This particular one had been completely overhauled and modified slightly to improve its audio response:
COMPARISON OF THE PROFESSIONAL MOVING MAGNET PREAMP MKII AND TWO OTHER PREAMPS
This is a short comparison of our Rek-O-Kut PMMP MKII and two very respected
and expensive phono preamps. We have been able to locate almost exactly
the same tests for all three.
So, we present them here. Frequency response is a basic measurement of
phono preamp quality. It takes great care of design and precision
component choice to achieve an accurate
phono response. Most phone preamps usually have phono frequency response
deviations in excess of +/-1.0 dB. The less the deviation, the better the
design and component parts.
The other test is for signal to noise ration The greater the
signal to noise ratio, the less background noise, such as hiss and hum, will be
apparent during quite passages of music
recorded on phonograph records.
MCINTOSH VINTAGE C20
Here is a graph of the audio frequency response of a classic McIntosh C-20
preamp, which often sells in excess of $2,000.00 in original condition. It, like the
following was measured through its phono inputs.
This particular one had been completely overhauled and modified slightly to
improve its audio response:
This one is quite good. It's audio response measures +/-0.4dB from 20 to 20 kHz. Notice the ripples in response.
Here is a measurement of it's signal to noise ratio through its phono inputs:
It measures quite well at 79 to 82 dB
MCINTOSH C35
Next we have a more recent McIntosh C35 preamp. It regularly sells for over $1000.00. Here is its frequency response.:
It has less wiggles than the C20, but the over-all deviation is within +/-0.45dB from 20 to 20 kHz.
Next, a look at the signal to noise ratio:
It also measures quite well at from 78 to 80 dB.
REK-O-KUT PROFESSIONAL MOVING MAGNET PREAMP MKII
Now let us examine the Rek-O-Kut PMMP MKII. It sells for $69.95. Here is its audio frequency response:
This time we see an audio frequency response of measures within +/-0.25dB from 20 to 20 kHz. That is excellent!
How about the Rek-O-Kut Professional Moving Magnet MKII Preamp's signal to noise ratio.
It measures quite well at 80 dB, virtually identical to the exotic and high priced preamps.