In older post I wrote about unified soviet tube audio amplifier. This is from “high class” device. Today, I found the schematics of “highest class”, the HiFi audio device: AM/FM radio, record player. The output is 6W of pure tube power with lowest distortion. This device was manufactured in 1964 and schematics published in popular radio magazine in 1965. With some our days modifications it is possible to build quite cool power amp with quite popular tubes.
The circuit diagram of audio amp for printing
The circuit diagram of power supply for printing
Number
Winding count
Wire thickness
Core
TR1, TR2
3-4
1000
ПЭЛ 0.14
Ш20
4-5
300
ПЭЛ 0.14
5-6
300
ПЭЛ 0.14
6-7
1000
ПЭЛ 0.14
9-1
82
ПЭЛ 0.69
TR1 POWER (PSU UNIT)
1a-3a
0-458-530
ПЭЛ 0.64
TC-135
1b-3b
0-458-530
ПЭЛ 0.64
5a-5b
505x2
ПЭЛ 0.41
7a-7b
29x2
ПЭЛ 1.20
9a-10a
14
ПЭЛ 0.90
9b-10b
14
ПЭЛ 0.90
11a-14a
0-30-60-100
ПЭЛ 0.31
DR1
н-о-к
0-2890-2950
ПЭЛ 0.16
Ш16x16, >3.5H
Tube data:
Л1, Л2, Л3: 6Ð2П, ECC83, 12AX7 (but with heater modification)
Л4, Л5, Л6, Л7: 6П14П, EL84, 6BQ5, 7189A
