[ARC5] 6K6 vs 12A6 - filament balancing resistor
Ian Wilson
ianmwilson73 at gmail.com
Tue Apr 7 13:29:18 EDT 2015
Not sure I grok this, Ken.
The 6K6/6V6 is in series with a 6SR7 (replacing a 12SR7).
The 6SR7 draws 0.3A with 6.3V.
So, for a 6K6 you would add a 63 ohm resistor in parallel
with the 6SR7 heater; for a 6V6 this would be 42 ohm.
In both cases, less than 1W would be dissipated in the
resistor, so a 2-5W resistor would be OK.
73, ian K3IMW
On Tue, Apr 7, 2015 at 10:05 AM, Kenneth G. Gordon <kgordon2006 at frontier.com
> wrote:
> According to my quick and dirty calculations, one would need to add a 5.25
> ohm, 5 watt resistor in series with the "other" tube's filaments in order
> to
> achieve correct balance if using the 6K6 in place of the 12A6.
>
> If you wanted to use a 6V6, then you would need a 7 ohm, 5 watter.
>
> Ken W7EKB
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