Grannyring, this is something Paul designed and built by himself, which I bought from him. I was very happy wiith the way the amp sounded, but perhaps due to the unusual mixture of tubes, and how they interacted with each other, Paul decided a change of ouput tubes might be a better option for my use, and to better match with my custom-designed-and-built HPD 315 Tannoys.
Since the change in output tubes (I don't know what other changes he made), the amp is the most perfect match for my speakers since I first fired them up over ten years ago.
I am so in love with my system now, and so pleased every day. This is a blessing at this stage of my life, the end of days can come any time, and I'm good with that.
Not trying to be over-dramatic, but I am 76 years old, and have had one stroke a couple years ago, so who knows?
I insist on living a life with a positive outlook, and enjoying it happily in spite of some difficulties ( my 77 year old Dementia-affected wife I look after, and we still manage to have a bit of fun, and some of the music I play she dearly loves).
So I suggest you get in touch with Paul Birkeland (an extremely busy man these days). Paul Birkeland at Bottlehead Dot Com if they allow that to go through.
I have always had high regards for you, so I hope it works out for you.
Best regards,
Dan Thomason
Whidbey Island, WA