could cobble a zener close to 5.6V for temporary to replace D50 and...
  25. While I've been a Tektronix scope owner/user for...

    While I've been a Tektronix scope owner/user for decades, this one seems really expensive for what it is. Now, I'm a bit biased with my choice of their older high quality bench scopes (7000 Series),...
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    My apologies on the zener value. I was going by...

    My apologies on the zener value. I was going by memory and didn't look it up to confirm. And my mistake calling the upper zener D4, when it IS labeled D50 on my schematic as well. I may have a...
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    I have another thought. Since you own four of...

    I have another thought. Since you own four of these VS100 amps, that gives you modules that you can swap to see if you can make the problem move or stop.
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    OK....you're a lot further along with these than...

    OK....you're a lot further along with these than I am. I've only been inside a couple of their Valve State amps, though not this one. I mostly service JCM 800's, 900's, 2000's and TSL heads and...
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