removed cap, lost radio on my 41-608
Posts: 8
Threads: 1
Joined: Mar 2015
City: Ohio
Hello all, I sure hope I can get some help. While restoring my new Philco 41-608 i was cleaning the pots I noticed that there was a crackle and volume change whenever I touched a .002 MFD wax cap connected to the volume pot. I am a complete noobie when it comes to vintage electronic repair but I am familiar with guitars and their tone circuits. Decided to remove the capacitor that was causing the vol/crack issue. Wired it back with straight wire. Thing sounds amazing now! But the radio which worked fine now doesn't even try to work. My question is did my radio function Dependant on that missing cap? I also replaced the power wire out to the wall socket. Contact cleaner cleansed everything. The phono works. The iPod jack I wired to the phono preamp works and everything sounds great! The antenna is connected but nothing on the radio side works. Any help will help!
Posts: 15,444
Threads: 539
Joined: Oct 2011
City: Jackson, NJ
http://www.nostalgiaair.org/PagesByModel...013433.pdf
Is this the sch?
What is the cap's position number? Is it #56?
Does your "wired with straight wire" mean you shorted the wire across where the cap was before?
If yes,
PS. It benefits everybody not to touch and mod circuitry one does not uderstand how it works. First understand it, then try to fix it.
People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.
(This post was last modified: 03-01-2015, 09:48 PM by morzh.)
Posts: 8
Threads: 1
Joined: Mar 2015
City: Ohio
(03-01-2015, 09:45 PM)morzh Wrote: What is the cap's position number? Is it #56?
YES its that one into the resistor. Kept the resistor
Quote:Does your "wired with straight wire" mean you shorted the wire across where the cap was before?
YES! Thats what I did.
Quote:It benefits everybody not to touch and mod circuitry one does not uderstand how it works. First understand it, then try to fix it.
Good advice, I didn't know what I don't know. Thought i understood the circuit. Thought won't
Posts: 15,444
Threads: 539
Joined: Oct 2011
City: Jackson, NJ
Well...funny thing, shorting this cap should not kill rection, it is same as moving tone control pot to the High-most position.
Try to see if when you actually move it to that position the reception restores.
People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.
Posts: 5,060
Threads: 269
Joined: Nov 2012
City: Bandon
State, Province, Country: OR
Welcome to the Phorum!! If you are interested in vintage radio restoration, take some time to read first. Here's a start but there is lots of info in this Phorum, the associated PhilcoRadio.com site and on the web. A place to find parts is here http://www.philcoradio.com/resourceb.htm . If the radio has not had the wax and electrolytic caps replaced, it would be good to do so as they will likely fail with continued use. As to the radio working before you jumped the #56 cap but not after, you could replace the cap with a new one and see if the radio recovers but I'd replace all the caps and at least check the resistors and replace those that are > 20% high. If it doesn't recover....others will be better at troubleshooting the radio than me.
Posts: 8
Threads: 1
Joined: Mar 2015
City: Ohio
Trying that I can hear it trying to tune stations... Ordered sone replacement caps. You think my function selector switch being bad would cause my reception issue?
Posts: 15,444
Threads: 539
Joined: Oct 2011
City: Jackson, NJ
You need to do a full recap first.
Here's the scenario: your shorted to GND path across the removed cap would behave as high tone position but then when you have the pot in the low tone position, should your #65 leak, you will lose the sound or major part of it.
Recap is the start of just about every restoration. Do it first.
Many problems will disappear before you will do something that they can manifest.
People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.
Posts: 8
Threads: 1
Joined: Mar 2015
City: Ohio
Wow thanks to both of you. I'm in love with this radio console. Will preform a full recap, test all resistors. No the caps I bought are 600v .002 MFD. As long as the voltage rating is as high or higher I should be OK right?
Posts: 15,444
Threads: 539
Joined: Oct 2011
City: Jackson, NJ
Generally, yes.
People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.
Posts: 8
Threads: 1
Joined: Mar 2015
City: Ohio
Posts: 15,444
Threads: 539
Joined: Oct 2011
City: Jackson, NJ
Are these the ones you took out?
Or?
If these are new old stock you bought, do not use them.
People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.
Posts: 5,060
Threads: 269
Joined: Nov 2012
City: Bandon
State, Province, Country: OR
+1 on what morzh said. Old paper and wax caps, even though unused, are not reliable. You can get new caps easily enough from the resource list I mentioned before http://www.philcoradio.com/resourceb.htm#n . morzh usually buys from Mouser. I buy from Radio Daze and Antique Electronic Supply.
Posts: 15,444
Threads: 539
Joined: Oct 2011
City: Jackson, NJ
And if you want them to look right, buy the tube axial types and stuff them inide the old ones, you can reserve the old wires and use them.
People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.
Posts: 2,128
Threads: 18
Joined: Oct 2008
City: Merrick, Long Island, NY
Agree, the caps in the picturre you posted are about 50 years old!
Posts: 15,444
Threads: 539
Joined: Oct 2011
City: Jackson, NJ
...and even if built yesterday, paper caps, now that we know of their problems, should be avoided altogether. Not that I know of any built yesterday...I think they no longer make'em. Film caps are the supplanter.
People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.
Users browsing this thread: 2 Guest(s)
|
Recent Posts
|
Rare zenith 6s137 restore
|
All of these restorations are two projects. The chassis and the cabinet. You're done with the chassis.
I would keep ...RodB — 01:29 PM |
PT-6 antenna connections
|
Thanks. The transformer tested per your numbers. Checked the wiring and it appears to be good. I’ll move on to checking ...bridkarl — 12:37 PM |
GE Model P-975F
|
There are 2 of these on ePay and several pics on Radiomuseum. Although the front looks like a very popular Hong Kong ra...MrFixr55 — 09:26 AM |
Rare zenith 6s137 restore
|
Hi Fred,
I get things to work, but what you, Russ, RadioSvit and many others on the Phorum do with cabinet and chassis...MrFixr55 — 09:02 AM |
PT-6 antenna connections
|
Hi Bridcarl
+1 on the others. Pin 6 of the 7C6 is the AVC Diode so it is appropriate that that pin 4 of the coil con...MrFixr55 — 07:30 AM |
462ron
|
Joseph, this is beyond awesome. A lot of thought and engineering went into this and you hit a home run! Now I must save ...462ron — 07:27 AM |
Cannot Adjust an IF Transformer’s cores
|
Outstanding work indeed. I wish I could come up with solutions like this.slford310 — 11:16 PM |
Cannot Adjust an IF Transformer’s cores
|
The abilities of our 'Phorum Pholks" never ceases to amaze me! Fantastic fabrication, Joseph! I'm waiting now for...GarySP — 08:27 PM |
PT-6 antenna connections
|
Thanks. I never realized that was a notch noted in the schematic as described. I’ll recheck my wiring.bridkarl — 08:13 PM |
Cannot Adjust an IF Transformer’s cores
|
Thank you! I was quite new to the Phorum when I started this post, so I feel like it might be advantageous to publish a ...jrblasde — 08:07 PM |
Who's Online
|
There are currently no members online. |
|
![>](https://philcoradio.com/phorum/images/bootbb/asb/right_arrow.png)
|