[Collins] 75A-3

Joe Walden w5jdy at cox.net
Fri Feb 3 00:14:08 EST 2012


Hello again from Joe w5jdy in Okla...    Got most of the kinks out of the
not-working 75A-3 receiver I received as a gift..  After restoring the radio
according to the schematic I have it working  pretty darn good....  I am now
attempting to instal the Collins mods according to their Service Bulletins..
Everthing has gone smooth up to Bulletin #1 date 1-22-54 step #3 where it
says to connect a (100,000) 0hm resistor between pins 1 and 2 on the bottom
of the mechanical filter adaptor..  In the explanation below that,it says-
The (10,000) ohm resistor,not a (100,000) ohm resistor serves to lower the
plate load of V18..
My question is:   There is already a resistor part #81 in the radio and it
is a 4700 ohm resistor..  Do I remove this resistor and replace it with a
100,000 or a 10,000 ohm resistor.....  Thanks for your time..  Joe W.



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