philco 90 tube sheild - Printable Version

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+--- Thread: philco 90 tube sheild (/showthread.php?tid=18037)

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philco 90 tube sheild - mg34.42 - 03-03-2018

ok my philco 90 was working fine and all of a sudden the volume went low I have checked the caps and resistors but when I remove the main tube shield the volume starts to work again I am suspecting a coil any feed back is welcome
benny

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RE: philco 90 tube sheild - Radioroslyn - 03-03-2018

Hi Benny,
I assume you've serviced this chassis. Would have a look at the tube's heaters to be sure they are lit when the volume is low.  Check the grounds at the block caps to be sure the bolts are snug. Connections at the tuning cap and grid caps on tube (resolder at tube).
Check the rf and osc coils for green dots, if found rewind the primary (small winding).

Happy Hunting!

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RE: philco 90 tube sheild - mg34.42 - 03-03-2018

OK if I wind up having to rewind the primary on the RF coil does it matter what direction I wind the coil

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RE: philco 90 tube sheild - morzh - 03-03-2018

I was about to say RF coil open.

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RE: philco 90 tube sheild - Radioroslyn - 03-03-2018

To answer your question no it doesn't matter on the ant or rf amp coils. However the oscillator coil does.

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RE: philco 90 tube sheild - mg34.42 - 03-03-2018

ok I found the trouble had a broken wire coming off of the second rf coil going to the tuning gang  I tapped on the wire and I got a pop dose any one know the value of the volume control
benny

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