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

35WG-1570B
#1

Hi Guys,


I have an interesting problem this time. I Did a full recap on this AM/FM radio, along with a complete tube and resistor check. I got it all together and had it up in the kitchen where I've been listening to it for a couple weeks. I was listening to it the other day when all of a sudden the volume dropped and I had no sound on either band. Well, back to the bench. I plugged my iphone and was able to hear it just fine. Put the band switch back to AM or FM and nothing.
The weird thing is that one resistor-R16 a 1K, was starting to smoke. I swapped out the 6X5 but it didn't help. I retested all connections and they all look good. Any ideas? (35WG and 25WG)


Attached Files
.pdf usa_montgomery_airline_25wg_1570b_sch1.pdf Size: 337.58 KB  Downloads: 146

Eric
The Villages, FL
Member: Philco Phorum, ARF, ARCI & Radiomuseum.org

#2

Either the tube 68A6 or C19 cap, 5000mmf connected to that resistor, SG of the tube and output xfmr

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.
#3

(12-09-2016, 04:22 PM)Eric Adams Wrote:  Hi Guys,


I have an interesting problem this time. I Did a full recap on this AM/FM radio, along with a complete tube and resistor check. I got it all together and had it up in the kitchen where I've been listening to it for a couple weeks. I was listening to it the other day when all of a sudden the volume dropped and I had no sound on either band. Well, back to the bench. I plugged my iphone and was able to hear it just fine. Put the band switch back to AM or FM and nothing.
The weird thing is that one resistor-R16 a 1K, was starting to smoke. I swapped out the 6X5 but it didn't help. I retested all connections and they all look good. Any ideas? (35WG and 25WG)

Check for shorts to the chassis around L-13 and bad C-19.

GL

When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got!

Terry
#4

OK, here's what I did. I tested the cap, IF trans and resistor. They all tested good, each one was removed from the circuit for testing. So I put it all together and with all tubes out except the 6X5 (the way I ran all tests). I ran up the voltage slowly, watching the resistor in question for any smoke. Got it up to about 110v with no smoke or heat. After about a minute of this there was a spark under the area of the tuning cap. No smoke or flame (Wow, I sound like kirk). I figured I can't hurt it anymore so I killed the power and installed the tubes. I ran the power up and after a few minutes the radio was working fine. No, I haven't checked where the spark came from, but I will. Thanks to everyone for your help.

Eric
The Villages, FL
Member: Philco Phorum, ARF, ARCI & Radiomuseum.org





Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
What do I have? Philco 655
hello Adam, What a great looking radio and I agree with mr Fixr and Gary if Ron was still with us I am sure he would re...radiorich — 10:23 PM
What do I have? Philco 655
Wouldn't be the first "Phranken-Philco" to come out of the factory. Kinda like model year end cars built back...GarySP — 07:45 PM
Philco Model 76 Highboy
That's a nice looking cabinet. With a little bit of rub on stain and paste wax that should even out the finish. When you...Radioroslyn — 05:20 PM
What do I have? Philco 655
Hi Adam, Others may know more than me, but it was not uncommon for Philco to run out of cabinets and use one for a new...MrFixr55 — 02:51 PM
What do I have? Philco 655
Haven't been on here in a while, and it's been a while since I've worked on a Philco.  I picked this up a while back, an...adamrobertg — 08:10 AM
Clear Schematic for 41-255
Hello Ross, We have all been there don't worry the guys here have you taken care of !! Sincerely Richardradiorich — 09:35 PM
Clear Schematic for 41-255
What's really funny is I looked at the pages and saw 255 and it took me 30 sec of looking at the schematic trying to fig...RossH — 05:19 PM
Clear Schematic for 41-255
Ross, sorry, clicked on the wrong one. here's the down load for the 41-255 as an attachment.klondike98 — 04:40 PM
Clear Schematic for 41-255
RossH - Were you looking at our copy of the 1941 Yearbook, or one that you found elsewhere?DaleHCook — 04:12 PM
Clear Schematic for 41-255
Ditto. Perfectly readable here. Monitor or computer problems?!rfeenstra — 12:10 PM

[-]
Who's Online
There are currently no members online.

>