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Old 20th October 2007, 10:06 PM   #1
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Question mu followers --- current --- please help

i have designed a mu follower circuit based on the one in morgan jones valve amps book,,, just wondering what the current drawn by a mu follower is.. also how do i work out what power rating resistors to use ,,

cheers
soundbadger
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Old 20th October 2007, 11:21 PM   #2
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Ina word, Loadlines (See under "Technocal Reports"; he has a five-parter that tells all about it.)
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Old 21st October 2007, 01:09 AM   #3
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Miles's link didn't work for me but I think he meant that the operating point needs to be chosen according the the plate curves. The load line itself will be almost horizontal b ecause of the high impedance that the mu-follower provides as a plate load to the lower tube. However, you still need to select an operating current based on the tube's characteristics. A rule-of-thumb approach is probably good enough here, i.e. use a high enough current for linear performance but don't go for too much plate dissipation.
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Old 21st October 2007, 03:54 PM   #4
pftrvlr is offline pftrvlr  United States
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I am building one mu-follower as headphone amp - with extra 6bx7 output cf stage. I use SPICE to set the operating point and check component power rating. Works fine for me.
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Old 21st October 2007, 04:39 PM   #5
Jeb-D. is offline Jeb-D.  United States
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Speaking of Spice. Soundbadger, your icon looks like it's from circuitmaker. I use the student edition which I got while in school. If that is what you have, I figured out to alter the model folder so that you can add more tubes to the library. I'll let you in on the trick if that's what you use.
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Old 24th October 2007, 07:46 AM   #6
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ive not used spice before, at college we use ewb multisim which is a bit limited. i just got a copy of pspice so ill see how i get on. i
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