Posted by bcherry (D) on November 14, 2003 at 19:59:04

In Reply to: Different bias points? posted by JLH on November 14, 2003 at 09:18:30:

OK I ran curves on the highest and lowest prs. All stock falls somewhere within these extremes in the current shipment of premium globes:
highest: 55ma/-50V/250V
lowest: 43ma/-50V/250V

I'm running the 55ma ones in my own amps at this moment.

BTW, of the several thousand 2A3, 300B, 45, KT88, 6550 and EL34 power tubes curve traced from US/China/E. Europe countries, the average spread is about + or - 25%. Of course the higher gain tubes have more variation, lower gain, less.
Brian