AUDIO SINE-SQUARE WAVE GENERATOR KIT
This is an inexpensive generator which covers 20 Hz-150 kHz with choice of sine or square waves-the latter to 50kHz.
Output voltages ranges:
Sine-wave 0-100mV, 0-1V, 0-10V. (Distortion less than 1%).
Square 0-800mV 0-8V, 0-80V.
Power requirements 110/200-250V AC 30W.
Marketed as an ideal instrument for checking the fidelity and distortion of audio amplifiers and radio receivers. Judging by the date codes on the capacitors this instrument was made in 1964. I understand from Glyn Jones who gave it to me that it had originally been used in a school.
Top and bottom of chassis
Originally the mains lead would have been
connected via a 3pin plug and socket. When received the socket had been
removed and a permanent connection had been made and the cable held in
place with two plastic cable ties threaded through the four holes. I
made a blanking plate for the large hole and fixed the mains cable with
a proper clamp.
An additional ECC82 valve and associated
components had been added to serve as a cathode follower. The
screened lead which would have been connected to the coax socket
on the front panel can be seen connected to the tag strip.
Back in 1964 you could purchase this oscillator as a kit of parts for £14.75 or factory assembled £21.25.
Daystrom was an American company which manufactured electronic equipment under the Heathkit brand name. They set up UK operations in 1959, Daystrom Ltd in a factory employing about 150 people to manufacture and market British versions of their equipment. The factory was in in Quedgley, Gloucester.