|The QPSA-7 is a High Voltage (> 100
Volts) Quad Servo Regulator system. Consisting of a floating (LM-317) pre-regulator
and four independent OP-AMP servo regulators, a single QPSA-7 assembly can provide
the complete and independent regulation to each stage of both line and phono sections of
vacuum tube preamplifiers.
The QPSA-7 is the seventh generation of the PSA-1 regulator module we
originally developed (and patented) nearly 20 years ago (used in the
"Paoli" modification to the Audio Research SP-3 & 6 series of preamps).
It provides to other products the same regulation performance found in
our Reference products and those developed for Sonic Frontiers. The
PSA-1 will dramatically improve all areas of the frequency spectrum with
tighter bass, increased midrange transparency, and silky smooth highs.
In addition, dynamics and imaging will be significantly enhanced. The
QPSA-7 module represents the ultimate in sonically neutral high voltage
regulator performance. Its small size and modest current requirements
allow the user to easily update existing preamplifier power supplies and
extract the pinnacle of performance from low level tube circuits.
The QPSA-7 is available in blank board, board kit (board & all parts), or assembled board. The assembled
board will be delivered to the voltage output desired and will be tested and
certified before shipment. For those purchasing the blank board set, we have
available the QPSA-7 Semi-Pac that contains all of the semiconductors
specified for the project. Standard and premium (high grade regulator
op-amps) Semi-Pacs are available.
PC Board Set : P/N PWB-QPSA-7 = $73
Semi-Pac Standard : P/N
SEMI-Q7 = $38
Semi-Pac Premium : P/N PSEMI-Q7 = $60
Kit, PC Board & Components: P/N KIT-QPSA-7 = $182
Assembled PC Board : P/N ASM-QPSA7 = $217