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3 to 10 minutes (sometimes as much as 30) seems to be in the ballpark for the grid structure to heat up. Remember we are in a vacuum here, so there is NO convection, little conduction, because the cathode is mounted on an insulator, so the grid cup is heated mostly by thermal radiation from the hot cathode (about 750 degrees C). If it is grid emission from G1, then lowering the G2s (R,G,B screen controls) should decrease the "background" that you observe when the set is warm.
jr
Are the heaters of all the small tubes in the set also running at 5.95 vrms? could cause a warm-up time problem?
Last edited by jr_tech; 10-06-2009 at 02:35 PM.
Reason: add info
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10-06-2009, 02:30 PM
Hybrid Mode
