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MP66

Measurements

 

Typical values measured with an HP8903A Audio Analyser and a Fluke 187 multimeter.

Configuration :

- Lundhall LL1538 input transformer, 1:5 ratio
- Cinemag CMOQ-2S output transformer, 2:1 ratio
- Board supply ±27V

 
Measurement Conditions Value
Iddle supply current No input signal

V+ : +145mA
V- : -190mA

Input impedance

1.2kΩ
Maximum input level Input pad Off
f=1kHz		 limited by input TX:
> +10dBu
Input pad On
f=1kHz		 limited by input TX:
> +30dBu
Maximum output level before clip f=1kHz

+26dBu@1% disto
+28dBu@3% disto

Minimum gain  

-∞
Maximum gain Gain switch=Low +13dB
Gain switch=Mid +32dB
Gain switch=High +62dB
EIN Zin=150Ω
Bandwidth=0-30kHz		 -124dBu
Zin=0Ω
Bandwidth=0-30kHz		 -125dBu
Frequency response Gain=+45dB
Zin=150Ω
Deviation=-1dB		 10Hz-37kHz
Air Eq Position Air+ +3.3dB @ 12KHz
Position Air- -3.3dB @ 12KHz
High pass filter Position 50Hz -11dB @ 20Hz
-5dB @ 50Hz
-1.6dB@100Hz
Position 100Hz -16dB @ 20Hz
-9dB @ 50Hz
-4dB @ 100Hz
THD f=1kHz
Gain switch on High
Gain Pot on"6"
Gain=+45dB

< 0.03% @ Vout=+12dB
< 0.1% @ Vout=+18dB
< 0.5% @ Vout=+24dB
< 1% @ Vout=+26dB

CMRR f=100Hz -125dB
f=10kHz -93dB

 

Square wave response

Signal injected into input XLR, scope on output XLR, going through both transformers.

 

Square wave low gain 1K
Square wave high gain 1K
square wave high gain 10K
Square wave output
f = 1kHz
gain = mid (+32dB)
scale = 5V/div
Square wave output
f = 1kHz
gain = +62dB
scale = 5V/div
Square wave output
f = 10kHz
gain = +62dB
scale = 5V/div