Bottlehead Forum

RE: anybody tried the JJ ECC99 in place of 12AU7?

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In Reply to: RE: anybody tried the JJ ECC99 in place of 12AU7? posted by chacodude on December 07, 2007 at 17:38:04

The FP-III can power a pair of them, but not a third one - so the hybrid shunt regulator upgrade is not practical, but otherwise (stock gas tube regulator, with or without C4S's) it is do-able. I would expect a pretty beefy sound, in fact.

The C4S currents will have to increase and/or the loading resistors decrease, and the resistor in the heater supply must be lower resistance; all these resistors will have to handle more power as well. The shunt reg tube will need much more current, so it's C4S or resistor will get pretty hot - heat sinks needed! That's pretty much all the changes necessary.

I'll work up the exact currents etc. if anyone actually is going to try this.

Follow Ups:

Hmm - Caucasian Blackplate 00:34:57 12/08/07 (0)
RE: anybody tried the JJ ECC99 in place of 12AU7? - chacodude 20:44:22 12/07/07 (0)

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