MK-IV Prototype
A more compact version under test along side the larger MK III prototype. Cobbled together with bits of previously used wood and an old 19" 6U aluminium rack blanking cover.
Basic specifications are:
6059/CV4006 input pentode running as pentode
6CG7/6FQ7 phase splitter as LTP with a constant current sink in the tail
6CA7/EL34/KT77 push pull output at ~450V with cathode bias (around 19-20W idle dissipation using zeners to tighten things up towards fixed bias)
Sowter UP-21 output transformers, VVT chokes & Primary Windings HT transformers.
MK-IV Prototype
A more compact version under test along side the larger MK III prototype. Cobbled together with bits of previously used wood and an old 19" 6U aluminium rack blanking cover.
Basic specifications are:
6059/CV4006 input pentode running as pentode
6CG7/6FQ7 phase splitter as LTP with a constant current sink in the tail
6CA7/EL34/KT77 push pull output at ~450V with cathode bias (around 19-20W idle dissipation using zeners to tighten things up towards fixed bias)
Sowter UP-21 output transformers, VVT chokes & Primary Windings HT transformers.