R L Measures wrote:
>
>On Jul 20, 2006, at 4:42 AM, Harold Mandel wrote:
>
>> The GM3SEK and WD7S Triode and Tetrode Controller boards,
>> when suitably integrated, when properly adjusted, serve to
>> protect tubes and power supplies in a much faster time frame
>> than fuses.
>
>Hal --- Does the GM3SEK / WD7S Triode Controller board for an 8877
>use a grid protect transistor rated at >50A?
Despite requests in the past, you have never provided a specific example
of a circuit that needs a "grid protect transistor rated at >50A".
The schematic of my grid-protection circuit is in the Triode Board user
manual which is downloadable from the website. The only transistor in
this circuit is a 2N2222 that senses a small fraction of the grid
current, and can handle even extreme fault conditions.
--
73 from Ian GM3SEK 'In Practice' columnist for RadCom (RSGB)
http://www.ifwtech.co.uk/g3sek
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