UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - TO-5 chassis mount heatsink?

G6Tanuki · 18th Jun 2015, 4:17 pm

I don't think the ones you show would have good-enough thermal contact for my particular application. Looking at them, the amount of metal between the mounting-screw and the crimped bit the transistor pushes into looks sufficiently small that the transistor would probably track the forced-air-cooling temperature not the heatsink temperature.

The ones I used in the past came with the transistors already fitted to the blocks - and if there was an issue we replaced the block-and-transistor as one. Could well have been specially made (for a cost-plus contract you don't fret about small-batch costs).

18th Jun 2015, 4:17 pm	#3
G6Tanuki Dekatron Join Date: Apr 2012 Location: Wiltshire, UK. Posts: 13,998	Re: TO-5 chassis mount heatsink? I don't think the ones you show would have good-enough thermal contact for my particular application. Looking at them, the amount of metal between the mounting-screw and the crimped bit the transistor pushes into looks sufficiently small that the transistor would probably track the forced-air-cooling temperature not the heatsink temperature. The ones I used in the past came with the transistors already fitted to the blocks - and if there was an issue we replaced the block-and-transistor as one. Could well have been specially made (for a cost-plus contract you don't fret about small-batch costs).