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1 ANTIQUE RCA VACUUM ELECTRON VIDEO TUBE 6AF11 VINTAGE
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Time left: |
(10/18/2008 10:20:12 PM) |
Seller: |
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connielita |
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Current Bid: |
USD 0.7 |
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HERE IS ONE RCA RADIOTRON ELECTRON TUBE TYPE 6AF11
IN IT'S OWN ORIGINAL BOX
APPEARS TO BE NEW AND NEVER USED!!
HAS A TOP HALO GETTER WITH GRAY PLATESNUMBER: 6AF11
CONSTRUCTION: 12-PIN COMPACTRON T-9
BASING: 12DP
H/F VOLTAGE: 6.3V
H/F CURRENT: 1.05A
DESCRIPTION: HIGH-mu TRIODE, MEDIUM-Mu TRIODE, SHARP CUTOFF PENTODE
USE: AGC KEYER, SYNC SEPARATOR, VIDEO AMPLIFIER
6AF11, a three-tube portmanteau consisting of a high-mu triode for AGC keyer service, a medium-mu triode for sync separator service, and a sharp-cutoff pentode for video amplifier service. The 6T9 is a hi-mu triode and power pentode combo representing the entire audio section of a simple TV set. (There was no stereo sound in TV technology at that time.) These sound very application-specific, but they're still just tubes, and they can be used for lots more than the TV circuits that they were designed for. The 6T9, for example, can work at RF frequencies up to 30 MHz, and there are a number of circuits using it for simple amateur radio CW transmitters, with the triode acting as a crystal oscillator and the power pentode as a 5W RF power amplifier. The 6AF11 is used in a popular regenerative all-band receiver circuit designed at GE and published in Popular Electronics in 1963.
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