[AMPS] AL1500

[2]

>
>2 wrote:
>>
>>>
>>>2 wrote:
>>>>>Thus, when the wolf comes to the door with 40 or so
>>>>>amperes, the transistor shorts and does not interrupt the flow of grid
>>>>>current in time.
>>>>>
>>>>>We're still waiting for a specific reference to the circuit that has
>>>>>this design flaw.
>>>>>
>>>>There is no one circuit that has this flaw.  There are several.  I have
>>>>never seen an 8877 grid-I-trip ckt that used a >2a transistor.  If you
>>>>know of one, please enlighten.
>>>
>>>I know of no grid current monitoring circuits that behave as you
>>>describe - that's my point.
>>>
>>//  Some Alphas apparently C-E-short their interrupt transistor.
>>
>That's not very specific... and what exactly do you mean by an 
>"interrupt transistor"?
>
\   The active device whose job is to interrupt the flow of grid current. 
 The amplifier that the gold-sputtered 8877 in Figure 24 on my Web site 
was removed from a AL-1500, which has a grid "protection" circuit that 
apparently did not interrupt the flow of grid current.

>>>This ball has been in your court for some months, Rich. If there are
>>>"several" such circuits, you'll have no difficulty in naming at least
>>>one.
>>>
>>//  If grid-overcurrent protection circuits worked I would not be seeing
>>kaput 8877s with loose gold about.
>
>So you do have difficulty in naming even one specific circuit, then?
>
>-- 
cheerio. Ian

-  R. L. Measures, 805.386.3734,AG6K, www.vcnet.com/measures.  
end


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