Schu, I got the Triode single ended 6550 with a LP-3a preamplifier .... as far as comparing the two amps, that would be a real shootout... they both sound good, the dynaco was built by someone learning to build amps and i invested my money in him a learning, he is from jacksonville fl and i think he did a wonderful job, it has a black wood panel on it also, custom built...
Ill hook it back up tonight and take a listen again after listening to something else... i do know it has more upper range weight than the 6550... the 6550 has more bottom and a more full mid... i think... , i just not sure how i want to hear it.... i feel the 6550 has more bass than i want, but rolling tubes to get it better.... maybe ill hook up my dynaco and compare them tonight, a good listening session... yes, thats it, a listening session... with a smile..... tubes im a playing with
NOS tungsol 6550
MELZ (6H9C) / 6SL7 / 1579
Mullard-Blackburn 5AR4/GZ34
Sylvania 6SN7GT
CBS/ Hytron 6SN7GT
GE 6SN7 GTB
Shuguang Treasure Cv181-Z
Bruce