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Old 14th August 2005, 03:28 PM   #1
day is offline day  Thailand
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Default about input transformer

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
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Old 14th August 2005, 11:24 PM   #2
PRR is offline PRR  United States
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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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Old 15th August 2005, 12:45 AM   #3
day is offline day  Thailand
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thank PRR
I want it to drive 6AU5,6L6,12SX7,EL34 and form this tube go to
this circuit drive 845 but i do not want 2 gm70 just 1 and 1 drive tube.
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