Technics by Panasonic Peak/Average Meter Unit SH-9020 IMMACULATE Condition - 1st Owner

Technics by Panasonic Peak/Average Meter Unit SH-9020

I am 1st Owner. This unit has very low hours. Was on the storage
for more than 25 years. Like New. Immaculate.
Comes with: OEM Box, packaging and manual.
This unit has very very low hours of
use with 25 years on the storage and never was hacked. No marks, no
scratches, no fading top paint, no rusty, like a 100% brand new one.
The
Technics SH-9020 seems like a goof, but it's actually a very accurate
and precise wide-ranged meter that's very useful for measuring audio
levels.
One thing it does is hold peaks forever. You can leave it
running, and come back later and see the exact peak power used by your
amplifier. It's so sensitive to even the shortest peak that I didn't
realize I used so much power.
It's a masterpiece of analog design. It's accurate, fast and stable.
There's no overshoot; the needle moves up to the peak and stays there.
The
Peak Hold setting works! You can set it, play the amp, and look or come
back later and see what the peak power was. There's no auto reset for
Peak Hold, it holds the peak and stays at that level for hours
Circuit Design
It uses a full-wave rectifier.
It either has an instantaneous peak attack, or a 200 mS attack in average mode.
Decay is either roughly VU, or infinite.
The front panel selects either of two loop-through line-level RCA inputs, or the back-panel speaker level (power) inputs.
Watts are measured as voltage, then displayed as power into your choice of 8Ω, 6Ω or 4Ω.
The +20 dB range switch is on front, and the 8Ω, 6Ω or 4Ω selection switch is on the back.
The
SH-9020 is calibrated in dBu (0 dBu = 774.6 mV) for line levels, but
it's not marked that way. A standard CD player or DAC has a 2 V maximum
output, and will read +8.2 dBu peak.
Peak and Average levels are
calibrated for the RMS value of a sine wave; in other words, a sine wave
will read the same in either the Peak or Average settings.