Welcome Guest! Be sure you know and follow the Phorum Rules before posting. Thank you and Enjoy! (January 12) x

Thread Closed
Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5

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



Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
Restoration of the Canadian General Electric A-87
Great job on the cabinet. PS. In the US notation, "kenotron" refers to specific type of tubes; we call re...morzh — 08:24 AM
Part numbers to model cross
This document has at least some tables of models and parts used. Example: Choke 32-7572, used in 604 radio. S...morzh — 08:19 AM
Restoration of the Canadian General Electric A-87
I also checked all the radio tubes on my Hickok 530 tube tester. The 5Z3 kenotron turned out to be faulty, all the other...RadioSvit — 08:02 AM
Restoration of the Canadian General Electric A-87
Well... While the varnish is drying up, I started repairing the chassis... Of course I started by replacing the pa...RadioSvit — 07:12 AM
Philco Model 38-7: what caps & resistors do fail typically?
Hello Martin, Welcome aboard our little community what great Model 38-7 Sincerely Richardradiorich — 12:30 AM
Philco Model 38-7: what caps & resistors do fail typically?
Welcome to the Phorum Martin. I count about 9 paper caps, the 3 electrolytic caps and 2-Y2 safety caps to replace th...RodB — 09:44 PM
Part numbers to model cross
Jim, We have this index put together by Dale Cook but I don't think that is quite what you are looking for. The Parts...klondike98 — 09:37 PM
Philco Model 38-7: what caps & resistors do fail typically?
Yep the dim bulb test is OK but I'd definitely replace all those electrolytics before I did it. Since those #47 conden...klondike98 — 09:18 PM
Philco 42-345 Restoration/Repair
The resistor is a 2.2 Meg, it was the last one I hadn't replaced. The broadcast is coming in after replacing it.osanders0311 — 09:09 PM
Philco 42-345 Restoration/Repair
What does the resistor measure? I think it should be 3.3 Meg. If the oscillator coil has continuity and the resistanc...RodB — 09:03 PM

[-]
Who's Online
There are currently 1313 online users. [Complete List]
» 1 Member(s) | 1312 Guest(s)
Avatar

>