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In Reply to: RE: BDT Preamp Schematics posted by jkeny on May 16, 2008 at 08:13:20
Many different MOSFETS will work fine for Q1 and Q2. Do not substitute for the LND150s. You want enhancement mode N channel at a voltage rating that can take anything you will be throwing at it. For most tube circuits that are running under an amp of current you want to use a power mosfet designed for relatively low current, ie in the 1 amp range not the 40 amp range.
I personally have used at least six different part numbers and they all have worked fine.
John S.
Follow Ups:
Aha, I think the schematic shows IRF1820 rather than IRF820 - this is what confused me!
Aha, the "I" stands for "Insulated", the tab is insulated from the pins so you can screw it into a heatsink without needing mica insulators, nylon washers etc. Especially with the high voltages floating around these circuits I like to not have the HV where I could touch it!
John S.
I'm sorry John, I didn't spot the "I" - interpreted it as a "1", doh!!!
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