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In Reply to: RE: It's official the tube amps have been put away posted by airtime on June 17, 2017 at 12:35:26
I have a Van Alstine fet valve hybrid amp that also gets as hot as my tube amps. Have you ever considered bolting a fan to the top of your st70's cage to keep it cool during the summer? A really large 220v fan running at 120v seems to do the job and doesn't really make any noise.
We modify ST-70s using the 6SN7 tubesforhifi 6SN7 board. With the earlier power transformer the extra heater current draw causes the transformer to run hot. We use a wimpy but quiet little 12 volt fan run at 9 volts. You can't hear it from 3 feet away.
It took a transformer from to hot to leave your hand on (too hot!) to just warm (you could leave your hand on it comfortably all day) in 20 minutes.
Since transformers are just insulation, copper wire, and iron, as long as you cool them you can run them over spec without trouble.
Based on that and another experience, it is amazing how little air you have to move to make a major difference in temperature.
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