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LED Tuning indicator for 37-6xx Series
AI2V
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Posts: 201
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Joined: Dec 2005
City: Morris Plains, NJ
#1

08-14-2007, 10:12 PM
It may make the purists irate, but here's an addition to your Philco Frankenradio-

An extremely simple LED tuning indicator for the 1937 series - an LED in series with a 150K ohm resistor to ground; the other end of the LED connects to pin 1 of the 6Q7 AGC detector. You may want to adjust the resistor value; also a cap across the LED might improve it a bit.

DO NOT connect your LED/resistor to the AGC feedback line; doing so will cause distortion and a loss of sensitivity.
Pete AI2V
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Messages In This Thread
LED Tuning indicator for 37-6xx Series - by AI2V - 08-14-2007, 10:12 PM
[No subject] - by Texasrocker - 08-14-2007, 10:49 PM
Shadow meter still is best - by AI2V - 08-15-2007, 09:16 AM
[No subject] - by Terry Judkins - 08-15-2007, 10:35 AM
Correction in connection - by AI2V - 08-15-2007, 02:26 PM
[No subject] - by Texasrocker - 08-15-2007, 11:22 PM



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