crazy issue 41-604 works fine with dim bulb
Posts: 1,835
Threads: 117
Joined: May 2008
City: Omak
State, Province, Country: WA
Hello Guys,
One of the guys I know in our hobby is having problems with his newly restored Philco 41-604 when he brings it up on full line voltage the set starts acting up but if he runs it on Dim bulb it works just fine . https://philcoradio.com/library/download...20Book.pdf
Anyway Ideas .
Sincerely Richard
Posts: 4,859
Threads: 54
Joined: Sep 2008
City: Sandwick, BC, CA
Define acting up? It looks like an AC/DC set judging by the diagram. I'm really just shooting in the dark here without having an idea of what is going on, but if all the capacitors have been replaced, correct values, correct voltage ratings, in the correct places, then it could be something like a gassy tube, or secondary emission from a grid. It also could be that a carbon comp resistor is failing, more voltage, more heat, and the connection inside is breaking down.
Regards
Arran
(This post was last modified: 11-06-2023, 03:03 AM by Arran.)
Posts: 1,835
Threads: 117
Joined: May 2008
City: Omak
State, Province, Country: WA
Hello Arran,
Yes He replaced all the capacitors !
Sincerely Richard
Posts: 16,476
Threads: 573
Joined: Oct 2011
City: Jackson
State, Province, Country: NJ
Rich
I will repeat Arrans request:
- Define "acting up".
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: 1,835
Threads: 117
Joined: May 2008
City: Omak
State, Province, Country: WA
Hello Arran and Morzh,
Here is what he wrote me " By act up, I mean it squeals and distorts between strong stations. Also, I have a strong station that shows up at multiple different frequencies."
he just ordered an NOS 7C6 tube because the original tube seems to have an intermittent issue.
Sincerely Richard
Posts: 713
Threads: 8
Joined: Apr 2018
City: S. Dartmouth
State, Province, Country: MA
Quote:By act up, I mean it squeals and distorts between strong stations. Also, I have a strong station that shows up at multiple different frequencies."
I would look to miss connections, wrong cap/resistor values, shorts between terminals, solder blobs, wire snips, solder flowed between tube wafer contacts, poor riveted joints to chassis, even if the "best ohmmeter" says the joint is O.K. There could be corrosion issues with the coils, if resistance readings are higher, then there is a problem. The band switch must be cleaned with 91% alcohol and gently blown dry, use of "miracle" contact cleaners can result in leakage. Poor connections in the band switch could also be a possibility...
Re-wiring and not following the route of the original wires, especially in the RF/OSC and around the volume control, missing tube shield(s).
Overall, if the "shotgun method" was used to refurbish, that, in of itself, is responsible for the outcome.
It generally takes stage by stage analysis after eliminating a power supply issue if any to recover from cited issues.
Poking the chassis components with a tongue depressor, with set in operation, will often reveal oscillations occurring from juxtaposition.
GL
Chas
Pliny the younger
“nihil novum nihil varium nihil quod non semel spectasse sufficiat”
Posts: 16,476
Threads: 573
Joined: Oct 2011
City: Jackson
State, Province, Country: NJ
>>Poking the chassis components with a tongue depressor,
Chas,
Tongue depressors only depress tongues...and their owners. 
Posts: 1,835
Threads: 117
Joined: May 2008
City: Omak
State, Province, Country: WA
hello Morzh,
Yes I had to to poke and press items on modern printed circuit boards to get sets to act up also the use of cold spray and heat .
Sincerely Richard
Posts: 713
Threads: 8
Joined: Apr 2018
City: S. Dartmouth
State, Province, Country: MA
Quote:Tongue depressors only depress tongues...and their owners.
Many, many common "tools" can be "MacGyver'd" into service to serve another purpose. I also use the T.D. whittled a bit to apply wood filler in difficult places. One end sharpened to a point it becomes a marker in the flower bed...
To suggest the use of a pencil to poke a circuit has some risk, I could suggest a Delrin or Teflon rod but not many have a such laying about. A wooden dowel, fine, even the "Popsicle" stick, after consuming the quiescently frozen confection and drying the said stick.
Chas
Pliny the younger
“nihil novum nihil varium nihil quod non semel spectasse sufficiat”
Posts: 2,135
Threads: 158
Joined: Jan 2013
City: Westland, MI
I prefer a bamboo chopstick for poking around looking for issues. Usually get them with an order to go at our local Chinese restaurant. Kills two birds with one stone! Take care and BE HEALTHY! Gary
"Don't pity the dead, pity the living, above all, those living without love."
Professor Albus Dumbledore
Gary - Westland Michigan
Posts: 16,476
Threads: 573
Joined: Oct 2011
City: Jackson
State, Province, Country: NJ
>>Kills two birds with one stone!
Exactly. First you use them to eat your Peking Duck, a bird #1.
Then you tap on the chassis of that one.
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: 1 Guest(s)
|
|
Recent Posts
|
|
Philco 610B oscillator wiring
|
| Thanks Terry. After checking my notes I think I recorded about -10v at the 6A7 G4/control grid. The screen grid (G3 &...Tubester — 05:59 PM |
|
The list of my radio & TV collection!
|
| Magical chords of forgotten melodies, old nostalgic music on an old radio... Saturday night blues on the Mid-Waves on an...RadioSvit — 12:20 PM |
|
Philco 42-345 Restoration/Repair
|
| Thank you MrFixr55 the issue with this radio is that the internal coil antenna is missing and there was a wire in its pl...osanders0311 — 11:34 AM |
|
Philco 610B oscillator wiring
|
| Regarding the oscillator circuit which is comprised of the 6A7's cathode, control grid, and screen grid. These elements ...Radioroslyn — 10:33 AM |
|
Philco 42-345 Restoration/Repair
|
| Hi OSanders,
First off, welcome to the Philco Phorum where Phine Phamily-Phriendly Pholks Phull of Philco Phacts and P...MrFixr55 — 08:41 AM |
|
Philco 42-345 Restoration/Repair
|
| Today I've been reading through the site trying to learn more about this radio. I also soldered the lose power cord cabl...osanders0311 — 08:24 PM |
|
Philco 610B oscillator wiring
|
| Thanks David! I do have that same later prodution model 610 schematic. I've also studied the Philco service bulletins fo...Tubester — 08:12 PM |
|
Philco 610B oscillator wiring
|
| Some info from Beitmans says late production. David David — 06:06 PM |
|
Restoring Philco 96
|
| Oh wow! Just found this thread. Brings me back to early days on this phorum. I did a 96 back in 2017. Thread here:
...rfeenstra — 06:05 PM |
|
Philco 610B oscillator wiring
|
| Thanks for the replies. It's not the really the hum that I am after. Just trying to understand why only the shortwave ba...Tubester — 04:01 PM |
|
Who's Online
|
There are currently 2759 online users. [Complete List]
» 2 Member(s) | 2757 Guest(s)
|
|
|
|
 
|
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
