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Which First Watt amplifier do the Pass Labs Class A amplifiers follow in terms of typology?
Observe, before you think. Think before you open your yap. Act on the basis of experience.
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Nelson has taken a different approach with his "kitchen table" line.
Both, however, are brilliant in their own right. The SIT-1 is the only single transistor amplifier I know of and has reportedly phenomenal performance within its modest power output using the common First Watt chassis shared by all models.
On the other hand, the Xs300 amps are 600 lb gentle giants to drive the most demanding loads. Heck, the matching preamp weighs 80 lbs!
1st watt & Pass Labs are (2) different topologies.
The Pass Labs class A amps are all push-pull with a large number of output transistors. The First Watt amps are single ended zero feedback solid state amps with 1 or 2 transistors. I have seen both and they do not resemble each other other than possibly the fact that the Pass Lab amps use a simpler driver than is usually seen (fewer parts and therefore better etc.) If you want to ask him, you can try his page at DIYAUDIO.
First Watt are not all single ended and some have feedback. The latest F6 is both push pull and has feedback....same with F5. J2 is single ended but has feeback. Please see this link for correct info: http://www.firstwatt.com/prod.html
First Watt is one or two stages whereas Pass generally uses 3 stages. Both Pass and First Watt use nothing but fets (except for possible bipolar cascodes) and all First Watts are class A biased and most of the Pass amps are at least partially Class A.
Thanks.
Observe, before you think. Think before you open your yap. Act on the basis of experience.
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