Estate Sale Finds In 2008!

[Gianni]

Originally Posted by Chad Hauris

I have a GE set which uses a 5-tube chassis...can't remember what the tube numbers are, but the functions are:
1. Horiz output & damper
2. Vertical output, oscillator, and feedback diode
3. Video output and AGC keying
4. 1st and 2nd IF
5. Sound detector and output
This set does not have a seperate horizontal oscillator tube or transistor that I can see...somehow it uses feedback off the flyback to make the oscillator work.

I think in the set in question here it uses a transistor for the horiz osc and it probably has the IC sound discriminator and transistor audio output.

...What about:
- tuner,
- synchronisme separator ( only a diode? )
- sound intermediate frequency,
- extra hight voltage rectifier ( a valve? )

I have the schematic diagram of a 12 tubes Irradio set from the 50s who has a PL81 pentode as an auto-oscillator horizontal final stage.