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38-116 Code 121 Powering Up Help
#7

(07-17-2017, 09:47 AM)morzh Wrote:  Terry

From what I read I figured he had the speaker in as he said "--there is no noise from the speaker - not even a hum. " Icon_smile
This is why I did not ask.
Mike you forget I'm lisdexsic!!![Image: http://philcoradio.com/phorum/images/smi...on_eek.gif]

Andy, I would poke around w/ your voltmeter and measure the from chassis to pin 3 of the 6L6's (should see abt 275-300vthere). Check both separately. If not opt is open or not wired correctly . Also check the voltage on pin 5 of the 6L6's ( should see -16 to -20vdc). If not secondary of driver/interstage transformer is open or miss wired. Where the - voltage isn't present and the high voltage is on the 6L6's it causes them to draw excessive current which might be why your hv is reading low. Not having HV on pin 3 is not great, when there is hv on pin 4. 3 and 4 should be fairly close in voltage.
Obtw on #140 the 10mfd cap has the + side connects to the chassis and - goes to the - of the 8mfd. It filters the bias voltage. If you wired it w/the - to the chassis(backwards) it will kill off the -voltage in the set.

When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got!

Terry


Messages In This Thread
38-116 Code 121 Powering Up Help - by AVSorrell - 07-17-2017, 08:12 AM
RE: 38-116 Code 121 Powering Up Help - by morzh - 07-17-2017, 08:21 AM
RE: 38-116 Code 121 Powering Up Help - by morzh - 07-17-2017, 09:47 AM
RE: 38-116 Code 121 Powering Up Help - by Radioroslyn - 07-17-2017, 11:46 AM
RE: 38-116 Code 121 Powering Up Help - by morzh - 07-18-2017, 08:57 AM
RE: 38-116 Code 121 Powering Up Help - by morzh - 07-18-2017, 12:05 PM
RE: 38-116 Code 121 Powering Up Help - by morzh - 07-19-2017, 09:08 AM
RE: 38-116 Code 121 Powering Up Help - by morzh - 07-30-2017, 02:49 PM
RE: 38-116 Code 121 Powering Up Help - by morzh - 07-30-2017, 08:10 PM
RE: 38-116 Code 121 Powering Up Help - by morzh - 07-31-2017, 08:42 AM
RE: 38-116 Code 121 Powering Up Help - by morzh - 07-31-2017, 01:27 PM
RE: 38-116 Code 121 Powering Up Help - by Chris h - 09-26-2017, 01:19 PM



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