V2b question

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chopperferrari
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V2b question

Post by chopperferrari » Tue Sep 13, 2016 6:56 am

Hi chaps,

I'm trying to get my head around how v2a &b function in the JTM45 - it seems to be different to the he way a lot of other amps have their 2nd gain stages set up. Can anyone help me get to grips with it? :scratch:

Why the shared 100k on the plate as oposed to one for each side like V1?

V2b cathode has just a 100k resitor - why this value? Seems like an awful lot more resistance than in a usual cathode arrangement? (2.7k, 1.5k, 820ohms)

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bill bokey
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Re: V2b question

Post by bill bokey » Tue Sep 13, 2016 12:00 pm

It's the cathode follower ;)

http://www.valvewizard.co.uk/dccf.html

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