On Oct 17, 2020, at 11:14 AM, Goran Finnberg <mastering@...> wrote:

Henry Griffin:

>whether SAE used non-inductive emitter resistors in the 3100.?
>Still looking for the answer.

I knew the SAE agent here in Sweden.

I repaired faulty SAE gear in my part of Sweden.

I asked the factory via Telex about the emitter resistors and the straight
answer was that they were normal inductive power resistors.

Nothing fancy at all.

I will say that this answer is what 99.9999% of all amplifiers at that time used.

With the best power transistors having an Ft of barely 2 MHz and the closed
loop unity gain at around 500 kHz to keep the amplifier from oscillation due to
cumulative phase shift, Nyquist criteria,? there simply would not be any use for
non-inductive resistors.

Modern amps using ring emitter power transistors with an Ft of 50 MHz might use
non inductive emitter resistors if the designer felt it useful.

But even today most normal standard product do not use non-inductive emitter
resistors for the gain is zero and total Bill Of Materials, BOM, cost must be held
as low as possible to meet the target price in the street and still allow a profit.

_._,_._

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Best regards,

Goran Finnberg
The Mastering Room AB
Goteborg
Sweden

E-mail: mastering@...

Learn from the mistakes of others, you can never live long enough to
make them all yourself.??? -?? John Luther

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