Gary Tayman did my 33/34 Ashtray radio Its now AM/FM Bluetooth and MP3 compatible , Delivers about 45 Watts of sound , Runs on 6V Positive Earth and looks completely stock standard and even has that warm valve sound and delay on turn on - I spent a lot of my teenage years trying to play bass guitar through valve amps in bands and I don't believe I would be able to spot that the radio is now solid state if I didn't know.
He's in Florida but the distance made no difference other than the cost of getting it there and back from New Zealand.
He kept me informed the whole way and was great to deal with.
I tried Turnswitch originally but never got a reply to my emails. I'm not sure why they didn't respond but very happy I went with Gary This is is website
http://www.taymanelectrical.com/
Karl