Hi
The technical datasheet of a GS35b talks about 700mA a 800mA anode current
by a wavelenght of 30 or 60 cm.
The typical anode current by wavelenghts of 10 M tot 160 M should be another
question,nothing is found around.
Same about the correct BIAS currrents of this tubes !!
I do not found real exact values,most guys are talking about 200mA for a
GS35b-tube ?
Running more BIAS or anode currents will surely destroy the life time of the
tube ?
73's Jean.
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Sent: Thursday, June 24, 2010 9:00 PM
Subject: Amps Digest, Vol 90, Issue 30
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> 1. What Is TheOptimum Bias For GS-35b Tubes? (Mel)
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> Message: 1
> Date: Thu, 24 Jun 2010 10:35:46 -0700 (PDT)
> From: Mel <itz_da_police@yahoo.com>
> Subject: [Amps] What Is TheOptimum Bias For GS-35b Tubes?
> To: Amps@contesting.com
> Message-ID: <964585.87095.qm@web111408.mail.gq1.yahoo.com>
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> I have a GS-35B Bias question.
> I constructed a 2 tube GS-35B amplifier; it has separate filament
> transformers and bias systems for each tube.? My transformer runs 4200 VDC
> unloaded; I set the Zsac for each tube separately, I have each tube
> running at exactly 425 mills at idle.? At 425 milliamps, the X-former
> drops to 3900 VDC (with one tube disabled by removing cathode fuse).??
> Both tubes are set to draw the same amount of current.
> ?
> When I put both tubes in service, instead of getting 850 mills of Zsac, my
> idle current is 740 milliamps and my B+ is at 3750 VDC.
> ?
> With RF drive the B+ dropped to 3375 VDC @ 2.0 amps and delivered around
> 4000 watts output; at increased drive levels, the B+ did not drop any
> lower than 3375, it? (the X-Former just drew more current from the mains;
> I took plate current up to 3.5 amps and B+ held solid).
> ?
> What?s the optimum level of bias to run on a GS-35B and, based on my
> observations, should I crank my bias up a little higher in setup knowing
> that when the 2 tubes are run together they drag the B+ down which changes
> the affect of the bias setting?
> ?
> There is a lot of information at GS-35B DOT com but, I would really like
> to hear from someone with recent experience on their construction /
> conversion using the GS-35B tube.
> ?
> ko?m
> ?
> http://www.network54.com/Forum/142608/
> ?
> .
>
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