[Amps] GS35B grid current

[Gary Schafer]

Thanks Jeff.
That is about what I found. I could only tune up to about 800 mA and got
about 1100 watts out with 2500 volts on the plate. Grid current ran around
250-300 ma. I couldn't find any info on the GS35B with 2500 volts on the
plate. I think that off resonance it would draw about 1 amp. 
I had to reconfigure the grid meter circuit for the GS35 from the 8877 to
allow for the higher grid current.

I did look at the ND2X site as well.

I need to put together the bigger power supply. I just stuck the tube in the
amp that I had an 8877 in to see what it would do.

73
Gary  K4FMX

> -----Original Message-----
> From: jeff millar [mailto:jeff at wa1hco.net]
> Sent: Saturday, January 30, 2010 4:18 PM
> To: garyschafer at comcast.net
> Cc: amps at contesting.com
> Subject: Re: [Amps] GS35B grid current
> 
> Gary...
> 
> You will see only 10 dB gain at 2500V...so about 1000W out for 100W in.
> Plate current can swing to 1A, but you may not be able to get it much
> above 800 mA. Grid current can get very high compared to an 8877, you
> may see as much as 200 mA.
> 
> Here's a bunch of operational data
> http://www.nd2x.net/tube-ops.html
> 
> Note that nobody on that list runs them at only 2500V. If you were in a
> Russian tank, it might be a good idea, but for hams the tubes don't
> really start to operate well until the plate voltage gets above 3500V.
> 
> Ignore the whiners about data sheet specifications.
> 
> jeff, wa1hco
> 
> Gary Schafer wrote:
> > Playing with a GS35B on HF.
> > what kind of grid current should I see with 2500 volts on the plate?
> >
> > How much power out do you see with that kind of plate voltage?
> >  How much plate current?
> > With 100 watts drive.
> >
> > Thanks
> > Gary K4FMX
> >
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