RE: gm of DHTs

Posted by PakProtector (A) on September 16, 2009 at 03:32:57

In Reply to: gm of DHTs posted by andy evans on September 15, 2009 at 18:02:15:

hey-Hey!!!,
Type HY51B has gm of 6.5 mA/V...and a plate resistance of ~4k once current is flowing. That sort of characteristic makes it a bit of a challenge. I'd consider type 2A3 if I wanted to build a DH triode cascode. The IDH valves are indeed easier to use, with gm in the 8-20 mA/V range and plate Z low enough to allow low Ec2 voltages( the upper grid/gate voltage ).
cheers,
Douglas

Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.

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Follow Ups Full Thread

Topic - differential phase splitter for the PP power ampilifier - RCA805 21:50:59 09/14/09 (16)

RE: differential phase splitter for the PP power ampilifier - Ray Moth 18:18:35 09/15/09 (0)

RE: differential phase splitter for the PP power ampilifier - Allen Wright 02:04:45 09/15/09 (14)

RE: differential phase splitter for the PP power ampilifier - RCA805 22:11:55 09/15/09 (3)

RE: differential phase splitter for the PP power ampilifier - Allen Wright 05:25:46 09/16/09 (2)

RE: differential phase splitter for the PP power ampilifier - RCA805 06:16:39 09/17/09 (1)

It's called a CASCODE circuit. - Allen Wright 08:48:35 09/17/09 (0)

PP-1C - LowRedMoon 17:40:03 09/15/09 (1)

RE: PP-1C - Allen Wright 04:51:39 09/17/09 (0)

Allen - would your cascode work with DHTs? - andy evans 04:58:46 09/15/09 (7)

RE: Allen - would your cascode work with DHTs? - PakProtector 05:41:02 09/15/09 (0)

RE: Allen - would your cascode work with DHTs? - Allen Wright 05:35:20 09/15/09 (5)

I'll take that as a no! - andy evans 06:37:14 09/15/09 (4)

NEVER! - Allen Wright 07:41:36 09/15/09 (0)

RE: I'll take that as a no! - PakProtector 07:20:16 09/15/09 (2)

gm of DHTs - andy evans 18:02:15 09/15/09 (1)

RE: gm of DHTs - PakProtector 09/16/0903:32:57 09/16/09 (0)

Follow Ups

RE: gm of DHTs - PakProtector 09/16/0903:32:57 09/16/09 (0)

RE: gm of DHTs

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