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RCA 6K3 Preliminary Capacitor/Resistor Research
#55

Quote:I change all old electrolytics and paper caps period. Even if some test okay (are you measuring capacitor leakage at rated voltage?), they may be disasters waiting to happen. When I restore a set I want it to keep working indefinitely. Replacing the parts which are most likely to fail is for me worthwhile to prevent possible later failures.

Dale, allow me to clarify, the "... that are out of tolerance" was specifically meant for the resistors.  All electrolytics and paper capacitors are understood to need replacing.  I do not test them.

By "shunting across" with the DMM, I take it you mean to have the resistor in series between the test lead and the point in the radio under test?

The current status of this set is: all electrolytic and paper capacitors replaced, out of tolerance resistors replaced, two NOS tubes (6H6 and 6F6) installed to replace completely missing ones, no other tubes having been tested (I own no tester at present).  Could I bother you for specifics on ohming out inductor and transformer windings?  I may have done some of this already but again, I want to be sure of my understanding of the terms and process.  In working back toward the power supply, in the case of the two 61.6V instead of 100V readings, would it be back to the resistor, then to the electrolytic, etc?

The voltages are as followed:
at the pins as tested, originally 61.6, now 63.5 for whatever reason
on the tube-side of resistor R4 (22K ohm), 63.3
between R4, electrolytic C16, and connection to oscillator coil, 175.5
at the R14/R15 junction on the candohm, 174.2
at the end of the candohm, 265

Arran, do you have any suggestions for specific tube testers that I should be on the lookout for?  As above, I don't have a tester now, though there was a Kickok on eBay I was watching that ultimately went for around $150 plus shipping just a couple nights ago.

Rod, as I am now, with antenna attached able to receive some stations, would you still say the oscillator isn't running?

Thank you all again for your guidance in making this set all that it can be.

Best wishes,
Roy


Messages In This Thread
RE: RCA 6K3 Preliminary Capacitor/Resistor Research - by glyphmon - 05-10-2026, 08:57 PM



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