• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

about input transformer

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day

Member
Joined 2004
I have some input transformer like UTC a10 a12 15095.
I want to build SE-GM70 .
Can it drive tube like 6AU5,6L6,12SX7,EL34 to drive GM70?
Where cani fine the circuit?
Thank you
DAY
 

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PRR

PRR

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Joined 2003
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> input transformer like UTC a10 a12 15095. Can it drive tube like 6AU5,6L6,12SX7,EL34 to drive GM70?

Find the specs for the transformers and tubes.

I happen to know the A-10 a little. If I remember correctly, it is 600:15K and rated 0dBm. 0dBm is 0.775 Volts in 600 ohms. 600:15K is a 1:4 ratio. So the rated secondary voltage is 3.1V RMS, 4.4V peak.

I don't know the GM70 very well, but few power tubes can be driven with 4V peak.

Most of these transformers look like "input transformers". They were made to drive small tubes, not large tubes.
 
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