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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: Re: Maximum volume with 300b amp and 98/db speakers posted by Jim Doyle on November 8, 2004 at 19:27:25:
The buffer/low gain linestage is a fine thing. One way is with a pentode cathode follower. Something really high gm. 12BY7 ought to do it...12GN7 would plug in and has ~3x the useable gm. CCS the load, put a medium sized negative rail underneath. Say 200V B+, -80, and a 20 mA CCS and a 5-10 uF coupling cap. Shunt reg the screen supply. Gain will be nearly one and output z dominated by the 'one over jay-omega-see' impedance of the couling cap. At miband it will be less than a hundred ohms...and input capacitance will be quite low from the screen in the pentode. Going to have to try that one...
regards,
Douglas
mmmmmhhhh...Forbidden Donut!!!
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Follow Ups
- but say what you really mean... - Sector-7G 05:19:55 11/09/04 (2)
- Re: but say what you really mean... - Frank 06:42:56 11/09/04 (1)
- Re: but say what you really mean... - Sector-7G 07:37:46 11/09/04 (0)
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