Tube Talk
TUBE TALK
New 12AX7
The new RUBY 12AX7AC7 is the latest tube developed at our Factory. It is the
quietest of all our 12AX7 type tubes, both in
terms of microphonics and mechanical noise.
To eliminate the mechanical rattles, we started with new, tighter tolerance
micas, redesigned the
plate structure and added new assembly controls to make the
RUBY 12AX7AC7 free of mechanical rattles caused by the vibrations
inherent in a high gain combo amp. The famous
sweet tone on the Chinese 12AX7 tubes was
preserved. In the process, we also got a significant reduction in the
microphonics of the tube. The new tube has the
same high gain as our popular 12AX7AC5 tube.
EL34BHT
We have had a great response to our new RUBY EL34BHT tube. Many
engineers have asked about what kind of power can
be expected from the EL34BHT. In our tests, we
used 600 V on the plates, 540 V on G2 and a bias setting of –54V. The
tubes idled at 25ma each. The power output from a pair of EL34BHT
tubes using these voltages was 70 watts at
clipping.
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