VAC PA160 Mk I - Manual (Page 2)

2
Introduction
The PA160 is a wideband low-feedback monoblock power amplifier producing approximately 160 watts
per chassis in standard trim. It is largely based on the critically acclaimed VAC PA90C-1 circuit, which was
has been praised by many authorities since its introduction in 1990. This improved version delivers a new
level of performance, musicality, flexibility, and convenience.
Premium parts are employed throughout, including 14 pound 22 section bifilar-wound ultra-wideband
output transformers, polypropylene and polystyrene signal capacitors, high current rectifiers, low ESR power
supply, and proprietary wiring. The quality of parts and careful layout allows the use of very little or no
feedback for high sonic purity and low distortion.
Your VAC Power Amplifier is designed not to the latest fad but to substance, providing the highest quality
of sound. Time spent familiarizing yourself with this manual will be well rewarded.
"Universal" is descriptive of the PA 160's ability to adapt to virtually any system context. Some of the
features of your power amplifiers include:
- configuration switches allow the use of KT88, KT77, KT66, 6550, EL34, or 6L6GC output tubes
- 160 watts power output with the fabulous new Golden Dragon KT88 (standard)
- switch for triode, ultra-linear, or beam power/pentode modes of operation
- user variable negative feedback
- adjustable ground configuration switch to best compliment the associated preamplifier
- multiple impedance taps to match loudspeakers from 1 to 8 ohms from massive 21 section
wideband bifilar output transformers
- high current capability
- XLR and RCA input jacks for compatibility with balanced or single-ended sources
- simple front panel bias indicators and adjustments allow easy monitoring and optimum performance
(no meter required)
- balanced push-pull circuitry, with push-pull conversion in the first stage to better exploit the inherent
advantages of push-pull operation and to allow improved performance of the driver stage
- audio path completely hand wired, allowing components to perform nearer to the theoretical ideal
- non-magnetic chassis
- energy storage is distributed inside the chassis to place it nearer to the point of demand and
dedicated to particular uses, ensuring superior isolation of the various stages.