Philco 90 Restoration

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Philco 90 Restoration

Steve Davis
Phorum Expert

Posts: 1,397
Threads: 69
Joined: Oct 2007
City: Linn Creek, MO

#39

12-19-2019, 04:47 PM

I have a NOS Philco output transformer p/n 32-7078 as used on the K-17 and H-13 speakers. Using a variac, I determined the turns ratio to be about 65:1 that gives an impedance ratio of about 4525:1. Pretty low considering the .62 ohm impedance of the K-5 voice coil. I just happened to have an 8 ohm coil the right diameter but, the thing is to long. Also 8 ohms is a little too much.
[Image: https://live.staticflickr.com/65535/4924...6a02_k.jpg]100_0204 by Steve Davis, on Flickr

So, I removed about one half the turns and shortened the coil form.
[Image: https://live.staticflickr.com/65535/4924...a38d_k.jpg]100_0206 by Steve Davis, on Flickr

Steve

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Messages In This Thread

Philco 90 Restoration - by Steve Davis - 12-03-2019, 12:15 PM

RE: Philco 90 Restoration - by Steve Davis - 12-03-2019, 06:10 PM

RE: Philco 90 Restoration - by KCMike - 12-03-2019, 07:11 PM

RE: Philco 90 Restoration - by Ron Ramirez - 12-03-2019, 09:31 PM

RE: Philco 90 Restoration - by rfeenstra - 12-03-2019, 09:43 PM

RE: Philco 90 Restoration - by Steve Davis - 12-03-2019, 09:58 PM

RE: Philco 90 Restoration - by jake wells - 12-03-2019, 10:19 PM

RE: Philco 90 Restoration - by rfeenstra - 12-03-2019, 10:32 PM

RE: Philco 90 Restoration - by Steve Davis - 12-03-2019, 10:37 PM

RE: Philco 90 Restoration - by jake wells - 12-04-2019, 06:26 AM

RE: Philco 90 Restoration - by Steve Davis - 12-04-2019, 08:57 AM

RE: Philco 90 Restoration - by Steve Davis - 12-04-2019, 06:03 PM

RE: Philco 90 Restoration - by Steve Davis - 12-04-2019, 06:20 PM

RE: Philco 90 Restoration - by jake wells - 12-04-2019, 06:21 PM

RE: Philco 90 Restoration - by Steve Davis - 12-05-2019, 01:49 PM

RE: Philco 90 Restoration - by jake wells - 12-05-2019, 04:18 PM

RE: Philco 90 Restoration - by Steve Davis - 12-05-2019, 08:44 PM

RE: Philco 90 Restoration - by jake wells - 12-05-2019, 09:27 PM

RE: Philco 90 Restoration - by Steve Davis - 12-11-2019, 01:41 PM

RE: Philco 90 Restoration - by Jake Blake - 12-11-2019, 02:06 PM

RE: Philco 90 Restoration - by Steve Davis - 12-11-2019, 02:36 PM

RE: Philco 90 Restoration - by Jake Blake - 12-11-2019, 02:39 PM

RE: Philco 90 Restoration - by Steve Davis - 12-11-2019, 03:12 PM

RE: Philco 90 Restoration - by Steve Davis - 12-11-2019, 10:16 PM

RE: Philco 90 Restoration - by Steve Davis - 12-11-2019, 10:31 PM

RE: Philco 90 Restoration - by 462ron - 12-12-2019, 07:48 AM

RE: Philco 90 Restoration - by Steve Davis - 12-12-2019, 10:43 AM

RE: Philco 90 Restoration - by Kestas - 12-12-2019, 02:34 PM

RE: Philco 90 Restoration - by Steve Davis - 12-13-2019, 09:14 PM

RE: Philco 90 Restoration - by Jake Blake - 12-13-2019, 09:24 PM

RE: Philco 90 Restoration - by Ron Ramirez - 12-13-2019, 09:26 PM

RE: Philco 90 Restoration - by Ron Ramirez - 12-13-2019, 09:27 PM

RE: Philco 90 Restoration - by Jake Blake - 12-13-2019, 09:29 PM

RE: Philco 90 Restoration - by Steve Davis - 12-13-2019, 09:55 PM

RE: Philco 90 Restoration - by Steve Davis - 12-16-2019, 10:03 PM

RE: Philco 90 Restoration - by Steve Davis - 12-19-2019, 12:32 PM

RE: Philco 90 Restoration - by Steve Davis - 12-19-2019, 04:01 PM

RE: Philco 90 Restoration - by rfeenstra - 12-19-2019, 04:23 PM

RE: Philco 90 Restoration - by Steve Davis - 12-19-2019, 04:47 PM

RE: Philco 90 Restoration - by Steve Davis - 12-19-2019, 05:17 PM

RE: Philco 90 Restoration - by Steve Davis - 12-19-2019, 06:26 PM

RE: Philco 90 Restoration - by Phlogiston - 12-19-2019, 06:33 PM

RE: Philco 90 Restoration - by Steve Davis - 12-19-2019, 06:56 PM

RE: Philco 90 Restoration - by Steve Davis - 12-24-2019, 10:59 AM

RE: Philco 90 Restoration - by morzh - 12-24-2019, 11:15 AM

RE: Philco 90 Restoration - by rfeenstra - 12-24-2019, 12:07 PM

RE: Philco 90 Restoration - by Steve Davis - 12-24-2019, 01:51 PM

RE: Philco 90 Restoration - by rfeenstra - 12-30-2019, 04:58 PM

RE: Philco 90 Restoration - by Steve Davis - 12-30-2019, 10:40 PM

RE: Philco 90 Restoration - by Steve Davis - 01-03-2020, 08:03 PM

RE: Philco 90 Restoration - by Simon Wa3uay - 01-03-2020, 08:07 PM

RE: Philco 90 Restoration - by Jake Blake - 01-03-2020, 09:32 PM

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