Another 7G605 Zenith TO

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Another 7G605 Zenith TO

morzh
Odobenus rosmarus

Posts: 15,813
Threads: 553
Joined: Oct 2011
City: Jackson, NJ

#65

05-16-2019, 08:28 PM

Yesterday I decided to investigate the issue of the crackles while tuning. To remind, it only showed on BC band and only between 1200 to 1600 kHz.

I took the tuning cap out and gave it a good bubble bath with soft long brush between the vanes, then dried with heat gun on low.
Then left overnight and today I connected it to a doubling rectifier via resistor 30K.
I put the voltmeter across the plates and turned it on. I did all three sections one by one while turning the rotor.
No sparks or jumping voltmeter value, meaning no shorts and no burning debris.
I also didn't expect the crackles to be the result of the bad wipers contact to the rotor as there are 4 of them - no chance of such repeatability.

So....put it back, turned it on......no crackles anymore.
Put the dial back, then the pointer....same, no more crackles.
I will have to realign the bands.

Mystery.

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

Another 7G605 Zenith TO - by morzh - 03-17-2019, 07:01 PM

RE: Another 7G605 Zenith TO - by EdHolland - 03-18-2019, 10:52 PM

RE: Another 7G605 Zenith TO - by morzh - 03-18-2019, 11:34 PM

RE: Another 7G605 Zenith TO - by EdHolland - 03-19-2019, 11:56 AM

RE: Another 7G605 Zenith TO - by morzh - 03-19-2019, 01:17 PM

RE: Another 7G605 Zenith TO - by morzh - 03-23-2019, 05:50 PM

RE: Another 7G605 Zenith TO - by Eliot Ness - 03-23-2019, 06:14 PM

RE: Another 7G605 Zenith TO - by morzh - 03-23-2019, 08:18 PM

RE: Another 7G605 Zenith TO - by WyTex - 03-24-2019, 06:58 AM

RE: Another 7G605 Zenith TO - by morzh - 03-24-2019, 10:20 AM

RE: Another 7G605 Zenith TO - by EdHolland - 03-24-2019, 10:38 AM

RE: Another 7G605 Zenith TO - by Ron Ramirez - 03-24-2019, 11:32 AM

RE: Another 7G605 Zenith TO - by Paul Philco322 - 03-24-2019, 11:37 AM

RE: Another 7G605 Zenith TO - by morzh - 03-24-2019, 12:15 PM

RE: Another 7G605 Zenith TO - by Phlogiston - 03-24-2019, 01:07 PM

RE: Another 7G605 Zenith TO - by morzh - 03-24-2019, 02:15 PM

RE: Another 7G605 Zenith TO - by morzh - 03-24-2019, 06:14 PM

RE: Another 7G605 Zenith TO - by morzh - 03-27-2019, 11:19 AM

RE: Another 7G605 Zenith TO - by morzh - 03-27-2019, 09:13 PM

RE: Another 7G605 Zenith TO - by radiohenry - 03-28-2019, 09:39 PM

RE: Another 7G605 Zenith TO - by morzh - 03-29-2019, 09:36 AM

RE: Another 7G605 Zenith TO - by TV MAN - 03-29-2019, 09:56 AM

RE: Another 7G605 Zenith TO - by morzh - 03-29-2019, 11:01 AM

RE: Another 7G605 Zenith TO - by morzh - 04-02-2019, 09:56 AM

RE: Another 7G605 Zenith TO - by morzh - 04-02-2019, 07:37 PM

RE: Another 7G605 Zenith TO - by morzh - 04-02-2019, 07:41 PM

RE: Another 7G605 Zenith TO - by Ron Ramirez - 04-02-2019, 09:38 PM

RE: Another 7G605 Zenith TO - by morzh - 04-02-2019, 10:29 PM

RE: Another 7G605 Zenith TO - by Ron Ramirez - 04-03-2019, 06:01 AM

RE: Another 7G605 Zenith TO - by Eliot Ness - 04-03-2019, 07:46 AM

RE: Another 7G605 Zenith TO - by morzh - 04-03-2019, 08:47 AM

RE: Another 7G605 Zenith TO - by morzh - 04-03-2019, 09:20 PM

RE: Another 7G605 Zenith TO - by morzh - 04-05-2019, 08:54 PM

RE: Another 7G605 Zenith TO - by morzh - 04-07-2019, 05:47 PM

RE: Another 7G605 Zenith TO - by morzh - 04-09-2019, 07:37 PM

RE: Another 7G605 Zenith TO - by morzh - 04-10-2019, 03:11 PM

RE: Another 7G605 Zenith TO - by WyTex - 04-10-2019, 04:09 PM

RE: Another 7G605 Zenith TO - by morzh - 04-10-2019, 04:48 PM

RE: Another 7G605 Zenith TO - by morzh - 04-10-2019, 09:03 PM

RE: Another 7G605 Zenith TO - by morzh - 04-14-2019, 05:13 PM

RE: Another 7G605 Zenith TO - by morzh - 04-18-2019, 02:59 PM

RE: Another 7G605 Zenith TO - by morzh - 04-22-2019, 01:36 PM

RE: Another 7G605 Zenith TO - by Eliot Ness - 04-22-2019, 02:34 PM

RE: Another 7G605 Zenith TO - by morzh - 04-22-2019, 04:35 PM

RE: Another 7G605 Zenith TO - by Eliot Ness - 04-22-2019, 06:07 PM

RE: Another 7G605 Zenith TO - by morzh - 04-22-2019, 10:49 PM

RE: Another 7G605 Zenith TO - by morzh - 04-23-2019, 07:59 PM

RE: Another 7G605 Zenith TO - by morzh - 04-24-2019, 02:05 PM

RE: Another 7G605 Zenith TO - by morzh - 04-25-2019, 08:28 PM

RE: Another 7G605 Zenith TO - by morzh - 04-28-2019, 06:57 PM

RE: Another 7G605 Zenith TO - by WyTex - 04-29-2019, 07:09 AM

RE: Another 7G605 Zenith TO - by morzh - 04-29-2019, 08:07 AM

RE: Another 7G605 Zenith TO - by morzh - 04-30-2019, 09:26 PM

RE: Another 7G605 Zenith TO - by EdHolland - 04-30-2019, 10:06 PM

RE: Another 7G605 Zenith TO - by WyTex - 05-01-2019, 11:54 AM

RE: Another 7G605 Zenith TO - by morzh - 05-01-2019, 01:51 PM

RE: Another 7G605 Zenith TO - by Eliot Ness - 05-01-2019, 02:08 PM

RE: Another 7G605 Zenith TO - by morzh - 05-06-2019, 09:33 AM

RE: Another 7G605 Zenith TO - by KCMike - 05-06-2019, 09:59 AM

RE: Another 7G605 Zenith TO - by morzh - 05-06-2019, 10:44 AM

RE: Another 7G605 Zenith TO - by morzh - 05-15-2019, 08:30 PM

RE: Another 7G605 Zenith TO - by jake wells - 05-15-2019, 11:50 PM

RE: Another 7G605 Zenith TO - by morzh - 05-16-2019, 07:50 AM

RE: Another 7G605 Zenith TO - by morzh - 05-16-2019, 08:28 PM

RE: Another 7G605 Zenith TO - by rfeenstra - 05-17-2019, 12:29 AM

RE: Another 7G605 Zenith TO - by Eliot Ness - 05-17-2019, 07:19 AM

RE: Another 7G605 Zenith TO - by morzh - 05-17-2019, 09:00 AM

RE: Another 7G605 Zenith TO - by morzh - 05-24-2019, 10:51 AM

RE: Another 7G605 Zenith TO - by morzh - 05-25-2019, 10:03 PM

RE: Another 7G605 Zenith TO - by morzh - 05-26-2019, 03:01 PM

RE: Another 7G605 Zenith TO - by Eliot Ness - 05-26-2019, 06:33 PM

RE: Another 7G605 Zenith TO - by morzh - 05-26-2019, 06:57 PM

RE: Another 7G605 Zenith TO - by morzh - 05-27-2019, 08:51 PM

RE: Another 7G605 Zenith TO - by KCMike - 05-27-2019, 08:55 PM

RE: Another 7G605 Zenith TO - by morzh - 05-27-2019, 09:29 PM

RE: Another 7G605 Zenith TO - by EdHolland - 06-01-2019, 11:18 PM

RE: Another 7G605 Zenith TO - by morzh - 06-02-2019, 10:01 AM

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