Ordered a Willsenton R300

@donsachs

but it is basically 4 single ended 300b amps in one box.

So is this a PSET rather than a push pull circuit?
My 300b SET uses the 6EM7 as the driver rather than the 6SN7 (For the reasons you mentioned). Also it utilizes an interstage transformer in place of coupling capacitors.

I have no doubt that your 300b amplifier will be a fantastic product. Best wishes to you. The 300b properly implemented is superb sounding.

Charles

@whitestix I'll give your Kootenay a good home if it ever comes up for adoption 🙂 do you use a Sachs preamp with it?

Hi

It is a push pull amp comprised of 4 individual SETs, 2 per channel.   Class A, zero feedback of any sort.   There are a couple of little tricks beside that, but that is the basic topology.  The OPTs combine the two out of phase halves of each channel.  Trust me it works beautifully.   I am not done tweaking.  The next iteration will have the custom ITs and be mono blocks because I can then fit more power supply tweaks in the boxes.  But the current one is the best amp I have heard to date anywhere.  Semi-retirement is fun:)

@donsachs

Thanks for the additional clarification. Push-pull topology, that explains the 27 watt power output from the 300b (4 of them). Zero negative feedback is a purist approach and I mean this in a very positive manner. Sounds like you and the esteemed Lynn Olson are developing something quite special.

Charles

I’m also interested in hearing feedback on the R300. Interesting to see dual mono rectifiers at this price. My gut is not to trust a directly hearted triode without him puts - unless they are there but not described. Hard to fault an amp if it sounds good and costs less than a tube change.