Vermes
Advanced Member level 4
It is a tube guitar amplifier of own construction. Preamplifier was inspired by Soldano Atomic on two duotriodes 6N2P. Power amplifier was based on pentode EL84. Transformers: TS40/14/676 and TG2,5/1/666.
Firstly, a prototype of chassis was made of cardboard.
Then it was made of 2mm aluminum oxidized sheet. It was cut and bent according to the assumptions. Then holes were drilled. When the chassis was ready, it was time to assembly the transformers, switches, potentiometers, tube stands. Then glow circuit of the tubes were made (preamplifier tubes glow with a constant voltage symmetrized to the ground using two resistors 150R, final tube glows with symmetrized alternating voltage.
After making the connections, plugging in the speaker and power supply, the device was run.
Hum level is very low – it is hard to hear even with the ear close to the speaker.
The housing was made of solid spruce wood with a thickness of 18mm. It is glued and screwed together with screws. It is also covered with a beige artificial leather. In the end, corners, legs and handle were screwed.
Link to original thread (videos) - Wzmacniacz gitarowy Atom 5W SE by Pepi
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