There may have been some V12’s with only four diodes. Two strings of two in series but mostly it should be the later that I explained.
My dual-mono amps I built have essentially the V12 input circuit but using a 6SN7 instead of the 6922 and are fully balanced. The output is essentially the SLAM-100 but with everything taken to the maximum. I have large cap banks and 10Hy chokes on the B+ and running 550VDC to four KT-150 tubes. Then another 20Hy choke before the regulator circuit for the input tubes. Lots of Polypropylene al through the PS. I get a very nice 124 watts per channel output. These drive my Eminent Technology LFT-8b speakers that I’ve completely rebuilt the crossovers. I use a couple Rythmik F12 subs for the low end driven by the preamp with balanced cabling. Going fully balanced made a big improvement in imaging for me.
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