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

Interesting problem with Philco 38-62
#1

Ever since I've owned this radio, (almost a year), it has had come-and-go problems with the RF amp circuit. It needs a really strong antenna to work passably well. What normally works on all my other radios, you have to multiply it by five for it to work on this radio. It stopped working last night, and I immediately turned my attention to the 6A8G. I put my finger on top of the grid cap and the wire that goes to the tuning condensor and it immediately starts blaring my 1410 KHz AM transmitter tunes. I pulled the schematic, and I'm going to see if changing the tube and replacing the wax capacitors in the RF amp circuit help.

Side note, this radio has the broadcast band and 2.3 to 2.5 MC band. I'd like to make use of the band switch, since 2.3 to 2.5 is dead now. I want to turn it into a tone switch, but I bet it isn't as simple as unsoldering the wires and sticking in a capacitor that goes to the audio output across the switch.  


Attached Files Image(s)
   

Slave to an RCA Victor CTC-25
#2

Have you check the antenna transformer integrity yet? #2?

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

Yup, I agree. If substituting your body for the antenna coil results in a good signal being produced from the 6A8G, then I would suggest that there is insufficient signal getting thru' the antenna transformer into the 6A8G
#4

Oh boy. That looks like a joy to troubleshoot.

Slave to an RCA Victor CTC-25
#5

This is not bad at all.

In the coil #2 measure between pins 1-2 (25 Ohm) and 3-4-5 (2.5 ohm from the center to either end). If it checks out and the soldering / wiring is good, then we move elsewhere.

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.
#6

Okay, I can probably handle that. But not until March 12th when I get to go back to the Radio Club.

Slave to an RCA Victor CTC-25
#7

You don't have a meter at home?

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.
#8

I have a Voltohmyst, but it has issues.

Slave to an RCA Victor CTC-25
#9

As long as it can reliably show short from open, it is enough.

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: 3 Guest(s)
[-]
Recent Posts
6TPZ and 5TPO Radio Help
OK, so 18 and 19 as they should be. What is "everything else?" Try to be more specific in your descriptions:...morzh — 12:44 PM
6TPZ and 5TPO Radio Help
Yeah, I'm still on 5TPO. Sorry, my bad, points 1 and 2 should be points 18 and 19 (easy mistake  :think: )  X7 is shown ...R3Sons — 11:42 AM
Philco 40-120C Filament Wiring
Hi folks, I'm in the process of restoring a Philco 40-120C and I'm finding the wiring to be a bit puzzling. According to...bluecap — 11:28 AM
462ron
Hi Levi, here’s just a thought. Most radios run the oscillator higher than the dial setting. Say you set your radio to 1...462ron — 10:10 AM
1930s Stewart-Warner Tombstone Radio need help identifying model number
Another Update: I found a couple of damaged coils inside this radio that might have something to do with why this radio ...captainclock1988 — 10:51 PM
6TPZ and 5TPO Radio Help
If you are still on 5TPO, you lost me there. What X7? What Points 1 and 2?morzh — 08:37 PM
6TPZ and 5TPO Radio Help
Quick progress report: X7 is broken. Only one leg soldered, the other missing and the diode is cracked. I've replaced...R3Sons — 05:05 PM
6TPZ and 5TPO Radio Help
Oh...and you have electrolytic caps there. All need to go and be replaced.morzh — 04:36 PM
6TPZ and 5TPO Radio Help
Thanks, will do.R3Sons — 01:25 PM
1930s Stewart-Warner Tombstone Radio need help identifying model number
UPDATE: I was able to pick up a signal generator on the cheap (amazingly enough) on feebay and I did an IF alignment fol...captainclock1988 — 09:53 AM

[-]
Who's Online
There are currently 5596 online users. [Complete List]
» 1 Member(s) | 5595 Guest(s)
Avatar

>