Join the search for the Holy Grail and you will always be happy. Am collecting a harem of amps, waiting to be able to buy an OTL Tenor pr, so can compare. New Sovtek 2a3's are very good, but the nos USN are sweeter. The tubes you use are critical on both amps, as is the bias. For 300B, I can find many tubes review articles and comparison. As all know that one of the fun in tube amp is that one can always switch different tube to get different sound quality. I am currently using the Sovtek 2A3 tubes. also waiting to see how much $ Jack Elliano will charge me for new silver trannies for the 300b's. I just made my first tube of a SE 2A3 amp. Am waiting to see if the new Sophia tubes can sway me even further. If I could pick only one pr to live with forever, would pick the 300b's by a slight margin. The 300b's have a wonderful midrange, a fuller lower mid (cello, double bass) and a guttines on all strings that reminds me of live, which is really sometimes even sqeaky, unless Gil Shaham is using his Strad. One half of the 12AT7 is configured as an actively loaded voltage amplifier using our Camille Cascode Constant Current Source for super quiet, dynamic, linear performance. The input stage of the Stereomour II consists of a pair of 12AT7 tubes. My pair of amps has silver output transformers so these are very quick and transparent, and again, very sweet. Stereomour II Stereo Single Ended Integrated 2A3 Amp. The 2a3's are sweet as they could be, particularly great on clarinet and flute, as well as piano. I have been comparing the two tube types on my Lowther Lamhorns, using amps from Electraprint audio, built by Jack Elliano himself, monoblocks, one pr built as 2a3's using nos tubes USN dated 1943, the other pr as 300b's using Sophia mesh Princess tubes(a new pr of Sophia's arrives tonight, having been assured by Sophia that they are an improvement.
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