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

Dragging out an old nemisis-Philco 66 cathedral-SUCCESS
#24

Point taken from both of you. I've had the fates conspire to keep me out of the workroom for a couple of days, but I got in for 30 minutes today. Before I take off the training wheels and get rid of the apparatus, I wanted to double check my reading of the schematic. I went tube-by-tube looking from radio to schematic-to tube manual looking for errors in wiring because the thing that kept me using the dim bulb was a glow coming from the bulb about 60 seconds after startup. I am still concerned that my grounding is done correctly, but I did find a rather embarrassing mistake at C40. I had transposed the connections for the 75 grid cap and C42 & R43. I had them backwards. I fixed it, and I desoldered a few sketchy solders I had done, started it up and had a momentary squeal, then nothing. I turned the volume switch and get a bit of static as it moves, but nothing from the tuning cap turning. Touching the soldering iron to the caps of the 75 and the 6A7 give a respectable buzz, on the 78, a softer one. Touching the volume switch gets a loud buzz, too. I don't have time for voltages today (without the 40 watt bulb stealing voltage), but I should have a new set of numbers by tomorrow. Am I right in thinking that my output stage issues might be almost over here and I can start working on getting the 6A7 to oscillate? Voltages first, though. Thanks for the help. And the patience.


Messages In This Thread
RE: Dragging out an old nemisis-Philco 66 cathedral - by ccomer1955 - 08-17-2014, 04:01 PM



Users browsing this thread: 8 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 9953 online users. [Complete List]
» 1 Member(s) | 9952 Guest(s)
Avatar

>