Vintage Yamaha Pro amps - Cascoded sections

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Hi Everyone,

I've been doing some research before assaulting the pair of Yamaha P2100s I own, and perhaps creating new differential input stage as well as making room for better AC coupling than original. I just spent $150 on balanced input cables and I intend to use them! :D

I'm curious as to whether anyone has done an in -depth analysis of the input stages.

There are a pair of cascoded amplifier stages, which then connect to the drivers in a single ended fashion. Further, to do this Yamaha added 2 new secondary windings to provide an extra (-) rail.

This idea seems to have been taken forward to the P2200, some home amps as well.

Closest things I could find are mentions by Nelson Pass and a very interesting set of analysis done regarding "circuit memory" and amplifier linearity.

Thanks!


Erik
 
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