6c33cb is an electronic tube originating from USSR or today’s Russia. Initially
it was invented by the Russian Army and it was kept as a tightly guarded army secret.
In 1976 certain Russian pilot navigating famous Russian MIG – 25 Jet Plane deserted
Russian Army by landing this plane on Japanese soil.As the MIG – 25 plane was the
latest technological invention of that time, japanese engineers were surprised to
find electron tubes inside the plane. Russian MIG engineers considered the smallest
details. Silicon-based semiconductors cannot tolerate the EMI burst from Atom bomb,
but tubes are fairly immune to this phenomena. Japanese audiophiles were excited
by the discovery of this particular electron tube. Soon the 6C33C gained popularity
in production of OTL amplifiers. In this way wider market became available and Russia
had started exporting them throughout the World.
Frame is hand made from oak-wood, rest from messing. I did not make an attempt to weigh it,
certainly it is not an object that can be lifted and moved around at one’s ease.
In Single-Ended amplifiers the main trouble is the small output power, meaning
that speakers of higher sensitivity are a must. In case of 6c33c-b there is
no need for sensitive speakers as the amplifiers has more than enough power
to generate realistic sound levels.
selector for 3 input
- 6H6 ; 6C33CB ; AZ1 tubes
- C- core output transformer
- Fix bias
/ MKP capacitors
- 60 sec
turn on HV timing
- Point to
- 0dB feedback