[Amps] R. MEASURES PRAYERS ANSWERED

[Steve Thompson]

R L Measures wrote:
> 
> On May 30, 2006, at 11:07 PM, Steve Thompson wrote:
> 
>>
>>
>> R L Measures wrote:
>>
>>> Just how the AL-1500's designer came to the conclusion that 5000-ohms
>>> of feedback XC at the tube's max freq rating could not cause
>>> oscillation is a mystery.
>>
>>
>> Maybe he didn't. Feedback C is but one of many factors contributing to
>> oscillation, and one over which the designer has no influence. Perhaps
>> he believed/designed/intended that other elements of the circuit
>> prevented gain>1 and phase=0 without the need for an anode auppressor.
> 
> 
> It must have have been a wishful intention, Steve, since there is  
> nothing unique about the 8877 -- in fact, its extraordinary gain- 
> bandwidth product should have been a pretty good clue that  oscillation 
> was something it could probably do.
Indeed - but anode suppressors are not the only way to prevent oscillation.

Steve