In Reply to: RE: Filament bias posted by vetmedrobert@gmail.com on August 5, 2017 at 16:53:55:
Hi!
The 'old' data sheets are accurate. The curves usually refer to the midpoint of the filament and are taken with AC filament. If you apply DC filament voltage and raise it with a filament bias resistor to 5V, your actual bias is more like - 8.75V.
Anyways there are tolerances between tubes so not every tube sample will bias down to the same exact mA value at the same op point
BR
Thomas
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Follow Ups
- RE: Filament bias - Thomas Mayer 04:54:42 08/06/17 (6)
- RE: Filament bias - vetmedrobert@gmail.com 07:10:01 08/06/17 (5)
- RE: Filament bias - Caucasian Blackplate 09:38:39 08/06/17 (4)
- RE: Filament bias - vetmedrobert@gmail.com 09:55:30 08/06/17 (3)
- RE: Filament bias - Caucasian Blackplate 10:04:34 08/06/17 (2)
- RE: Filament bias - vetmedrobert@gmail.com 16:12:15 08/06/17 (1)
- RE: Filament bias - Thomas Mayer 23:55:26 08/06/17 (0)