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Re: [TCML] 833A VTTC schematics



On 11/10/11 1:52 AM, Michael Mayer wrote:
Dear William,


2. tube plate heats up red hot immediately after applying power, and the glass envelope definitely needs a cooling fan

These tubes cool primarily by radiation, not conduction. While you do want cooling air to keep the glass below melting point (particularly around the pins), that's not an effective way to cool them. Some heat is carried out through the pins as well.

Don't forget there is a vacuum inside, so the thermal transport is by radiation initially. Some is absorbed by the glass envelope, but hopefully a small amount. You need something cool and black next to the envelope to absorb the radiant heat and carry it away. the worst thing is a shiny metal chimney, which just reflects the heat back to the plate.



3. to combat the red hot plate problem, I am in the process of building Steve's Staccato circuit which will then be added to the 833A filament via triac.

that's definitely a decent approach.. increase peak power while keeping average power lower. Thermal effects are tied to average power, spark length to peak.
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