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An aside your thoughts suggested...

Posted by JamesD (A) on December 7, 2003 at 05:16:45

In Reply to: Mo' Thoughts posted by Lynn Olson on December 5, 2003 at 15:50:06:

Hi Lynn,

I need to think some more about what you have written before a proper reply. It's interesting and it has stimulated various ideas for me to pursue.

However one thought that did occur to me was a solution I have been trying to find to a very low capacitance balanced input that I wanted to build from triodes. The reason for the low capacitance requirement was the usual, I want to use a 11:1 fully balanced stepup transformer and the input capacitance gets a bit hairy when multiplied by 121 times! Even pentodes can be a bit heavy with this input trannie. However if we take two diff pairs and construct them from a pentode on the input side in cathode follower mode into the CCS tail and a common grid UHF triode on output side then we get - to some degree - the best of both worlds. Using two of these with the triode anodes feeding a PP interstage completes the picture. The triode distortion characteristic and sound would dominate and balance between the two diff pairs is acheived by tweaking the CCSs. I hope the picture above conveys my thinking... Maybe this would work as a low capacitance front end for the Amity? When I get time I think I'll knock this up, I guess I need pentodes and triodes that bias up to similar points...

ciao

James

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