Posted by PakProtector [ 205.188.116.67 ] on December 18, 2005 at 07:36:55:
Hey-Hey!!!,
Since all the E-Linear S265Q should be delivered by Monday, there are a few options on the complex looking front end.
First is to wait while a PCB is developed for the V2. This is what I am currently listening to, but it looks intimidating on paper...:)
Second is a pair of pentodes. EF184, 6AC7(mmmmhhhhh...octal!), 6AU6 or 12BY7 come to mind. This option leaves a single CCS for the cathodes, and g2 done with dropping R and cathode coupling cap. Frobably a few uF required.
Third would be to use a voltage divider for the upper gate. Keep the gate cathode node coupled with a cap, similar to the pentode mode. Haven't tried this one, since the MOSFET's no longer look so complicated. Just size the voltage divider to run a mA or so, and keep the low-pass R-C at something below 15 cps.
I am putting a few of these to paper and pdf, so look at projects on Monday. Probably going to include a few on cascode plate curves...:)
cheers,
Douglas
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