[Amps] GS-35B optimum B+ for efficiency/power out

[Ryan Foster]

I don't have the proper equipment to know the db rating, but at 4220v
(no load) I have just a touch more than the 3-500 based amp (say +3db
over 3-500's (both driven to 1500) (sry, forget the voltage on the
3-500 plate) (What does that make that about as good as normally
driven 572b's?), BUT it has air flow like no other.  My lack of
knowledge of thermodynamics leads me to completely over-do it all the
time, and that lack of knowledge and subsequent over engineering leads
to me using the 3-500 based amps (both made and drake) more than
anything because they are almost silent and I can forget they are on.

I have seen guys projects at 5kv, but I have yet to see a imd spec on that.


On Tue, Apr 27, 2010 at 5:43 PM, Dave White <mausoptik at btinternet.com> wrote:
> Personally I'd say that 4kv is a little on the high side for a gs35 but I've seen plenty of circuits that use that kind of HT with that tube.
>
> Sufficient cooling is the key to success.  Look through the recent archives regarding water cooling with a GS35b.
>
> I don't know much about IMD for this tube at high voltages.  Some contesters would argue that being a little wide is like making some space with your elbows on a crowded Underground train (those who travel in the London rush hour will appreciate the analogy).  Others may regard such things as unethical.  Cue discussion... :-)
> Dave G0OIL
>
> -----Original Message-----
> From: "Patrick Barthelow" <apolloeme at live.com>
> To: amps at contesting.com
> Sent: 27/04/2010 22:05
> Subject: [Amps] GS-35B optimum B+ for efficiency/power out
>
>
> Since I am designing from scratch, will the GS 35B, like the 3-500Z, produce more power and efficiency at a higher than ham amp-typical B+?   Say 4KV?
>
> Best Regards,
> 73, de Pat Barthelow AA6EG