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I can use the tube amplifier from my grandpa as a heater :-) It is this brand: https://ms-vint-audio.de/kleinhummel-ks-57-restauration-eines-echten-klassikers/

• arprocter 3y ago
  I had similar results with a Classic 50 4x10 (3x 12AX7 and 4x EL84) The only amp I've owned that actually had a computer-sized fan inside to keep air flowing by the tubes