I used the #BR-1 speakers from Parts Express, which, although not super high efficiency, sound really good with this amp. I had some Hammond output transformers handy, #1645, and the load of the primaries on these transformers gave me the necessary load for the 6BQ5s into my 8Ω speakers. It held all of the components and has a nice open look, giving the tubes good spacing for keeping things cool (Photo 1). I ordered a chassis from Antique Electronics Supply (AES, ) and found that the Hammond #H1444 was the perfect size at 12" x 8" x 2". The 6BQ5 sounds great in push-pull, but what would it sound like in single-ended triode mode? I had a few of these tubes in stock in my hobby room, so I dug out the parts I would need. I have built some push-pull amps using this wonderful, hard-working little tube, but even though they were fairly simple in construction and low in parts count, I wanted to build one for first-time builders, and one that would sound really good. (All tube model, unpainted chassis.)Ī friend of mine, Neal Haight, who has contributed many of his great ideas to this magazine, recently mentioned a lack of articles regarding what I consider to be the king of the “baby bottles,” the 6BQ5/EL84 power tube.
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