On 2/29/2012 11:09 AM, n8de@thepoint.net wrote:
Data sheet: http://danyk.wz.cz/gu81.pdf
> Here is the info you need:
>
> Specification
>
> Model number: GU-81M
> Manufacturer: Reflektor (Russian)
> Max anode dissipation: 450 W
Or 600 W momentarily.
> Max g2 dissipation: 120 W
> Max g1 dissipation: 10 W
> Max g2 voltage: 600 V
> Max anode voltage: 3000 V
Rated Plate voltage is 3KV below 6 MHz, 2.5 KV below 24 MHz and 1.5 KV
below 50 MHz
These tubes are regularly abused <:-))
> Max anode current: 600 mA
> Max g2 current: 120 mA
> Max g1 current: 20 mA
> Input capacitance: 29 pF
> Output capacitance: 24 pF
> Anode to g2 capacitance: 0.1 pF
> Max frequency: 50 MHz
>
> Looks like 900 watts output with 67% efficiency.
Rated at 750 nominal out.
> 73
> Don
> N8DE
>
>
>
> Quoting Máximo EA1DDO_HK1H<ea1ddo@hotmail.com>:
>
>> Hi all,
>>
>> I found a schematic with GU81 grounded grid.
>> What you think?
>>
>> http://ru3ga.qrz.ru/LAMP/200401.htm
Looks interesting.
>>
>> By the way, How much output power can we expect from GU81 GG ?
The Europeans regularly get 3KW out of a pair so one should do the legal
US limit although a pair would not be working them so hard and would
still be within the actual ratings. Don comes up with a nominal/PEP? of
900 so a pair would easily get 1800 in gg without undue stress. How
much drive it'd take, I don't know.
73
Roger (K8RI)
>>
>> Thanks
>>
>> 73, Máximo - EA1DDO
>>
>>
>>
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