Page 3 - PR_Jubilee_300B_STEREOPLAY_2019_09_EN

push­pull pentode designer – the most urgent problems of the
has recently become addicted single­ender had already been
to the single­ended virus, yet solved here in an ingenious way,
by no means gone crazy. For­ i.e. the anode current preload
tunately, we need to admit, be­ of the output transformer. Sure,
cause (apart from a very few on the occasion of the V16 re­
exceptions) there has been so­ view (stereoplay 5/17), Andre­
phisticated boredom and tech­ as Hofmann had already con­
nological gridlock with the firmed with a twinkling eye to
300 B topic. True, simple “take care“ of the 300 B as well.
“short“ circuit layouts and good But with regard to the size of
parts can soundwise substanti­ this project, the designer kept a
ate the hype of the single­ended low profile.
300 B amps established by an
ancient Western Electric cinema Single-ended parallel mode
amplifier, but the fundamental The Jubilee 300 B renders trip­
problems of this design, starting le homage to the famous triode
with low output power, re­ by wiring no less than three of
mained unsolved. these valves in parallel for in­
The first hint into the new creased power. This results in
direction came with the Octave 30 watts of nominal output and
V16 Single Ended, an integrat­ thus compatibility with many
ed and headphone amplifier loudspeakers. What’s more:
which used the indirectly heat­ with his new amps Andreas
ed “modern“ KT120. One of Hofmann has managed to solve

An energy management for the supply and heating voltages ensures
a long valve life, a protection and overload system keeps safe from
operating errors and valve malfunctions. The quiescent current of the
three power valves is checked by a measuring device with a digital
display.

09/19 stereoplay.de 13