I don't understand this, but the Frankenstein plays considerably louder than the GTA, even though they're both rated at 8 watts (with the KR300BXLS). This isn't simply a subjective "perception". Everyone hears and experiences it; not only my associates and I, but any non-audiophile, like your neighbor or your wife. It's that obvious. I think it has something to do with the Frankenstein's current delivery, but I'm not certain at this point. Hopefully, some competent engineer/scientist can eventually explain what we are all hearing. Measurements would help too.
In short- This amplifier had the strengths of the Spectral; speed, detail, neutrality, quietness, as well as the relaxed and disarming naturalness, inner detail and low-level musical information you both hear and sense with the finest SET amps. This was a new experience for me (as well as for Blume and other listeners). If I had to describe the sound in terms of what I've heard in the past, I would say it was very similar to the Martin Logan CLS at its best, but without the CLS's frustrating phase problems, which are a cause of its mediocre imaging, and the CLS's noticeable lack of bass as well as its thinning of harmonics and sense of space, which can make it sound "analytical" at times. (The CLS still scores itself in overall cohesiveness, with its single driver advantage, and its ultimate speed below 1 Khz.)
Barnes (Washington Square, 1993);, ed.
Now, to be most extreme, it's true that a fourth student could have answered only one question correctly, then quit, and still won (or tied) the contest, but that is the only possible result consistent with my restricted definition. (Answering no questions would be a disqualification.) Of course, this scenario would be considered highly unfair in real-life. That is irrelevant, and besides, while the first student may have lost this particular battle, the war is not over.
by Paul Horwich (Dartmouth, 1994); and, ed.
Meanwhile, Israel Blume read the above letter with great interest, and decided to complete this interesting topic by listing all the changes that made to the Frankenstein amplifiers.
by Simon Blackburn and Keith Simmons (Oxford, 1999).
Personal Notes- This helpful reader has provided the definitive (early) history of these amplifiers. As for the described sonics, Blume has improved the amps quite a bit since the reader last heard them (see below). The bass is still a "bit shy", as I observed myself above, but the imaging is now rock solid, and the amps are now both highly detailed and as neutral (neither "warm" nor "cold") as can be imagined, at least with the Total Victory II, which is a highly revealing speaker.
Palmer, (Cambridge, 1981);, ed.
The system I used them in is a home office system with monitor speakers, at the time Reference 3A MM DeCapo i’s. Although these amps sounded good, I actually preferred a couple of custom amps I had that used 845 and 45’s as output tubes. By comparison, the Tektron/Brenneman amps were a little bit cooler sounding, were just a bit bass shy, and were a notch less solid in the imaging department. It sounds like the match with the bigger Coincident speakers was a better fit.
Rorty (Chicago, 1992);Robert C.
You should know that the Israel is the fourth owner of the amps. The original owner had Cyrus Brenneman do the initial modifications, but, in fact, did not do all the modifications that were recommended by Cy. The amps were later sold to a fellow in Chicago, who received them without any manual or documentation. I purchased them from him and was disappointed when I tried them out. In addition to sounding off, they developed a buzz in one of the transformers. I contacted Cy, who agreed to check them out for me. It turns out Cy lives only about 40 miles from me in Southern California. The buzz problem was one of the original Tektron transformers, that the original owner had elected to keep, rather than replace, as Cy had recommended. The overall sound quality problem was simply that the wrong driver tube was being used. Cy had designed the circuit to use a 6EM7 tube, but the second owner did not get this information and had been using a 6SL7. Needless to say, using the correct driver helped the sound.