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Repair Help on 1936 Philco Cathedral Radio
KB1PKS
Junior Member
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Posts: 21
Threads: 2
Joined: Jan 2022
City: Bethel State, Province, Country: Connecticut
#30

04-24-2022, 09:39 PM
Dear Terry and Mondial,

Thank you both for these tips!

Today I tested all the tubes in my Hewlett Packard Model 400H on my Hickok 539C tube tester (recently purchased) and I found V1 Cathode Follower (6CB6) to be bad (3700 mmho, spec is 3900 min), V7 Series Regulator (12BA4) to be bad (5000 mmho, spec is 6000 min) and the V9 (5651) Reference Tube to be completely dead! First I will seek to replace these three tubes and if replacement fails to correct the meter zeroing issues I will seek to replace diodes CR-1 and 2 and /or the 2 uF caps in the meter circuit.

Thanks again for all your help!

Bill
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RE: Repair Help on 1936 Philco Cathedral Radio - by KB1PKS - 04-24-2022, 09:39 PM



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  1. The PHILCO Phorum
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