TRANS MOS VSP LABS AMPLIFIER 150 WATTS STEREO 300 WATTS MONO CHANNEL FREE SHIP

This listing is for an unknown operational condition TRANS MOS VSP LABS AMPLIFIER 150 WATTS 8ΩSTEREO 300 WATTS 8ΩMONO CHANNEL  as can be seen in the pictures.

This unit was purchased by a Federal University and has ALWAYS been VERY WELL TAKEN CARE OF, that is why it is complete as can be seen in the pictures!!!

We have no way of testing it except for powering it up and seeing that it does light up and nothing seems to be missing inside so we are selling it under an as is no return condition, that is why also the low asking price.

Please check all the inside pictures we took also, we took the cover up so buyers can see inside.

FEEL FREE TO CHECK TECHNICAL REVIEWS AND DATA SPECS ON THIS VSO LABS AMPLIFIER BY GOOGLING THE FOLLOWING LINK: hifi-classic.net/review/vsp-labs-trans-mos-372.html

Specifications

Power output: 150 watts per channel into 8Ω (stereo), 300W into 8Ω (mono)

Frequency response: 20Hz to 20kHz

Total harmonic distortion: 0.05%

Year: 1983

The name of VSP Labs' Trans MOS power amplifier contains key clues to its special features. Trans refers to its circuit topology (a transconductance amplifier), and MOS refers to its output devices (power A/OSFET's). It is rated to deliver 150 watts per channel into 8-ohm loads from 20 to 20,000 Hz with no more than 0.05 per cent total harmonic distortion.

A "transconductance amplifier" is merely one in which an input voltage signal is converted to an output current signal. This is the basis for the operation of all vacuum-tube amplifiers, and MOSFET's (metal-oxide-semiconductor field-effect transistors) have similar operating characteristics. Ordinary bipolar transistors, on the other hand, amplify an input current to a larger output current. In an ideal world, there probably would be little difference between the two types of amplification, since all dynamic loudspeakers must be driven by both a current and a voltage (in other words, they are neither infinite- nor zero-impedance devices). But all transistors have inherent nonlinearities and response-time limitations that usually require the use of considerable amounts of negative feedback to achieve the low distortion values attained by today's amplifiers.

In recent years, much has been said and written about the transient distortions that can occur when very large amounts of overall negative feedback (from output to input) are used in a power amplifier having a limited open-loop bandwidth. One way to reduce these effects is to use nested feedback loops, with lesser amounts of feedback being applied around individual stages of the amplifier, and a smaller than usual amount of overall feedback around the whole amplifier. Properly executed, such a design can provide the low distortion of a high-feed-back amplifier along with the transient stability of a low-feedback amplifier.

In the VSP Trans MOS, the MOSFET output devices provide a tube-like amplifying characteristic (believed by some to produce a sound quality superior to that of a transistor amplifier) while retaining the other advantages of solid-state design (small size, low heat dissipation, long life, etc.). In addition, the amplifier uses nested feedback loops for minimum high-frequency distortion and high stability. The self-limiting characteristic of power MOSFET's eliminates any need for the usual current-limiting protective circuits, which have been known to have undesirable side effects. The VSP Trans MOS is fully protected, however, by high-temperature sensors that guard against excessive operating temperatures by reducing the signal level and flashing an over temp warning light.

The Trans MOS is a compact but rather heavy amplifier. 

It measures 14 inches wide 13-1/2 inches deep, and 5 inches high, but much of the width is accounted for by the massive heat sinks on both sides. Perhaps because of its visual compactness, the amplifier feels even heavier than its 40 pounds. On the front are a rocker-type power switch, a green pilot light, the red over temp light, and two amber clipping lights. The rear of the amplifier contains heavy-duty five-way binding-post speaker terminals, the phono-jack inputs, two slide switches, and the line-fuse holder. One of the slide switches selects mono or stereo operation (in mono, the Trans MOS becomes a 300-watt amplifier for a 16-ohm load), and the other connects an active infrasonic filter (rolling off at 18 dB per octave below 20 Hz) into the otherwise fully direct-coupled signal path. 

The suggested retail price of the VSP Trans MOS power amplifier is $975. It is also available in kit form for $850.

GUARANTEED WORKING OR YOUR MONEY BACK!!!

Feel free to contact us if you have any questions, we will respond PROMPTLY!

Stock: 20202