Project impossible? bringing a magnet-box back from the dead?

[Yamamaya42]

Originally Posted by dieseljeep

I have a Magnavox combo that has a rebuilt 24AHP4, which seems to be perfect! I took it for the PPP 6V6 mono amp. If I could give the set away to a collector, I'd leave it intact.

If you were not so far away from me T_T

because shipping is murder!


But now I have another problem to work out, I did not notice that the video going into the output tube is inverted , YES it's 1.5 ptp, but it is upside down, and gets fed into the CRT cathode at 50v
so now I gotta work out how to invert a composite video input. Because I don't think this will work to well off IF with my tuner subber as a source.

I am thinking of this a a AMP. But I do not know op-amps very well.
https://www.eleccircuit.com/simple-v...ifier-circuit/

they do not make DIP LM359 chips anymore and I don't trust the ones from china, FAKE! So all I can find are surface mount.

But I can assume, if I swap the + & - inputs, I will get inverted ( negative ) output ? And adjust R1 /R3 till I get close to 1 to 1 or slightly higher gain from it? Am I guessing right?

[Electronic M]

Originally Posted by Yamamaya42

If you were not so far away from me T_T

because shipping is murder!


But now I have another problem to work out, I did not notice that the video going into the output tube is inverted , YES it's 1.5 ptp, but it is upside down, and gets fed into the CRT cathode at 50v
so now I gotta work out how to invert a composite video input. Because I don't think this will work to well off IF with my tuner subber as a source.

I am thinking of this a a AMP. But I do not know op-amps very well.
https://www.eleccircuit.com/simple-v...ifier-circuit/

they do not make DIP LM359 chips anymore and I don't trust the ones from china, FAKE! So all I can find are surface mount.

But I can assume, if I swap the + & - inputs, I will get inverted ( negative ) output ? And adjust R1 /R3 till I get close to 1 to 1 or slightly higher gain from it? Am I guessing right?

Google inverting op amp circuit (or read the Wikipedia page on op amps) and that will give you the schematic and maths to make a circuit.

Personally I'd try getting a tuner for it. That almost certainly uses the modern IF frequency and generally they aligned TV tuners and IFs to be interchangeable... as long as you don't try something silly like making a late 40s 21MHz tuner work with a 60's 44MHz IF TV.

[Yamamaya42]

Originally Posted by Electronic M

Google inverting op amp circuit (or read the Wikipedia page on op amps) and that will give you the schematic and maths to make a circuit.

Personally I'd try getting a tuner for it. That almost certainly uses the modern IF frequency and generally they aligned TV tuners and IFs to be interchangeable... as long as you don't try something silly like making a late 40s 21MHz tuner work with a 60's 44MHz IF TV.

I have found stuff like this ,, no idea if it would work or not
https://www.ebay.com/itm/18459874966...wAAOSwzEpf6Su2