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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: Adventures in American tube land posted by MLGrado on March 23, 2015 at 10:03:45:
Is the 5963 truly compatible with a slot designed for a 12AU7? Both from i) a heater-current limits / safety viewpoint and ii) a circuit performance view point.
If your power amp is out of warranty (and isn't a stage / music / PA amp), have you considered ditching the 12AU7s and rejigging the circuit for a much lower distortion noval twin-triode?
The 12AU7 family has quite high distortion and IMO only work acceptably well as cathode-followers.
If your amp has the heater current reserves to cope, a 6C/FQ7 would be far better than a 13D5 as would a 'super 6DJ8' even a 6H30.
The phase-splitter role is important IMO&E and if it's a twin-triode slot a single CCS per tube in LTPair mode is likely to improve the sound - and splitter balance - significantly.
More? As the circuit's inherent distortion will also be a lot lower you can use much less NFB around the splitter / overall loop NFB. Gaining gain some additional stability in overload. None of which can be bad things.
In my case I replaced a 12AX7 in LTP with a FET CCS'd 6CG7 in LTP and was able to lower total NFB.
Warmest
Tim Bailey
Skeptical Measurer & Audio Scrounger
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Follow Ups
- a couple or three thoughts - Timbo in Oz 21:45:20 03/23/15 (1)
- RE: a couple or three thoughts - Eli Duttman 08:16:09 03/25/15 (0)
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