Aesthetix Callisto - Manual (Page 4)

TECHNICAL DESCRIPTION
NOTE: The following is a detailed technical description of the circuitry
employed in Callisto. It is intended for technically inclined readers for
informational purposes only.
Callisto comprises two separate units, the Linestage stage itself and the
power supply unit. The units are connected together via two detachable
umbilical cords.
The main unit contains one main amplification section and an output
buffer section. The first section is a medium gain, low noise, zero feedback
(or 6dB feedback from single ended sources) differential amplifier
composed of a 6922 and a 12AX7. Lastly, the signal is buffered and sent to
the output jacks in balanced form. Each separate amplification section has
its own power supply filtering network and regulated heater supply to isolate
the individual sections and prevent them from interacting.
The Power Supply has two main sections, the heater power supplies and
the primary plus and minus power supplies. The heart of the heater supply
is its massive, low flux, 210 volt-amp power transformer which has no less
than fourteen separate secondary windings that are individually regulated
and supply both the power supply and main unit tubes. The primary high
voltage supply is composed of a similarly massive 170 volt-amp transformer
which feeds a common-mode choke input filtering network and then high
current vacuum tube regulators (one EL34/6CA7, three 12AX7 tubes per
regulator).
Each regulator is capable of supplying 600 volts at 100mA. There are two
such regulators in the power supply.
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