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
Hello,
I have been looking at the HIFI Amplifiers that you have posted on your Brain Dump page and would like to know how to translate the Transformer Wire size to english. Could you help me? I will appreciate it or any link that would allow me to enter these values and translate them
Example: wire thickness ПЭЛ 0.14 and core Ш20.
I have searched for a way to translate these to no avail.
Thank you,
Regards,
Bill
Ш20 means, that transformer’s metal core is in the form of “E” (just rotate to get “Ш”) and number “20” is width of the central part (where winding is). There is missing another parameter- thickness of the transformer (толщина пакета).
About the wire: ПЭЛ 0.14 – the diameter of copper wire is 0.14mm, characters ПЭЛ means “Провод с Эмалевым Лакостойким покрытием масляно-смоляные эмаль, лаки на основе полимеризованных растительных масел” just the type of wire varnish. Any decent copper wire will be better that old russian ПЭЛ.