Does anyone know this novar tube ? similar to 6av5 ? , look a little like a sweep tube but cant find much in detail about it …..perhaps a Euro getter ?
pin 1 ,G1
pin 2 , unused / no connection
pin 3 ,G2
pin 4 & 5 heaters
pin 6 , plate / anode
pin 7 , cathode & G3
pin 8 , G1
pin 9 , unused / no connection
Thankyou , good folk of Diyaudio !!!!!🙂
pin 1 ,G1
pin 2 , unused / no connection
pin 3 ,G2
pin 4 & 5 heaters
pin 6 , plate / anode
pin 7 , cathode & G3
pin 8 , G1
pin 9 , unused / no connection
Thankyou , good folk of Diyaudio !!!!!🙂
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I doubt that it is a TV sweep tube. A horizontal sweep tube has peak voltages in the several KV range on it's plate. The plate is usually routed to a top cap to handle the voltage. If it is routed to a pin on the base, the adjacent pins are usually left unconnected, and labeled IC or do not use. The plate would not be between the heater and cathode.
It looks like a 7868, but your pinout does not match.
Measure the diameter of the base pins. US made or designed Novars have .040 inch pins, while Japanese or European Made Magnovals have .050 inch pins.
Tubes made in Soviet or ex Soviet countries often have pointed pins, while US and many Japanese made tubes are nearly always rounded.
The heater has some heavy insulation, possibly implying direct from line operation. Do you have any information on what it was used in? Does the heater light up properly on 6.3 volts?
It looks like a 7868, but your pinout does not match.
Measure the diameter of the base pins. US made or designed Novars have .040 inch pins, while Japanese or European Made Magnovals have .050 inch pins.
Tubes made in Soviet or ex Soviet countries often have pointed pins, while US and many Japanese made tubes are nearly always rounded.
The heater has some heavy insulation, possibly implying direct from line operation. Do you have any information on what it was used in? Does the heater light up properly on 6.3 volts?
Definitively looks like a EL508 (6,3V heater) or PL508 (17V 0,3A serial heater).
Used in CTV for vertical deflection.
Mona
Used in CTV for vertical deflection.
Mona
I had to look that one up since there in no US equivalent that I know of. I agree. The vertical deflection tube in a TV set is a class A linear amplifier, tuned for 50 or 60 Hz.
I exploited this fact as a youngster when I would lift the entire vertical sweep section from a TV set, remove the feedback capacitor, and insert a guitar jack, to make amps. Even the vertical output transformer will drive a speaker quite nicely, if it was the 4 wire version. The 3 wire transformers are autotransformers which will put B+ on the speaker wires. Not a problem with the deflection yoke inside a TV, but can make for a shocking experience in a guitar amp.