TOPAZ 572B STEREO AMPLIFIER
SPECIFICATIONS

TUBE COMPLEMENT

1 octal base 6SN7WGTA dual triode
1 octal base 6BX7GT dual triode
2 SV-572-10 SVETLANA large triode rated for 125 watts plate dissipation

CIRCUIT DESCRIPTION

All stages operate in class "A1" single ended and contain automatic self-biasing circuitry. Our exclusive use of exceptionally large value Solen polypropylene coupling capacitors is one of the reasons for our extended low frequency response. Each Svetlana directly heated triode ( DHT ) drives its own exquisitely refined Audio Note output transformer to get 23 watts RMS per channel in pure CLASS A1 operation. The output transformer windings from each channel can be switched via dual contact high current switches to allow the selection of speakers rated for 4 or 8 Ohms. WE EMPLOY NO FEEDBACK of any kind due to the low distortion ultra-linear amplification stages employed in our design.

POWER SUPPLIES

MECHANICAL CONSTRUCTION

CIRCUIT BOARDS
(Hand crafted Vectorboards using precision double turret terminal posts)

The components are mounted on Vector boards which contain swaged terminal post. These posts are divided into two areas. The wiring used is laid out on both top and bottom of the board and is soldered to the bottom layer of the terminal post. This point to point wiring allows the highest possible component density while maintaining the shortest possible SIGNAL PATH! The components are then soldered into place on the top layer of the terminal which allows the replacement of any part without removing the circuit board. High quality Teflon coated Silver plated OFHC copper wiring is used where appropriate and silver solder is used throughout.

AUTO-SEQUENCING
(60 second power on cycle)

Three time-delay relays provide extended tube life and proper power sequencing for stabilized circuitry.

POWER SWITCH SETTINGS A 3 position toggle switch provides ON, OFF and STANDBY functions
IMPEDANCE MATCHING Two high current toggle switches enable setting for 4 or 8 ohm speakers
FREQUENCY RESPONSE +/- 0 dB > 100 Hz to 10 kHz
-1 dB > 20 Hz to 25 kHz
-3 dB > 16 Hz to 37 kHz
INPUT IMPEDANCE 200 kW
ABSOLUTE PHASE non-inverting
GAIN 25 db (0.75V RMS maximum for full output)
DYNAMIC HEADROOM 4 db (short duration music peaks of up to 90 watts for extended dynamic headroom)
POWER OUTPUT 23 watts RMS per channel
POWER CONSUMPTION 375 watts
WEIGHT NET: 102 lbs ( 46 kg )
SHIPPING: 117 lbs (53 kg)
DIMENSIONS 16" W x 22" L x 10" H  
LIMITED WARRANTY TUBES 1 YEAR PARTS
  COMPONENTS 3 YEARS PARTS & LABOR
EXTENDED WARRANTY COMPONENTS ONLY 20 YEARS PARTS & LABOR (See warranty registration)

LIMITED EDITION

Each unit comes with a gold plated brass nameplate individually engraved with its own unique serial number.