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Thread: 5e3 junk box build voltages

  1. #1
    Master Destroyer nosaj's Avatar
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    5e3 junk box build voltages

    I've just finished my 5e3 junk box build and checking the voltages

    on 5y3 pin 8 314vdc

    on one 6v6
    pin3 294 pin4 264 pin5 27 pin6 27 pin8 28vdc

    other 6v6 pin3 309 pin4 262 pin5 and pin6 0vdc pin8 28


    Which of the above 6v6 is right with no signal applied?
    I know it probably a miswire somewhere as I went true point to point.
    Thanks,
    Jason

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  2. #2
    Senior Member ThermionicScott's Avatar
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    I would double-check the wiring for 6V6 #1's grid connection (pin 5) -- the connection to the 1.5k grid-stopper, or path to ground through the 220k grid-leak resistor may not be good, or the coupling cap to the PI may also be bad. The positive voltage on its grid would explain why it is drawing more current and dropping more plate voltage through the OT.

    Overall, I would not be dismayed if your voltages still end up on the low side compared to other 5E3's. It should still sound good in the end.

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  3. #3
    Master Destroyer nosaj's Avatar
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    It was a coupling cap that was passing voltage just found an replaced it. Time to tighten everything up .

    Thanks for Looking Jason

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    Supporting Member Jazz P Bass's Avatar
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    Uhmmm.

    Which coupling cap?????

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    Master Destroyer nosaj's Avatar
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    on one 6v6
    pin3 294 pin4 264 pin5 27 pin6 27 pin8 28vdc

    The one passing dc voltage to pin5.

    thanks,
    nosaj

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  6. #6
    Supporting Member Jazz P Bass's Avatar
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    Ouch.

    Thanks for the reply.

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  7. #7
    Master Destroyer nosaj's Avatar
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    Why the Ouch?

    nosaj

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    Don't forget the joker g1's Avatar
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    I think he meant "ouch" is what the tube said.

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    Well that's a heck of a leaky cap... I'd rather use that one as a dropping resistor...

    Justin

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  10. #10
    Master Destroyer nosaj's Avatar
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    Wouldn't DC on the grid have been noisy? The amp is louder with the new cap in.
    Leaky cap thats what i get for using a NOS cherry tv cap. It was a ceramic cap with metal sides from the 70s cracked it open dry as a bone. I would say that'll teach me, but I tend to be a stubborn.

    nosaj

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    Last edited by nosaj; 01-03-2016 at 03:01 AM.

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    Supporting Member eschertron's Avatar
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    Quote Originally Posted by nosaj View Post
    I would say that'll teach me, but I tend to be a stubborn.
    Well, c'mon! You choose the vintage-correct parts because you want the vintage-correct failures, don't you?

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    Master Destroyer nosaj's Avatar
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    Well it's not a bad part till it fails is it? I'd bought an old hams electronic bins at a garage sale and when I do a junk build I try to pull from it. But i have to say not 10 mins after I posted the question I had gone back out and saw the answer before me replaced the part and when i came in had the same answer waiting for me. I'm slowly getting there. Now I have to find someone that can play well to tell me what they think of it.

    Thanks to all you guys out there for not telling me to go away or take my stuff to a tech

    nosaj

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  13. #13
    Master Destroyer nosaj's Avatar
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    If anyone want's to see the mess I made
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    Electrons don't care what it looks like!

    It's good practice to allow some space between a (hot running) power tube cathode resistor and its bypass cap, so that air can circulate / avoid direct heat conduction between the two.

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  15. #15
    Master Destroyer nosaj's Avatar
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    Thanks for the pointer. So far with a bass on the higher strings it sounds pretty good, I really like the interactive controls.

    nosaj


    Put a guitar with humbuckers on it, really cool sounds good with old eminence.Click image for larger version. 

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    Last edited by nosaj; 01-03-2016 at 04:43 PM.

  16. #16
    Senior Member ThermionicScott's Avatar
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    Quote Originally Posted by nosaj View Post
    Wouldn't DC on the grid have been noisy? The amp is louder with the new cap in.
    Leaky cap thats what i get for using a NOS cherry tv cap. It was a ceramic cap with metal sides from the 70s cracked it open dry as a bone. I would say that'll teach me, but I tend to be a stubborn.

    nosaj
    Glad it's working now! I learned the same lesson when I attempted to build a '52 Pro clone with as many old parts as possible -- every paper cap turned out to be leaky as hell, so I sucked it up and replaced them with polyester caps.

    If I may offer some further advice -- point-to-point is awesome, but having a bunch of components soldered together in midair is begging for a lead to break or a short against the chassis as stuff swings around. I'd add a couple more terminal strips and lash everything down.

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