09-22-2019, 03:21 PM
"I doubt that extra capacity on the filter condensers was a problem with the 51x17."
Yes Mike,...I wasn't necessarily suggesting the new caps were the reason a tube now appears to have gone bad in the Motorola, ( it worked fine for weeks). They're probably just getting old. I'm wondering if some of them are originals. I'm just without a way to find out which one. It may very well not even be the rectifier that's bad.
"Much later designs use a cathode resistor with a bypass condenser to cause the grid to bias negative, . . . "
it will take me a while to wrap my head around what you say here. I'm trying!
" If you have a bad power transformer, . . . "
I just wish I knew when it went bad..... before I bought the 39-6 ( even though it worked a little when I got it), or afterwards, when I re-insulated the leads and somehow damaged it working on it.
I guess that should be taken up in another thread.
Yes Mike,...I wasn't necessarily suggesting the new caps were the reason a tube now appears to have gone bad in the Motorola, ( it worked fine for weeks). They're probably just getting old. I'm wondering if some of them are originals. I'm just without a way to find out which one. It may very well not even be the rectifier that's bad.
"Much later designs use a cathode resistor with a bypass condenser to cause the grid to bias negative, . . . "
it will take me a while to wrap my head around what you say here. I'm trying!
" If you have a bad power transformer, . . . "
I just wish I knew when it went bad..... before I bought the 39-6 ( even though it worked a little when I got it), or afterwards, when I re-insulated the leads and somehow damaged it working on it.
I guess that should be taken up in another thread.
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