120.155.151.166
This Post Has Been Edited by the Author
In Reply to: RE: Driver tube suggetions for 300B amp posted by dave slagle on February 11, 2016 at 14:05:52
The 4V filament TJ PX25 was closer to the traditional PX25A or some such. The 5V filament TJ PX25 was a little different and its curves/ ideal operating points did not resemble any particular tube. Still, it was used in the DIY HiFi LadyDay amps with only minor mods (cathode R change to lower plate current) and 5K load. IIRC, apparently it sounded similar to the TJ 300B run at cool operating points and 5K load.
All this was going on about 10 years ago on the DIY HiFi forum, back when Brian Cherry owned it and Thorsten was in the mix. Could probably be interweb searched.
Cheers,
91
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