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

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Posted by IslandPink (A ) on June 19, 2006 at 14:14:21

In Reply to: Re: C3g as driver for 300b posted by Paul Barker on June 18, 2006 at 21:47:27:

Paul,
You know I was using the 12GN7 with a 9.5K load as a driver for the VV32 amp ? So you don't need to use a really low anode load ; and you need something on the anode to 'use up' some of the high B+ voltage with something like the C3g . Ideally a C3g would need about a 350V supply for a driver in pentode mode - then you could use about 8K load and get a reasonable anode value ( say 230 v ) with 15mA and so keep the anode dissipation sensible . This would be a great driver with over 100 gain . The only problem with the C3g in 300B application is the limited dissipation of less than 4 watts . The C3m is a little better in this respect . I'm surprised T has said nothing about using it as a pentode yet .
Mark

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