37-650 buzzing

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37-650 buzzing

Ron Ramirez
Silent Key

Posts: 13,776
Threads: 580
Joined: Sep 2005
City: Ferdinand State, Province, Country: Indiana

#14

01-27-2011, 09:00 PM

Another thing to check for that I forgot to mention: poor ground connections. Philco often connected wires to chassis ground through a riveted connection, and corrosion can build up in the chassis hole where the rivet is. You may not see the corrosion but it is there, making ground connections go intermittent or bad altogether.

By the schematic, you should measure 138 ohms across resistor 58 (between B- and ground). If you are reading 143 ohms (not 0.143 ohm), that is close enough.

You should not read more than 138 (143?) ohms across electrolytic 59...the resistance of resistor 58.

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Ron Ramirez
Ferdinand IN

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37-650 buzzing - by wil - 01-23-2011, 12:15 PM

Re: 37-650 buzzing - by Ron Ramirez - 01-23-2011, 10:07 PM

Re: 37-650 buzzing - by wil - 01-24-2011, 01:14 PM

Re: 37-650 buzzing - by Ron Ramirez - 01-24-2011, 05:21 PM

Re: 37-650 buzzing - by philcoradio1234 - 01-24-2011, 07:32 PM

Re: 37-650 buzzing - by Ron Ramirez - 01-24-2011, 08:03 PM

Re: 37-650 buzzing - by wil - 01-25-2011, 11:04 AM

Re: 37-650 buzzing - by Ron Ramirez - 01-25-2011, 11:24 AM

Re: 37-650 buzzing - by wil - 01-25-2011, 05:08 PM

Re: 37-650 buzzing - by Ron Ramirez - 01-25-2011, 05:20 PM

Re: 37-650 buzzing - by wil - 01-26-2011, 03:16 PM

Re: 37-650 buzzing - by Ron Ramirez - 01-26-2011, 07:46 PM

Re: 37-650 buzzing - by wil - 01-27-2011, 06:56 PM

Re: 37-650 buzzing - by Ron Ramirez - 01-27-2011, 09:00 PM

Re: 37-650 buzzing - by wil - 02-03-2011, 04:14 PM

Re: 37-650 buzzing - by Ron Ramirez - 02-03-2011, 08:06 PM

Re: 37-650 buzzing - by wil - 02-05-2011, 01:05 PM

Re: 37-650 buzzing - by Ron Ramirez - 02-06-2011, 01:42 AM

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