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Philco 71 restoration
#20

I made some progress tonight. Some of the resistors I left in were actually way high in value 30-50% high. I swapped the resistors out and put the volume control back in and powered it up. At first I got nothing but that annoying crackling in the speaker which was controlable with the volume control which told me that the output was working.

I started probing around with my tracer on RF and got RF on the RF tube, OSC and IF tubes no audio anywhere. I could hear the crackling in my tracer also. Then I touched the cathode of the 36 again and I heard a loud buzz in the speaker then it started to receive stations. Maybe touching that kick started the OSC? It plays ok has lots of noise (static) and the sound completly drops out every now and then and I can then touch the grip cap of the 36 tube and it starts playing again. 36 tube gone wonky? It tested good.

When it is playing it goes dead when tuned lower then mid 900's (550 - about 940 or so) just get a strange buzzing noise.

Still havent checked voltages ill do that tomorrow. Another wierd thing I noticed when the radio was playing I could not tune another radio to hear the OSC running. It had to be running if its tuning in stations so whats up with that?

Issues still working through:
1. Crackling sound
2. Sound droping out and no audio on tubes until 36 tube pins touched
3. Lots of static when radio is playing
4. cant tune lower then ~940 on the dial.

-Keith


Messages In This Thread
Philco 71 restoration - by ipwizard - 09-28-2011, 11:48 PM
RE: Philco 71 restoration - by ipwizard - 03-02-2012, 05:09 PM
Re: Man this thing is a nightmare - by ipwizard - 09-29-2011, 12:36 AM
Re: Man this thing is a nightmare - by ipwizard - 09-29-2011, 09:14 PM
Re: Man this thing is a nightmare - by ipwizard - 10-05-2011, 11:29 PM
Re: Man this thing is a nightmare - by Arran - 10-06-2011, 01:24 AM
Re: Man this thing is a nightmare - by rghines1 - 10-06-2011, 09:20 AM
Re: Man this thing is a nightmare - by exray - 10-06-2011, 11:41 AM
Re: Man this thing is a nightmare - by ipwizard - 10-08-2011, 09:34 PM
Re: Man this thing is a nightmare - by Marsupial - 10-08-2011, 10:52 PM
Re: Man this thing is a nightmare - by exray - 10-09-2011, 04:56 AM
Re: Man this thing is a nightmare - by ipwizard - 10-10-2011, 12:40 PM
Re: Philco 71 restoration - by ipwizard - 10-31-2011, 04:10 PM
Re: Philco 71 restoration - by 7estatdef - 10-31-2011, 07:48 PM
Re: Philco 71 restoration - by 7estatdef - 10-31-2011, 08:00 PM
Re: Philco 71 restoration - by ipwizard - 11-01-2011, 12:03 AM
Re: Philco 71 restoration - by ipwizard - 11-01-2011, 12:06 AM
Re: Philco 71 restoration - by 7estatdef - 11-01-2011, 09:58 PM
Re: Philco 71 restoration - by ipwizard - 11-03-2011, 12:03 AM
Re: Philco 71 restoration - by 7estatdef - 11-03-2011, 01:59 AM
Re: Philco 71 restoration - by codefox1 - 11-03-2011, 09:04 AM
Re: Philco 71 restoration - by ipwizard - 11-03-2011, 05:00 PM
Re: Philco 71 restoration - by 7estatdef - 11-03-2011, 05:26 PM
Re: Philco 71 restoration - by ipwizard - 11-03-2011, 05:31 PM
Re: Philco 71 restoration - by 7estatdef - 11-03-2011, 05:42 PM
Re: Philco 71 restoration - by ipwizard - 11-03-2011, 06:40 PM
Re: Philco 71 restoration - by 7estatdef - 11-03-2011, 07:39 PM
Re: Philco 71 restoration - by ipwizard - 11-03-2011, 08:38 PM
Re: Philco 71 restoration - by ipwizard - 11-03-2011, 11:29 PM
Re: Philco 71 restoration - by ipwizard - 11-04-2011, 01:33 PM
Re: Philco 71 restoration - by ipwizard - 11-30-2011, 10:56 PM
Re: Philco 71 restoration - by TA Forbes - 11-30-2011, 11:37 PM
Re: Philco 71 restoration - by TA Forbes - 12-02-2011, 08:54 PM
Re: Philco 71 restoration - by codefox1 - 12-03-2011, 10:48 AM
Re: Philco 71 restoration - by ipwizard - 12-04-2011, 02:03 PM
Re: Philco 71 restoration - by ipwizard - 12-23-2011, 03:36 AM



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