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The Power Amplifier KEW807-91B seen in this page was and
is, with some small exceptions, my first attempt in building a cheap but
good stereo Williamson tube amplifier. The MkI-differences are the mains
transformer (KE77003-B vs huge ABB EI-core 1:1), the output transformers
(ABB C-cores vs std 30VA mains toroids), true Williamson biasing (rectified
350V vs 230V) and the black paintjob. The amplifier comes with a Party-Plug
visible in the upper right corner. The 5U4GB may be changed to this
Party-Plug whenever tube distorsion becomes too irritating. The OPT's are
made of outstanding ABB C-cores and my Siemens QE 06/50's (i.e European 807)
was actually, until recently, still working! That is almost 10 years of warm
tube sound!! |
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