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RE: The heat of a headphone OTL amp....

The Bottlehead Crack w/ the Speedball upgrade comes in at $391. As stated it deals with high impedance headphones beautifully. Mine is mated with Sennheiser 650 phones and I couldn't be happier. The heat of the big WE 6080 dual triode output tube is negligible. The 12AU7 is barely worth noting. After a few hours the power transformer will get mildly warm to the touch.

The heat noted as a general question may be worth a small stab... With enough tube amps running during a summer's night one may be tempted to kick on the AC and that will effect the sound! :)


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