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In Reply to: RE: Suggestions for SE interstages on a budget? posted by jorisdallaire on January 19, 2015 at 20:31:03
That would be about the only reason to get that much current.
Really hard and expensive to go down the interstage road for A2 when there are alternative (and better) ways to do it.
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No, but i want to drive a GM70 which needs a power tube driver... And while not going to A2, one needs a bit of power as the signal puts the grid close to 0V...
As the other posters have said, save your money. Tubelab's PowerDrive will do everything you need, at relatively low cost.
BTW, the power MOSFET I'd use is the IRFBC20. That part's low and stable reverse transfer capacitance makes for superior linearity in voltage follower service.
Eli D.
Adding so many semis to a triode amplifier really does seem to defeat the purpose. Then again, the photo shows Chinese-made 845s. Maybe the goal wasn't hi-fi. :)
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Buy Chinese. Bury freedom.
I was very anti-solid state, but as Eli says, it is just a tool for a job. Like using a diode for the negative part of a full wave rectifier bridge or a diode in a a bias supply. The MOSFET as a source follower can do amazing things for very little money and is better sounding than the other options.
Exactly
I use the 10M45 on the tail of an LTP with superb results and like you said you are just subbing one part for another..As far as the voltage follower goes there is no gain there to have any real effect on the sound and FETs operate just like a vacuum tube being the are voltage operated.There is nothing with using all vacuum tubes for the function but there are very good solid state devices that can get you by pretty nicely.
"If it measures good and sounds bad, it is bad; if it measures bad and sounds good, you have measured the wrong thing."
- Daniel R. von Recklinghausen
Low reverse transfer capacitance MOSFETs are transparent in the voltage follower role. Also, SS based constant current loading of tubes is very, very, well proven. Therefore, it's NOT too much "sand". IMO, it's simply the right "wrench" for a particular "bolt".
Eli D.
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The Mind has No Firewall~ U.S. Army War College.
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