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845's were intended for radio transmitters..etc...
Follow Ups:
7199 - triode/pentode, voltage amp/splitter
6BR7 - AF voltage amplifier pentode
12AD7, 12DF7, 12DM7 - 12AX7 analogs for HiFi
12AY7 - 12AU7 analog for HiFiMany pentodes were specially designed to amplify audio frequencies:
6Y6, 6V6, EL84/6BQ5, 6CZ5, EL34/7027/6CA7, EL37, KT tubes, 5881, 7581, 6550, 6973, 7868, E84L/7320, etc.
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nt
all the best,
mrh
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When I acquired an EICO AF-4 from a relative :-) Dust and all...
An audio modulator is an audio power amplifier. The 211, the 2A3, 300B, 807, 1625 were all used as audio modulators in radio transmitters before they were used in audio-hifi. But probably the most ubiquitous would be the 6SN7 family; the 6C5 6J5, 12J5, 7N7.
"I take you as you are
And make of you what I will,
Skunk-bear, carcajou, bloodthirsty
Non-survivor.
Lord, let me die but not die out." THE LAST WOLVERINE by James Dickey
as vertical deflection amplifiers, IIRC. That's why there are so many of them around.
the record head was driven by a 6SN7. And every play head on playback was processed through a line amp with two 6SN7s. That's virtually every thing recorded in the fifties by the major recording companies. Ray Hughes
"I take you as you are
And make of you what I will,
Skunk-bear, carcajou, bloodthirsty
Non-survivor.
Lord, let me die but not die out." THE LAST WOLVERINE by James Dickey
Having owned several 300 series Ampex's in the past, yes, you are correct ... there are plenty of 6SN7's inside.But, the 6SN7 originated in 1939 as a Television vertical-deflection amplifier, which was 10 years before the Ampex 300 was introduced.
It just so happens to work well in audio circuits, too.
That's true for the GTA and GTB variants. However the 'SN7 itself predates TV. The military used their share during WW2.
Eli D.
Iczerman, hi. Actually, the 845 was intended for audio. It was used in top of the Deluxe line motion picture sound theater gear as built by RCA in 1939 and had been used in that capacity for a number of years. The 845 was designed for Class A operation audio frequency service. The 12AY7 is another tube that was created with Class A audio service in mind - specifically low microphics.
26, 27 , 37, 42 , 45, 56, 76 , 46, 47, 6F6, 6J7 /1603 /1620 , 6L6 (not 807!) and some few more .
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