Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5

Tuning Eye Help
#16

That's the AGC action. Without an antenna, the AGC isn't in play, since all stations are weak. The radio runs in its 'full open' mode, to allow in the most signal. So, you don't see much, if any, action from the eye tube. Once you connect an antenna, the AGC starts working because of the stronger signal input. As it 'turns on', the AGC goes more negative and applies a DC voltage to the grids of one or more tubes, making them less sensitive to incoming signals. This negative DC voltage then causes your eye tube to begin to close.
#17

Thanks Brenda!.. It's always good to learn new things about radios. I ended up disconnecting R22 and now the eye tube works exactly as needed. The set is almost finished now and I am very happy with it.

The artist formerly known as Puhpow! 8)
#18

I have had the same type of problems with the tuning eye on
various radios and if is a bright green and does not move , I wait until I align the radio and then if it still does not close properly, I start with the troubleshooting.
Glad you got it going..
#19

Another thing to remember is the lower case "m" was also used to designate kilohms, just like the lower case "w" was used to designate Ohms.

That has fouled up many a schematic reader...

73DG

Pacing the cage...
#20

Thanks for that info. It doesn't take much to foul me up..

The artist formerly known as Puhpow! 8)
#21

One more possibility... Unless it's too late. Inside the tube socket cover there is usually a resistor. They OPEN UP, and the tuning eye just sits there. I don't remember the pin numbers, but it's there. It cost less than running another wire up from the chassis. I seem to remeber that the resistor sent amplified AGC voltage to the deflection plate in the tube.




Users browsing this thread: 2 Guest(s)
[-]
Recent Posts
trying to identify this wire type
...and modern wire of the appropriate gauges and insulation V-rating (300V minimum, usually shown right on the wire) is ...morzh — 05:47 PM
1930s Stromberg-Carlson Tombstone Radio need help identifying model number
I have a question about this radio, is there anyone that has access to this radio that has an intact unmolested speaker ...captainclock1988 — 04:28 PM
1930s Stromberg-Carlson Tombstone Radio need help identifying model number
Well what makes me confuse all of those companies is that all three of those companies (Setchell-Carlson, Stromberg-Carl...captainclock1988 — 04:21 PM
trying to identify this wire type
The red wire is rubber covered wire. The others are cotton braid over rubber often in colors or a tracer, also strand...Chas — 02:43 PM
trying to identify this wire type
Greetings Phorum members, Hope you can help me identify this type of wire in the photo I have attached.  I am not sure ...georgetownjohn — 01:53 PM
Philco 60 Squealing
All correct shields must be in place, all tubes correct no subs of any kind. Check any soldered, riveted ground conne...Chas — 01:24 PM
Philco 60 Squealing
I have recapped and replaced out of tolerance resistors and so on. Radio plays nicely on fairly strong stations. The pro...dconant — 10:55 AM
Philco 46-420 Code 121 Reception issues
Welcome Eric, I agree with Bob and far as the two main electrolytic filter capacitors did you change them yourself or w...radiorich — 11:43 PM
Philco 46-420 Code 121 Reception issues
You mentioned the Philco manual and going through the check points...just to be sure we're on the same page here's the m...klondike98 — 08:13 PM
Philco 42-1008 conversion kit
Interesting. I haven't seen that before.klondike98 — 07:02 PM

[-]
Who's Online
There are currently 4114 online users. [Complete List]
» 3 Member(s) | 4111 Guest(s)
AvatarAvatarAvatar

>