Tube DIY Asylum: Re: C3g as driver for 300b by Paul Barker Do It Yourself (DIY) paradise for tube and SET project builders.

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Posted by Paul Barker (A ) on June 18, 2006 at 21:47:27

In Reply to: Re: C3g as driver for 300b posted by horny on June 18, 2006 at 15:30:39:

Friend of mine very much recomends it as a high transconductance pentode driver. His view is that for pentode drive you get best results from valves of the sort you are talking about.

I haven't studied the valve, but for pentode operation you should ideally use a vr tube (paralleled with a series rc network to fix noise) as the stable screen voltage mechanism, plus a small cap screen to cathode (not ground).

For single ended (as opposed to differential) pentode operation you must use resistive load of very low value. Lowest you can get away with sufficient for enough voltage gain. Output impedance is effectively the value of this resistor, gain is increast the greater it's value, linearity particularly at high current low voltage end of the swing is improved the lower the value. You balance the situation for yourself.

Never use an inductive load or a ccs.

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