I’ve been following … no … have been massively influenced by Lynn’s Karna amplifier and the reasons behind the topology. My first effort is on Lynn’s site as the PP813 Grand Aurora so I’ve been at this for about 20 years.
It has now morphed into all DHT with finals of GM70 so not part of the discussion in a 300B thread.
These types of amplifier are not easy to get right. Even though the signal path is ridiculously simple, it is still challenging and the supporting power supplies are anything but easy. Finally after all this time, I’ve succeeded in getting to the sound I was after.
Probably as I’m not in the position to commission a super IT and maybe as my current one is not so super, I’ve ended up DC coupling the 1st to the 2nd stage in a similar way to Kevin Carter’s method; choke loaded 1st stage.
Don mentions in the thread DC coupling was not an option for a commercial product, but I’m left wondering, was this method evaluated in the many permutations of coupling configurations for the front end?
I’ve also got a line stage, which again, is heavily influenced by Lynn’s designs; the Raven but using 12B4; initially used as a headphone amplifier. The system is better for it being in the chain than out despite having no gain.
Many thanks to Lynn for providing oodles of thought-provoking posts over the years to fuel the ideas leading to the success I’ve had.