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Advice on Philco 70A basket case
retiredinprescott
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Posts: 57
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Joined: Feb 2009
City: Prescott AZ
#1

11-13-2011, 04:31 PM
I am starting on a Philco 70A (serial number: 152093, no letter B). Circuit has been messed with but circuit layout and tube layout seems to match 70-A Below B-22000.

I have a couple of questions to get me started:
1. Original speaker is trashed. Shredded field coil, bad output transformer. I'm thinking I'm going to have to use an 8" PM speaker that I have along with a roughly 3000 ohm 10-20 watt resistor to replace the field coil. Perhaps eventually I'll find a Philco 70 speaker.

2. The power transfomer for a 70-A is supposed to be for 25-40 cycle current. Do I have to worry about using it with our 60 cycle current?
Thanks for you help in getting me started on this project.
Mark
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Messages In This Thread
Advice on Philco 70A basket case - by retiredinprescott - 11-13-2011, 04:31 PM
Re: Advice on Philco 70A basket case - by morzh - 11-15-2011, 12:08 PM
Re: Advice on Philco 70A basket case - by Arran - 11-20-2011, 01:19 AM



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