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37-630 I.F. connections?
Ron Ramirez
Silent Key
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Posts: 13,776
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Joined: Sep 2005
City: Ferdinand State, Province, Country: Indiana
#5

01-21-2012, 05:06 PM
This was a revision to the 37-620 and 37-630; documented in Bulletin 251A.

The extra winding is in the 1st IF transformer. The "long black" lead goes to the suppressor grid (pin 5) of the 6K7 IF amplifier tube; the "short black" lead goes to ground.
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Ron Ramirez
Ferdinand IN
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Messages In This Thread
37-630 I.F. connections? - by Dad - 01-21-2012, 02:22 AM
Re: 37-630 I.F. connections? - by codefox1 - 01-21-2012, 11:54 AM
Re: 37-630 I.F. connections? - by Texasrocker - 01-21-2012, 01:07 PM
Re: 37-630 I.F. connections? - by codefox1 - 01-21-2012, 02:31 PM
Re: 37-630 I.F. connections? - by Ron Ramirez - 01-21-2012, 05:06 PM
Re: 37-630 I.F. connections? - by Dad - 01-22-2012, 02:06 AM



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  1. The PHILCO Phorum
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  3. Philco Electronic Restoration