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  1. Replies
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    Very difficult for someone like me. The old data...

    Very difficult for someone like me. The old data sheets, from 50's, 60's, have tons of data. The new data sheets, e.g. from JJ, are 1/2 sheet.
  2. I found this transformer, closest to the HV...

    I found this transformer, closest to the HV winding voltages recommended. The others were either too high hv voltage, or way undersized re HV secondary current rating. Is there any problem using...
  3. Beautiful amp! Side question, when we build...

    Beautiful amp! Side question, when we build these amps with eyelets and hand wiring on the board, we use like 22 ga wire. How do you ensure that you get at least that on a PCB board trace? ...
  4. Thanks everyone!!! So, for a hack build, I...

    Thanks everyone!!! So, for a hack build, I thought Id use the small/modern better spec'd caps, and just put pairs of turrets close enough together to wrap the leads around each turret, then lay...
  5. Cool, thanks Nick, will do.

    Cool, thanks Nick, will do.
  6. Thanks Helmholtz. I thought they were these: ...

    Thanks Helmholtz. I thought they were these:

    https://www.ftcap.de/fileadmin/user_upload/produktboxen/elektrolyt_kondensatoren/webboxen/axiale_Kondensatoren/A2012.pdf

    size is same as what Im...
  7. power supply capacitor size in tube amps

    The F&T caps we get online are pretty big compared to other electrolytic caps you can get these days. I bought some (think it was panasonic) radial (since they don't sell axial this spec) 10 and...
  8. Awesome, thanks, reading and re-reading. I think...

    Awesome, thanks, reading and re-reading. I think I got it.

    (Sorry, have to get used to a single "thanks everyone" rather than one for each post :) to avoid so many thank you posts. Read all and...
  9. Thanks!

    Thanks!
  10. One last question :) This amp will go close...

    One last question :) This amp will go close to 500v with no load, which is close to the filter cap rating. Ive seen bigger amps, like Fender Twin, use two caps in series, and 'balance'...
  11. So, if there were 3 lugs, one PS, one PI and one...

    So, if there were 3 lugs, one PS, one PI and one for the 'quiet stuff', with the quiet lug mounted at the far end of the chassis, ...

    54297
  12. Thanks, reading now! OK I have the...

    Thanks, reading now!
    <edit>

    OK I have the main ideas, but run into something Im not sure about (and probably get wrong). I got the "local star" concept. A filter cap that feeds a section of...
  13. Thanks, will do. Should these leads also run...

    Thanks, will do. Should these leads also run along the chassis, or is it better to make them shorter 'flying'?
  14. Does the negative side of the power supply...

    Does the negative side of the power supply rectifiers need to be tied to the chassis, or can it just be hooked up to the - side of the filter caps and the power tube cathode?
  15. Thanks Loud! (Doesn't look so good, but that is...

    Thanks Loud! (Doesn't look so good, but that is what I did. :) Took a couple of pieces of printer paper, held over the board, and marked the eyelets out. Make copies of that, then drew components...
  16. Its hand drawn, will get into PCB software asap. ...

    Its hand drawn, will get into PCB software asap. Don't laugh. OK go ahead, laugh, (I did too).

    54274
  17. Well I got my by-hand drawing fairly close (I...

    Well I got my by-hand drawing fairly close (I think, maybe). will try out the PCB software tonight.

    Question for you all: I have a fiberglass eyelet board from one of the versions of Fender...
  18. Awesome, thanks Tony, will try them out when I...

    Awesome, thanks Tony, will try them out when I get off work tonight.
  19. Layout question

    I found a few layouts, this is one. critique is that some components are laid out so that a long wire has to go all the way across the board, to get to the tube pin. And the connection to pin8 on...
  20. Thanks Tubeswell, I 'll check them out.

    Thanks Tubeswell, I 'll check them out.
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    Fantastic work Randall. Wish I had 10% of your...

    Fantastic work Randall. Wish I had 10% of your skills.
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    My eyesight is shot (has been since I was 3) so I...

    My eyesight is shot (has been since I was 3) so I have to use a magnifying glass to find the cold solder joints.
  23. Thanks Tubeswell. Having a tough time finding...

    Thanks Tubeswell. Having a tough time finding that transformer. Found quite a few with higher B voltage secondary, but most with lower B have a lot lower current rating, unless maybe Im looking...
  24. so the final question: 350-0-350v secondary...

    so the final question: 350-0-350v secondary power transformer from Classictone, which will result in higher B voltages, or a different brand that has about 300 -0 - 300v?
  25. Thanks!

    Thanks!
  26. Very interesting, more stuff I don't understand...

    Very interesting, more stuff I don't understand yet! Re
    "Also, the cathode-biasing of the 6L6s tends to bring the B+ voltage down quite a bit from what you'd expect if you otherwise ran them with...
  27. Wow, wow, thanks everyone, reading, reading . . .

    Wow, wow, thanks everyone, reading, reading . . .
  28. Ah got it thanks. I don't have a handle on...

    Ah got it thanks.

    I don't have a handle on what 80 volts difference B+ would do to this amp. The 350 - 0 - 350 Classictone, they say is original design, would produce something like 490v dc...
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