Hi. I have for sale Lomo high gain preamps from master type recorders.
It is fully discrete except 1 IC in vu meter circuitry.
Needs 33 vdc to run.
Playback amplifier 71U-15 is designed to amplify and
correction of audio signals coming from the magnetic
playback head with an inductance of 60 to 90 mH
TECHNICAL DATA
The gain at a frequency of 400 Hz, dB:
maximum, at least 72
minimum, not more than 52
The input voltage at a frequency of 400 Hz, mV:
Rated 1.55
maximum, at least 17
The output voltage in the range of frequencies from 21.5 to 16,000Hz,
Rated 1.55
maximum, at least 5
Load resistance, Ohm, not less than 600
Distortion in the range
frequencies from 31.5 to 16,000 Hz at maximum gain,
maximum level of output voltage and rated
correction,%, not more than 0.5
Noise level, measured relative to the nominal output
voltage gain 66 dB and a nominal correction, dB,
not more than minus 62
The noise level, measured along the curve "A" dB
not more than minus 72
Voltage, in 33 +/- 0.75
Modules in good working condition. With some modification it can become microphone preamps.
Have no schematics. 71U-15 is Y1 in wiring diagram (Pic 5).
Input transformer Pic 4 (second from bottom)
400$ per pair + shipping.
PM me.
It is fully discrete except 1 IC in vu meter circuitry.
Needs 33 vdc to run.
Playback amplifier 71U-15 is designed to amplify and
correction of audio signals coming from the magnetic
playback head with an inductance of 60 to 90 mH
TECHNICAL DATA
The gain at a frequency of 400 Hz, dB:
maximum, at least 72
minimum, not more than 52
The input voltage at a frequency of 400 Hz, mV:
Rated 1.55
maximum, at least 17
The output voltage in the range of frequencies from 21.5 to 16,000Hz,
Rated 1.55
maximum, at least 5
Load resistance, Ohm, not less than 600
Distortion in the range
frequencies from 31.5 to 16,000 Hz at maximum gain,
maximum level of output voltage and rated
correction,%, not more than 0.5
Noise level, measured relative to the nominal output
voltage gain 66 dB and a nominal correction, dB,
not more than minus 62
The noise level, measured along the curve "A" dB
not more than minus 72
Voltage, in 33 +/- 0.75
Modules in good working condition. With some modification it can become microphone preamps.
Have no schematics. 71U-15 is Y1 in wiring diagram (Pic 5).
Input transformer Pic 4 (second from bottom)
400$ per pair + shipping.
PM me.
