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Philco 70
#11

Ok, maybe the osc. coil is defective, but why does it test good and why do I have good grid voltage at all frequencies? I just noticed one other thing. While I have great volume, over the dial, I find that it is slightly difficult to tune in a strong station because the tuning is broad. I can turn the dial through about a 30 Khz range on strong stations. I suspect that the oscillator is working correctly, however maybe not at the correct frequency, because the average super has about -5 to -25 volts on the osc grid. On mine the grid, using a VTVM reads between -21 to -25V throughout the tuning range. Yes, a scope or frequency counter would help, but those I no longer own. The oscillator is definitely working. Correct frequency???


Messages In This Thread
Philco 70 - by Tubesforme - 03-26-2017, 06:22 PM
RE: Philco 70 - by Radioroslyn - 03-26-2017, 07:49 PM
RE: Philco 70 - by Tubesforme - 03-27-2017, 07:31 PM
RE: Philco 70 - by Tubesforme - 03-27-2017, 09:09 PM
RE: Philco 70 - by morzh - 03-26-2017, 07:50 PM
RE: Philco 70 - by Tubesforme - 03-27-2017, 02:15 PM
RE: Philco 70 - by Tubesforme - 03-27-2017, 09:06 PM
RE: Philco 70 - by Radioroslyn - 03-26-2017, 08:43 PM
RE: Philco 70 - by Tubesforme - 03-27-2017, 02:07 PM
RE: Philco 70 - by Tubesforme - 03-27-2017, 02:28 PM
RE: Philco 70 - by Radioroslyn - 03-27-2017, 03:22 PM
RE: Philco 70 - by Tubesforme - 03-27-2017, 04:04 PM
RE: Philco 70 - by Tubesforme - 04-06-2017, 02:02 PM
RE: Philco 70 - by Radioroslyn - 03-27-2017, 04:08 PM
RE: Philco 70 - by Tubesforme - 03-27-2017, 07:26 PM



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