[Amps] gu-84b anode voltage.

[Mike Bondarev]

Hi, Jan.
I'm in process of building such amplifier. I'll use 3 phase HV PSU
with 3kv out. As I know from some friends of mine here in Russia, GU-84B works
fine up to 3400V. You only have to do the following:
1. Turn on heater voltage and bias voltage and wait up to 12 hours
2. Run your amplifier with half plate voltage (say 1500-2000 V) on 21-28 meg
during few hours.
3. Let's go full KV

Regards, Mike RL3BM


> Hi,

> Has anyone built an amplifier with a gu-84b tetrode? In the datasheet
> the maximum anode voltage is 2.2kilovolt, but I've found a few websites
> where they apply 3.5 to 4 kilovolt.
> I wonder if this is a good idea, and if the life time of the tube is
> changed with this higher voltage.
> Who has experience ?

> best regards,
> Jan , ON6ZG

> www.on6zg.be