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  1. I had the exact same amp last year, same problem....

    I had the exact same amp last year, same problem. This happens to about 95% of them, either broken or lost. I bought some various knobs online, some work ok, but i didn't think i found anything that...
  2. Taking bias readings with the light bulb or not?

    Taking bias readings with the light bulb or not?
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    Lucky to see 30w in a old amp like that. I can...

    Lucky to see 30w in a old amp like that. I can even bet they are 6l6 metal, or the original ones were anyway.
  4. I was always taught to go careful on anything...

    I was always taught to go careful on anything with plating. Brass brush works best, maybe some spray chemicals.
  5. Best cap does not mean the best sounding amp....

    Best cap does not mean the best sounding amp. F&T's have a good reputation among guitar amp repairers, builders and upgraders. If you look at the specs, they are not the best cap to make the best...
  6. Thread: Decibel Meters?

    by mozz
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    488

    They make mics you plug in the headphone jack on...

    They make mics you plug in the headphone jack on andriod phones. Also parts express sells db meter for $22- $40.
  7. Some sort of Paraphase. There is a model with a...

    Some sort of Paraphase. There is a model with a 6av6 preamp, that's where somebody said it's close to a Harvard.
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    Close enough. How else would you get a close...

    Close enough. How else would you get a close result without overly complicating the repair?
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    No, it should be exactly the same. You have a...

    No, it should be exactly the same. You have a linear pot with the wiper tied to the end, 100k across it now it's a 50k linear.
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    That's just how all lead free solder joints look!...

    That's just how all lead free solder joints look! Seriously though, look at the build quality and organization, guy might not be a perfect soldering tech but looks well enough built to work first...
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    From looking at the pictures, it looks like a...

    From looking at the pictures, it looks like a pretty decent homemade build. I would say well worth getting it running, i doubt very much it needs a power transformer, you just need the right tubes in...
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    Put a pair of el34s in there and see what...

    Put a pair of el34s in there and see what voltages you end up with. Other than that, the power transformer/transformers may be worth more to someone looking to restore the Heathkit W5m
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    http://akdatabase.com/AKview/albums/userpics/10007...

    http://akdatabase.com/AKview/albums/userpics/10007/Heathkit%20Power%20Transformers.pdf
  14. Thread: Choke experiment

    by mozz
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    642

    Have you tired the 5H and a smaller cathode cap?

    Have you tired the 5H and a smaller cathode cap?
  15. Think it was 2 transistors for a basic wah. I...

    Think it was 2 transistors for a basic wah. I would buy or make the PCB or perf, reuse the inductor if it's 500mh and the pot, junk the rest.
  16. Thread: Choke experiment

    by mozz
    Replies
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    642

    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...
  17. Thread: Choke experiment

    by mozz
    Replies
    9
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    642

    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.
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    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...
  19. 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...
  20. 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...
  21. 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.
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    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.
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    You have a bad tube.

    You have a bad tube.
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    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).
  25. Thread: 6P14P-K

    by mozz
    Replies
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    1,633

    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...
  26. Thread: 6P14P-K

    by mozz
    Replies
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    1,633

    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...
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    AliExpress.

    AliExpress.
  28. Thread: 6P14P-K

    by mozz
    Replies
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    1,633

    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...
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