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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: Quick Tube Question posted by Doc Sarvis on March 25, 2006 at 08:39:28:
A 12AX7A is a 12AX7 with a controlled heater warm-up.Only the American companies made the "A" version; they're the same--on paper. The first description of the 'A stated that it was audio-oriented due to its controlled hum and microphonic characteristics. The original 12AX7, introduced in 1947, was considered an all purpose dual triode to be used in AF amplification. Hi-Fi manufacturers adopted it as their quintessential voltage amp tube in the '50s, RCA changed the heater design to lower the hum and noise and marketed it as the audio 12AX7 in 1960. When they discontinued the 12AX7 a few years later, the 'A was referred to as strictly an audio tube.
Regards,
"Kico"||||||||||/
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Follow Ups
- Re: Quick Tube Question - Kico 10:20:15 03/25/06 (1)
- Thanks! - Doc Sarvis 06:31:11 03/26/06 (0)
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