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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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I want to do grid bias with a 9V or 12V battery (negative pole to grid, positive pole to ground). According to my reading of these Archives, if this is done with NiMh cells, the batteries will be continuously charged due to the small amount of grid current. If I am correct, does this mean the batteries will last indefinitely? How often will I need to check voltage? (I know this will depend on the exact specs of the batteries and on the amount of grid current that actually passes, but a ballpark figure would do, or a way to calculate expected lifespan would be better.) OTOH, am I just as well off or better off to use lithium cells and just count on changing them every year or so? Thanks for any comments.
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Topic - grid bias with batteries - Lew 09:19:04 12/08/06 (15)
- I've used small 12V alkaline batters to good effect. - -3db 18:14:27 12/10/06 (0)
- Re: grid bias with batteries - Naz 15:23:36 12/10/06 (1)
- Thanks, Naz - Lew 11:40:00 12/11/06 (0)
- No answers, just more questions - lipmanl 11:32:05 12/08/06 (1)
- Re: No answers, just more questions - Lew 12:38:29 12/08/06 (0)
- Re: grid bias with batteries - Eli Duttman 10:24:49 12/08/06 (2)
- Gotcha! - Lew 12:32:18 12/08/06 (1)
- Re: Gotcha! - dave slagle 15:02:53 12/08/06 (0)
- Re: grid bias with batteries - 01A 10:13:30 12/08/06 (0)
- addendum - Lew 09:21:32 12/08/06 (5)
- I'd say no ... - gluca 11:56:41 12/08/06 (4)
- That is interesting. - 01A 13:36:25 12/08/06 (2)
- Re: That is interesting. - Lew 23:14:27 12/08/06 (1)
- Re: That is interesting. - 01A 10:42:31 12/09/06 (0)
- Re: I'd say no ... - Lew 12:34:38 12/08/06 (0)
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