1. The PHILCO Phorum
  2. Philco Radio Discussions
  3. Philco Home Radios

Welcome Guest! Be sure you know and follow the Phorum Rules before posting. Thank you and Enjoy! (January 12, 2025) x

Thread Closed

Linear Mode
A question about my model 70.
Steve Davis
Phorum Expert
*****
Posts: 1,419
Threads: 71
Joined: Oct 2007
City: Linn Creek, MO
#2

05-20-2012, 11:07 AM
Music, If you have a 60 cycle (probably 120 cycle) hum, there would have to be at least two tubes lighting, the rectifier (80) and the output (47). If most of the tubes don't light, my guess is, someone removed the good tubes and replaced them with duds. Though it is possible that there is a break in the heater circuit.

Steve
M R Radios   C M Tubes
Find
« Next Oldest | Next Newest »
Thread Closed


Messages In This Thread
RE: A question about my model 70. - by Steve Davis - 05-20-2012, 11:07 AM
RE: A question about my model 70. - by TA Forbes - 05-20-2012, 12:13 PM
RE: A question about my model 70. - by TA Forbes - 05-20-2012, 11:31 PM



Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
54C Complete Teardown/Rebuild
Hello Roy, here is this one sincerely Richardradiorich — 12:45 AM
54C Complete Teardown/Rebuild
Richard, Had grabbed it already but thank you just the same.  I find myself wanting to find some way to block out the...glyphmon — 12:03 AM
54C Complete Teardown/Rebuild
Hello roy, here is a link to the schematic . Sincerely Richardradiorich — 11:54 PM
54C Complete Teardown/Rebuild
Richard, The Silvertone 2014 also is a transformerless set, so I am incorporating a 1:1 600 ohm audio isolation transfo...glyphmon — 11:37 PM
Preliminary work on wife's Silvertone 2014
Did an alignment today which was interesting.  IF alignment went great, almost all was already spot-on.  Adjusting on th...glyphmon — 11:35 PM
54C Complete Teardown/Rebuild
The main problem with adding a Bluetooth input is that this set lacks a traditional power transformer to isolate it from...radiorich — 11:19 PM
54C Cabinet Refinish
I started stripping this cabinet before it got super chilly out because I knew I wasn't going to be able to work on ...glyphmon — 11:18 PM
54C Complete Teardown/Rebuild
While I'm waiting to wrap up the final steps on my wife's Silvertone 2014, I started disassembly on the next project.  O...glyphmon — 11:07 PM
Preliminary work on wife's Silvertone 2014
Hello roy, that great news glad it worked out for you !! Sincerely Richardradiorich — 10:50 PM
Preliminary work on wife's Silvertone 2014
Safety caps arrived today.  Soldered one in and had a successful first power-up.  No magic smoke escaped and it tunes in...glyphmon — 09:53 PM

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

>
  1. The PHILCO Phorum
  2. Philco Radio Discussions
  3. Philco Home Radios