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In the Forum: Analog Playback
In the Thread: Where are our good phonostages?
Post Subject: Low gm pentodesPosted by Brian Clark on: 10/3/2004
When I was in discussion with Thorsten I actually had the low gm Telefunken EF 804S in mind. This was a valve specially developed for their studio microphone preamplifiers, designed to have minimum self noise so probably the best thermionic amplifying device ever made for low level audio circuits. Unfortunately they are rare and consequently expensive. The very similar EF806 is almost as good and more common.
So I guess there is more than just gm involved when assessing pentode suitability for sensitive applications.
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