1. The PHILCO Phorum
  2. Philco Radio Discussions
  3. Philco Electronic Restoration

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

Linear Mode
116b shadowmeter
etech
Member
***
Posts: 237
Threads: 24
Joined: Dec 2007
City: Gladwin, MI
#4

11-23-2008, 01:58 PM
Quote:Across the meter is voltage swings from 0.78, volts dc tuned to .221 vdc untuned.

Robert, it would seem to me that the voltage across the shadow meter with no signal should be more in the order of 7.8vdc, not .78vdc. Are you sure you are reading this correctly? If so, double check resistor 75 (2000 ohm) to see if it is the correct value. You will probably have to lift one of the wires from the shadowmeter to make this measurement. Also, double check the cathode resistors of the RF tube and the 1st IF tube. They should each be 300 ohms. If they are within 20%, they should be OK.

Ed
Find
« Next Oldest | Next Newest »
Thread Closed


Messages In This Thread
116b shadowmeter - by Robert - 11-23-2008, 12:24 PM
Re: 116b shadowmeter - by etech - 11-23-2008, 01:21 PM
Re: 116b shadowmeter - by Robert - 11-23-2008, 01:40 PM
Re: 116b shadowmeter - by etech - 11-23-2008, 01:58 PM
Re: 116b shadowmeter - by Robert - 11-23-2008, 02:56 PM
Re: 116b shadowmeter - by etech - 11-23-2008, 03:22 PM



Users browsing this thread: 2 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 11427 online users. [Complete List]
» 2 Member(s) | 11425 Guest(s)
AvatarAvatar

>
  1. The PHILCO Phorum
  2. Philco Radio Discussions
  3. Philco Electronic Restoration