gres
Full Member level 4
Target was to make very small amplifier, that allow to listen at normal sound level.
Device has a 12AX7 (ECC83) lamp at preamplifier, and EL95 ( one per each channel)
Speakers transformers are popular TG2-31 that for 8 Ohm speakers can give Ra about 10kom that is perfect for that lamp. Power supply is on the ground of toroidal transformer 30W and voltages 200V and 6,3V what gives about 250V DC. Power supply filter is in the row 47uF, 1kom, 47uF, 47kom, 100uF.
Measured power of amplifier is about 1,6W/channel ( enough for normal listening), strand is 35-19000Hz. Amplifier work very precocious, with surround and without distortions or buzzing
Small casing is a problem for clear instalment, but for me everything is clear and there will be no problems to repair
To build we need: lamps, casings, transformers, potentiometers, resistors, condensers, slots, switchers, bananas for back, basics.
Original projet is here : https://www.elektroda.pl/rtvforum/topic1429142.html