Philco model 70 rebuild - by Tim P.
Posts: 1,192
Threads: 83
Joined: Jan 2014
City: Annapolis, IL
State, Province, Country: USA
I have tested this on and off as much as I could this week. I reconnected the original bias resistor last night, but I didnt notice any major difference, although I thought I heard 'the sound'. This evening, I powered up and immediatly heard the noises & saw erratic current fluctuations. I powered down and temp installed a 68ohm resistor. So far so good. With it being intermittent, it is really hard to tell quickly of the problem is really solved or if it is just 'deciding' to work for the time.
When I checked the F-G, I had one of the wires disconnected. I think the problem is in that bias resistor. I dont know if I should replace only the bad section or if I should replace it all. Tell ya, if this is the problem, this one should go in the record books!
If I could find the place called "Somewhere", I could find "Anything" 
Tim
Jesus cried out and said, "Whoever believes in me , believes not in me but in him who sent me" John 12:44
Messages In This Thread
RE: Philco model 70 rebuild - by Tim P. - by TV MAN - 05-09-2014, 08:48 PM
Users browsing this thread: 20 Guest(s)
|
|
Recent Posts
|
|
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 |
|
RCA 15X
|
| Everthing goes at once, maybe it's the cold weather, I have had 2 dial strings break and no my little RCA is having dial...Paul Philco322 — 10:26 PM |
|
Philco 91 Schematic
|
| Hi Dan,
I can't explain this specific resistor but I have seen the use of a switch to apply B+ voltage to screen gri...RodB — 09:36 PM |
|
Who's Online
|
| There are currently no members online. |
|
 
|
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
