> GE 5 star tubes are supposed to be good for 10,000 hours, no?
The tubes he cites appear to be in the ECC199 family. The '199 data gives >5,000 hours AT conditions similar to his (12-15mA).
So something isn't right.
> Sky King, Twighlight Zone, then the test pattern...
OTOH, we observed anecdotally that if you left the TV on after the transmitter was shut-down, regularly, the Tuner tube would fade or crap-out. The theory was that it was idle-biased at 10-20mA for lowest snow on weak stations, but the makers knew people didn't watch weak stations much. When a usable signal was received, the AGC would throw the tuner current down to 5mA, 2mA, whatever was needed. And that non-pro TV sets were value-engineered with this pattern in mind.
You forgot the Sermonette.
The tubes he cites appear to be in the ECC199 family. The '199 data gives >5,000 hours AT conditions similar to his (12-15mA).
So something isn't right.
> Sky King, Twighlight Zone, then the test pattern...
OTOH, we observed anecdotally that if you left the TV on after the transmitter was shut-down, regularly, the Tuner tube would fade or crap-out. The theory was that it was idle-biased at 10-20mA for lowest snow on weak stations, but the makers knew people didn't watch weak stations much. When a usable signal was received, the AGC would throw the tuner current down to 5mA, 2mA, whatever was needed. And that non-pro TV sets were value-engineered with this pattern in mind.
You forgot the Sermonette.