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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: SCA-35 rebuild/mod -- some questions posted by Eli Duttman on March 18, 2007 at 21:30:49:
Any suggestion as to the follower resistor value? That's not specified in the MOSFET Follies, although a 220 ohm gate stopper IS suggested. As a very rough quick and dirty calculation, the plate voltage in my SCA-35 phono stage runs around 200 volts with a 260 volt B+, so a 100 kilohm follower resistor should give a bit less than 2 mA through the MOSFET, which will result in a resistor dissipation of 0.4 watts (use a 2 watt resistor) and a MOSFET dissipation of 0.12 watts which should be safe. Of course I tend to design conservatively. Not a great deal of current drive but certainly better than the 12AX7.
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Follow Ups
- Ah, that's more interesting, then. - JimL 18:21:24 03/19/07 (1)
- Re: Ah, that's more interesting, then. - Eli Duttman 19:31:21 03/19/07 (0)
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