@PRR If you don't already know them, you should look up the articles about early ADCs, see https://www.diyaudio.com/community/threads/tube-dac-without-silicon.347864/#post-6039177 Digital TV is not as new as it seems.
Old mil spec and better amateur equipment often was equipped with IERC tube shields, which, afaik, are actually documented to reduce tube heat.
They just don't look fancy.
Win W5JAG
They just don't look fancy.
Win W5JAG
Better yet wrap copper tubing around your KT88’s and run water through it. That would look cool. And you can tell Sherrif Roscoe it’s your ‘still. Come to think of it, would ethyl alcohol actually be better than water as a coolant?
I made note of that part about 10 years ago in my 198 pg., "Tube Coolers and Equipment Reliability" literature you can download here: https://www.pearl-hifi.com/03_Prod_Serv/Coolers/PEARL_Tube_Coolers.pdf See page 29.
Yes, snake oil. They are a ridiculously poor copy of my 35 years running PEARL tube coolers.
To begin with, they're made of phosphor bronze which has about 10% the thermal conductivity of my solid copper coolers, they're a gauze construction that makes but a tiny amount of actual contact with the glass, they're supplied with a single O-ring that leaves the gauze loose on the glass where it can create micro-rattles that add to, rather than damp, externally induced microphonic outputs and they are retailed for FIVE TIMES the price of the PEARL tube coolers seen here https://www.pearl-hifi.com/03_Prod_Serv/Coolers/Coolers.html
Here's a page where the Kryna is offered for $US100.00 each https://www.thetubestore.com/parts-accessories/kryna-tube-radiators
I'm about to do a page where I give these counterfeits the thrashing they've earned by being such a p*ss poor rip off my designs.
If you'd like to see a proper implementation of power receiving tube cooling check out first pic of the power amp seen here: https://www.pearl-hifi.com/03_Prod_Serv/SC_180/SC_180.html
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