With time constraints, a 6SJ7 replaces a 36 - Printable Version

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+--- Thread: With time constraints, a 6SJ7 replaces a 36 (/showthread.php?tid=3873)

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With time constraints, a 6SJ7 replaces a 36 - AI2V - 10-25-2011

Under strong pressure to complete a Philco 19, I easily swapped a dud 36 tetrode in a charred tube socket to a 6SJ7 and a new porcelain socket. The only wiring change was the grounding of the suppressor grid. I didn't have any spare 36's or 77's at the moment. At some time in the future the owner may want it converted back to a 36 tube but until then the radio works fine on both bands.

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Re: With time constraints, a 6SJ7 replaces a 36 - Arran - 10-25-2011

I wonder how a socket for a type 36 would get charred? It isn't a rectifier, nor a power output tube, it's an RF amplifier tube, so unless it somehow got hit by lightning someone must have really molested the set.
Regards
Arran

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Re: With time constraints, a 6SJ7 replaces a 36 - AI2V - 10-26-2011

It was a charred arcing path from the plate connection to ground; most likely it started with a liquid of some sort getting on the socket. Normally this is only found in audio output and rectifier stages but it's not confined to those.

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Re: With time constraints, a 6SJ7 replaces a 36 - Ron Ramirez - 10-26-2011

Sometimes you gotta do what ya gotta do...especially when you have an owner who wants the set fixed yesterday. Good job in getting another one going again.

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Re: With time constraints, a 6SJ7 replaces a 36 - codefox1 - 10-26-2011

When I do a switcheroo, I always stick a note inside saying what I did and why. Just so the next old fart doesn't have to scratch his bald head.

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