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In Reply to: RE: A500 posted by Eli Duttman on May 14, 2015 at 07:52:16
If you change phase splitter from 6CG7 to ECC99 (12BH7) what else do you have to change (besides heater pin wires)?
Follow Ups:
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 R P , 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.
What I like about it is that it's a drop-in replacement for a 12AU7. Thus you can quickly supercharge any vintage piece that uses 12AU7 either as a CF or in a gain stage, without re-wiring the socket. Of course, the PS has to be able to make the extra filament current and the B+ current needed to make the ECC99 sound its best. I also use it in cascode as a CCS in my preamplifier, which has a -250V supply.
Edits: 05/17/15
nada aqui
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