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  1. Thread: Choke experiment

    by mozz
    Replies
    4
    Views
    134

    You didn't say new design. Anyway, i don't think...

    You didn't say new design. Anyway, i don't think a OA2 is 40's, its a 7 pin. Used in many pieces of Tektronix test equipment. You can get hundreds of them cheap. Instead of daisy chaining all your...
  2. Thread: Choke experiment

    by mozz
    Replies
    4
    Views
    134

    How about a VR tube? Only a couple ma right? You...

    How about a VR tube? Only a couple ma right? You can stack them to get higher voltages. Other than that, I think you would need higher henries than 5H.
  3. Replies
    5
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    261

    Yes, you need to use a fine sandpaper (carefully)...

    Yes, you need to use a fine sandpaper (carefully) before you wrap into the rivets. The solder should flow nice. I do the start rivet soldering before i even wind, because if it breaks when you are...
  4. You need to gold plate them. Ok, not feasible....

    You need to gold plate them. Ok, not feasible. Tin whiskers on the contacts? Maybe some type of sealant?

    I've bought outdoor chinese led christmas lights strings, the light bulb into the socket...
  5. Filament voltage? I ask...

    Filament voltage? I ask because........................if that voltage is high, other voltages will be high, and......................................people have a tendency to always bump up the...
  6. I don't think you're gonna get much sound out of...

    I don't think you're gonna get much sound out of 38awg pickup but i could be wrong on that.
  7. Replies
    23
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    674

    Find any HP or Tektronix piece of test equipment...

    Find any HP or Tektronix piece of test equipment (50's on up) that has dual voltage tranny. Wire it up like that, they often use a slide switch.
  8. Replies
    12
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    372

    You have a bad tube.

    You have a bad tube.
  9. Replies
    5
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    319

    Aliexpress. I've bought hundreds, no problems...

    Aliexpress. I've bought hundreds, no problems with fit or finish on any flatwork I've bought(addiction fx).
  10. Thread: 6P14P-K

    by mozz
    Replies
    11
    Views
    816

    Dumb me. I ran a 10k node for the screens after...

    Dumb me. I ran a 10k node for the screens after the choke. Way too much, screen voltage was dropping terrible when signal was applied. Went to 1k and things and output power was much improved. Then i...
  11. Thread: 6P14P-K

    by mozz
    Replies
    11
    Views
    816

    Pretty sure Rob's calculator subtracts 5.5% for...

    Pretty sure Rob's calculator subtracts 5.5% for screen current. Let it sit idle last night for 1/2 hour, wall voltage 122v, plate 408v screen 365v, 13.5v on 250 ohm cathode resistor. Drawing 60...
  12. Replies
    5
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    319

    AliExpress.

    AliExpress.
  13. Thread: 6P14P-K

    by mozz
    Replies
    11
    Views
    816

    From what i can see, most of the Russian tubes...

    From what i can see, most of the Russian tubes are 14w. The -ev -eb are supposed to be rated at higher voltage too. Since these are -k, i'm pretty sure they would be also higher rated than a regular...
  14. Thread: 6P14P-K

    by mozz
    Replies
    11
    Views
    816

    6P14P-K

    Building a scratch amp from parts laying around. Power trans is kind of hot for EL84. I have some of these Russian 6P14P-K tubes.(marked OTK cccp) Have the output section built, cathode bias push...
  15. Replies
    15
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    443

    I have removed them before, but at the same time...

    I have removed them before, but at the same time I upgraded to a larger output transformer for a customer. Whether you can hear a sound difference, I don't know. Maybe the manufacturer saves a few...
  16. Replies
    5
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    335

    Change the socket. If you're cheap try drilling...

    Change the socket. If you're cheap try drilling out the socket rivets and put a spacer in there to move it further away from the chassis.
  17. Do you have a watt meter? Measure at idle....

    Do you have a watt meter? Measure at idle. Measure at signal. Draw will go up with signal if a PP design. If wattage stays the same, there is no possible way anything is running hotter.
  18. Replies
    17
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    976

    Have fun removing the old poly. Not easy. It...

    Have fun removing the old poly. Not easy.

    It would be much easier to buy another body and finish it how you want. You can get generic strat bodies as low as $45.
  19. Well if you just want them to work i guess you...

    Well if you just want them to work i guess you can glue them in, that was kind of a joke, if i was winding for a customer, no. Some times you can buy a complete set of chinese humbuckers for about...
  20. If it's a Chinese pickup kit, often the parts...

    If it's a Chinese pickup kit, often the parts don't fit right. I've had bobbin hold down screws that were 3 sizes too small. Wouldn't the magnet hold the slugs in, until you crazy glue them in anyway.
  21. Replies
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    425

    There's a few other tricks besides proper bending...

    There's a few other tricks besides proper bending of the ribbon cables. I may have had to use the 100pf too.

    http://billmaudio.com/wp/?page_id=115
  22. Replies
    14
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    425

    These are known to oscillate. I was working on...

    These are known to oscillate. I was working on one in the garage and once i saw the oscillation on the scope, i noticed the cat went running out the door about 150mph. I think moving the ribbon...
  23. Replies
    3
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    203

    Pictures? I have a few junked Peaveys here.

    Pictures? I have a few junked Peaveys here.
  24. You can make a simple bias tester out of a old...

    You can make a simple bias tester out of a old tube, a tube socket, and a 1 ohm resistor. The more you work on amps, it will come in handy.

    A simple trick to reduce a tiny bit of current is to...
  25. Replies
    16
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    486

    Here's another anomaly , 2n6519 is not the same...

    Here's another anomaly , 2n6519 is not the same as MPS6519, whereas 2n2222a is practically the same as MPS2222A. Watch those prefixes.
  26. Replies
    16
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    486

    One rule of thumb is 2sa and 2sb were all PNP, I...

    One rule of thumb is 2sa and 2sb were all PNP, I think so.
  27. Replies
    16
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    486

    Thought you were retired? Generally, any round...

    Thought you were retired?

    Generally, any round japanese transistor is not ecb. I have some 2sc458, original, used in many tape decks, they are not ecb. In my Sams transistor spec manual, i can see...
  28. Replies
    16
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    486

    Not all Japanese small transistor 2s series are...

    Not all Japanese small transistor 2s series are pinout ecb. If you're gonna work on a lot of transistor stuff, get a Peak DCA 55.
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