On Jul 20, 2006, at 3:50 PM, Ian White GM3SEK wrote:
> 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".
An example is any amplifier that uses an 8877.
>
> 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.
Does the 2N2222 interrupt the flow of grid current if the limit is
exceeded?
>
>
> --
> 73 from Ian GM3SEK 'In Practice' columnist for RadCom (RSGB)
> http://www.ifwtech.co.uk/g3sek
>
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>
R L MEASURES, AG6K. 805-386-3734
r@somis.org
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