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In the Forum: Analog Playback
In the Thread: Where are our good phonostages?
Post Subject: Re: High gm pentodesPosted by Paul Scearce on: 10/3/2004
I haven't heard of these tubes before, but a search of the data showed some pretty impressive specs. Are you using the input tube near the recommended current of 36ma. I've seen designs based on high gm tubes running at much lower current than the tube was designed for. This lowers the gm to the point that I wonder what was the point of using a high gm tube in the first place?

I've built a phonostage using pentodes in the past. I liked the sound, but the pentodes' gm were too low for really quiet operation.

Paul

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