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Zenith TO H500
morzh
Odobenus rosmarus
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Posts: 15,806
Threads: 553
Joined: Oct 2011
City: Jackson, NJ
#16

01-06-2019, 11:11 PM
Has been some time, I went to FL and back, and after having received the alignment instrument I went back to the radio. After having aligned the IF I started aligning the BC band when my reception faded out. Came back after a few second power cycle.
First I thought it was a tube, and the tube lineup happened to be 100% identical to the Stromberg Carlson AWP-8, so I changed the tubes one by one to no result.
Then I checked B+ and found it drooping so I figured it was the selenium rectifier.

I changed it for the 1N4007 plus 47 ohm resistor, shich seems to be the recommended combination.
It works but the voltage on the output plate is about 10V higher than indicated (the resistor drops just 3V). Everything works but I will use a larger resistor, maybe 80 to 100 ohm, 10W or so.

Then finish the alignment.
People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.
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Messages In This Thread
Zenith TO H500 - by morzh - 12-15-2018, 11:28 PM
RE: Zenith TO H500 - by sam - 12-16-2018, 06:46 PM
RE: Zenith TO H500 - by morzh - 12-16-2018, 08:26 PM
RE: Zenith TO H500 - by Arran - 12-17-2018, 05:02 AM
RE: Zenith TO H500 - by morzh - 12-17-2018, 10:34 AM
RE: Zenith TO H500 - by morzh - 12-17-2018, 01:05 PM
RE: Zenith TO H500 - by jcassity - 12-17-2018, 01:29 PM
RE: Zenith TO H500 - by morzh - 12-17-2018, 04:32 PM
RE: Zenith TO H500 - by EdHolland - 12-17-2018, 05:01 PM
RE: Zenith TO H500 - by morzh - 12-17-2018, 09:29 PM
RE: Zenith TO H500 - by EdHolland - 12-17-2018, 09:33 PM
RE: Zenith TO H500 - by morzh - 12-17-2018, 09:54 PM
RE: Zenith TO H500 - by morzh - 12-18-2018, 05:18 PM
RE: Zenith TO H500 - by sam - 12-18-2018, 05:46 PM
RE: Zenith TO H500 - by morzh - 12-18-2018, 06:16 PM
RE: Zenith TO H500 - by morzh - 01-06-2019, 11:11 PM
RE: Zenith TO H500 - by Arran - 01-07-2019, 01:41 AM
RE: Zenith TO H500 - by morzh - 01-07-2019, 11:30 AM
RE: Zenith TO H500 - by morzh - 01-12-2019, 11:20 PM
RE: Zenith TO H500 - by morzh - 01-13-2019, 07:27 PM



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  1. The PHILCO Phorum
  2. Various and Sundry Categories
  3. Other Radios (Non-Philco)