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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: RE: A500 - changing phase splitter tube posted by PeterI on May 14, 2015 at 08:03:43:
The triodes in the 6CG7 and 12BH7 are so close electrically that, most of the time, rewiring the heater connections is all you have to do.
The ECC99 is a different story. That type exhibits very high gm, very low RP, and a big heater draw. Given those facts, the ECC99 falls into a so called "super triode" group, along with the 5687 and the Russian 6n30p. What I find attractive about the ECC99, for service as the LTP in a Mullard circuit, is: its mu of 22, the highest B+ limit among "super triodes", and the smallest heater draw of the threesome.
Eli D.
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Follow Ups
- RE: A500 - changing phase splitter tube - Eli Duttman 09:48:04 05/14/15 (2)
- Ditto on ECC99 - Lew 11:27:26 05/17/15 (0)
- Don't forget the 7044 :) nt - Triode_Kingdom 11:33:56 05/14/15 (0)
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