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  1. Oh very cool idea, thanks, will try that as well....

    Oh very cool idea, thanks, will try that as well. Finally got a space cleared out in the basement, and some old kitchen cabinets and a piece of old kitchen counter for a workbench. Now no one...
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    Ah, OK, so that's why the "laydown" design...

    Ah, OK, so that's why the "laydown" design marshall and fender: the PT center leg is parallel to the chassis, and at right angle with respect to the OT which stand up. So, both transformers for...
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    Awesome, thanks Leo! Will hit that "buy" button...

    Awesome, thanks Leo! Will hit that "buy" button before these Cinch's sell out. Used to see these all the time, now more and more "last one!!"
  4. Oh boy did I misunderstand RG's 'immortal mods'...

    Oh boy did I misunderstand RG's 'immortal mods' article. What I don't understand: so suppose you have a 345 - 0 - 345 vac rms secondary power transformer. The center tap is grounded. When charge...
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    help with 9 pin tube sockets

    I had built an amp with a steel chassis. I used self tapping screws. so there is no nut on the inside of the chassis. The benefit is that the screw shank is fairly far from the nearest tube pin, so...
  6. Awesome, thanks. Have you ever built or rewired...

    Awesome, thanks. Have you ever built or rewired an amp with a daisy chain ground scheme like this? For me, fear of a very large unknown.
  7. Hi Tubeswell, Getting close to the...

    Hi Tubeswell,
    Getting close to the point of having to decide where the ground wires would go. This board (completely by accident) is laid out so that the daisy chain scheme would be easy...
  8. Board is tighter fit than anticipated. By dumb...

    Board is tighter fit than anticipated. By dumb luck, just fits under the input jacks and pilot light. Had to drill out all the holes except switches and IEC. didn't butcher them too badly. ...
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    Awesome, thanks El Dudarino!

    Awesome, thanks El Dudarino!
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    Oh and the other comments Ive seen talk about...

    Oh and the other comments Ive seen talk about really expensive Mumetal guard between the two, but Ive never seen a commercial amp like that.
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    PT and OT transformer core orientation

    Hi All
    I got the sorta kinda general idea, but not what to do in practice. I have an amp project, a Supro Thunderbolt S6420 in a JTM45 chassis. The two transformers, PT and OT are...
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    Im not an ee amp wizard like most people on MEF,...

    Im not an ee amp wizard like most people on MEF, can't offer a lot more than moral support, but you might get a strong mag light, and look carefully at every solder joint. A few around the tube...
  13. THinking about downloading the source code, and...

    THinking about downloading the source code, and seeing what makes DIYLayoutCreator tick. Nire program, would be nice to have discrete parts that you can bend the leads into place, like the cathode...
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    I couldn't find a Mission Scholar schematic...

    I couldn't find a Mission Scholar schematic online. does "SE" mean single ended? Maybe can you post a schematic and few gut photos?
  15. Thanks!!!

    Thanks!!!
  16. need re-engineering or leave well enough alone? -- grid stops on input jacks

    Im assuming the 2 47k resistors on the input jacks are functioning as "grid stops". The grid leak is on the other side of the 0.005 cap.

    Is it better to
    - to leave well enough alone,
    - ...
  17. DIY Layout Creator is pretty good and very easy...

    DIY Layout Creator is pretty good and very easy to use. A few things not possible to do, like bend leads on parts; rotate tube sockets, but the workarounds are good enough. At least, better than...
  18. so, the repurposed Deluxe Amp AB763 eyelet board...

    so, the repurposed Deluxe Amp AB763 eyelet board was so ugly, parts all crooked, that I fished around and found the link to DIYLayoutCreator on Doug Hoffman's Amp site. A lot easier to use than I...
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    Cool. if you find out anything, find a way to...

    Cool. if you find out anything, find a way to let us know ;)
  20. Hi sorry to bother you again, Re: "Example:...

    Hi sorry to bother you again, Re:

    "Example: max. screen dissipation = 5W, screen node dropper = 1k, assumed screen voltage at full power = 425VDC. This gives 2x5W/425V = 23.5mA max. screen...
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    Beautiful stuff, anyone on the board live in...

    Beautiful stuff, anyone on the board live in Italy?
  22. So i have the overall idea down pretty well I...

    So i have the overall idea down pretty well I think, but don't have my sea legs for specific numbers/ranges. I understand no load, and load and its affect on voltage a bit. But how do you...
  23. Hi Helmholtz, thanks YES I misunderstood your...

    Hi Helmholtz, thanks YES I misunderstood your original. OK understand now.
  24. Question: plenty of room to move the two power...

    Question: plenty of room to move the two power supply caps feeding the preamp tube and phase inverter tube, next to where they are connected to the plate resistors. Is it better to have those...
  25. Got some parts 'roughed' in, not soldered and...

    Got some parts 'roughed' in, not soldered and trimmed yet. Installed a few more turrets to make the mounting distance small enough for these new teeny resistors. (dang, dug through both boxes of...
  26. Thanks Helmholtz. For the values "at full output,...

    Thanks Helmholtz. For the values "at full output, or 10% below" is there a way to determine/estimate the numbers before the amp is built, i.e. amp not built yet so can't measure directly?
  27. Hi Rob, so the power trans. and output trans are...

    Hi Rob, so the power trans. and output trans are the same as vibroverb spec?
  28. Awesome, thanks Greg. I did get a note back from...

    Awesome, thanks Greg. I did get a note back from Arlyn, will buy from them.
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