Linear heat sink/cooler for Russian tubes.  Drilled 10mm off center for Kenwood TL-922 and Heathkit SB-220 (with fan mod) linear amplifiers fit.

Heat sink/cooler only for sale - no tube included.

Simpler and less expensive design.  No expensive cooler for GI-46b tubes needed.  No extra fans or chimneys.  Design not tested.

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