Had one of those in a secondary system some years ago, and was never dissatisfied with it. The mention of it in this review of the 150A is absolutely correct for how it sounds. It is getting some age on it, so may require some maintenance, although, it was built from very high quality parts. AFAIK, the one I had is still in use today with no problem. One thing to keep in mind is that the input impedance is somewhat low (25K ohms), so a tube preamp with a very high output impedance (above 2.5K ohms) will not mate well.
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