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 80 jr. help please. 1st time restoring a radio this old
#44

the radio is working, it just has an AC hum in the audio.

when the 2nd detector tube is removed the hum is gone.

when the det-osc tube is removed, the hum is still there.

i tried switching the type 36 tubes and it made no difference.

when i touch the wire going to the control grid (top) of the 2nd detector tube, the hum gets quite a bit louder.

this leads me to believe that the problem is in the 2nd detector section.

if someone could either confirm or refute my suspicion, it would be very helpful.

logic tells me that the problem is in the rectifier/ power supply section, but i dont have the experience with these sets to be sure.

i really appreciate all the help so far.
without you guys i would be lost.
LC


Messages In This Thread
RE: philco 80 jr. help please. 1st time restoring a radio this old - by loosecannon - 09-07-2014, 08:15 PM



Users browsing this thread: 9 Guest(s)
[-]
Recent Posts
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
Philco 91 Schematic
Hi Rod, The resistor connects to pin 4 and the ungrounded side of block 9. From pin 9 of the RF tube to one side of ...dconant — 09:34 AM
Just got a 49-1613 need to know...everything!
I just found your post. I have this exact same model, and have had it since 1985 when I was 15 years old! I performed a ...MuzzcoVW — 09:11 AM
B&K 1077B no video
Hello Tim, I would if it's a leaky Capacitor So are all 3 of those B- voltages low then ? Sincerely Richardradiorich — 01:55 AM
B&K 1077B no video
I found a schematic and think I have the problem traced down to the minus power supply. I have very low voltages that go...TV MAN — 12:41 AM
RCA 15X
I'd try replacing the bulb first and if that doesn't do it, then change the 35Z5 and see if the problem goes away.NostalgiaRadioTime — 12:28 AM
B&K 1077B no video
Hello Tim, I have that exact unit in my shop too plus a Sencore unit there are times I like one or other !!. Sincerely...radiorich — 11:07 PM

[-]
Who's Online
There are currently 9079 online users. [Complete List]
» 3 Member(s) | 9076 Guest(s)
AvatarAvatarAvatar

>