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Philco 81 Front End Problem
exray
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Posts: 893
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Joined: Mar 2008
City: Vieques, PR USA State, Province, Country: PR
#4

02-02-2009, 10:45 PM
Good on your findings. Sounds like we can zero in on the oscillator.

I would bring in the following subjects for questioning...

Part #5 - .0014 cap
Part #10 - 6k resistor

I also wouldn't rule a out a high-R open in the OSC coil p/n #12.

I'm somewhat confused about the relationship between trimmer p/n #11 and the adjustment numbers in the alignment instructions. If you have a better handle than I do on the physical layout of the set that trimmer might have some effect on the ability to oscillate.
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Messages In This Thread
Philco 81 Front End Problem - by Guest - 02-02-2009, 07:56 PM
Re: Philco 81 Front End Problem - by exray - 02-02-2009, 08:41 PM
Re: Philco 81 Front End Problem - by Guest - 02-02-2009, 10:00 PM
Re: Philco 81 Front End Problem - by exray - 02-02-2009, 10:45 PM
Re: Philco 81 Front End Problem - by Steve Davis - 02-02-2009, 11:12 PM
Re: Philco 81 Front End Problem - by Guest - 02-05-2009, 08:48 PM
Re: Philco 81 Front End Problem - by Guest - 02-06-2009, 06:45 PM
Re: Philco 81 Front End Problem - by exray - 02-06-2009, 07:01 PM



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