Altobass Stereo 70 preamplifier and Twin-Twelve power

Year of manufacture:

1958 - 1962

Manufactured by:

Altobass Ltd, Percy Road, Ayleston Park, Leicester (a division of Parmeko)

Price when new (in the UK):

stereo 70 control unit £24. 3s; Twin 12 amplifier £30. 9s

Description:

control unit and power amplifier

Mono/stereo:

stereo

TWIN-TWELVE POWER AMPLIFIER

Power output:

12 watts per channel

Harmonic distortion:

0·1% at rated power at 10 watts per channel

Frequency response:

20Hz - 20kHz ± 0.5dB

Input sensitivity:

150mV

Signal to noise ratio:

-78dB

Feedback:

20dB

Output impedance:

4, 8 and 16

Tubes:

4 x EL84 output

Dimensions:

14 in. x 7 in. x 6¾ in. (356 x 178 x 171 mm)

STEREO SEVENTY CONTROL AMPLIFIER

Harmonic distortion:

0.015%

Inputs/sensitivities:

auxiliary (100mV), microphone (95mV), pickup (4mV), radio (220mV) & tape (3mV)

Dimensions:

13½ in. x 7 in. x 3 in. (343 x 178 x 76 mm)