[ARC5] BC-454-B Power

[Kenneth G. Gordon]

On 19 Jul 2021 at 15:58, Brian Clarke wrote:

>     Not such a good idea, Ken.

I was responding to the comment about the radio being converted to parallel filaments, and 
using 6 volt tubes, Brian

>     This idea of substituting 6 V tubes really only works if all the heaters are in parallel. 
>     6SK7, 6K8, 6SR7 all require 6.3 V @ 0.3 A. The 6V6 heater requires 0.45 A.

Yes. I know that.

>     Further, the 6V6 is not a good match for anode load; a far better match, and available in 
>     metal with the same pin-outs as the 12A6 and 6V6, is the 6F6, anode load 7 k Ohm , but 
>     heater current 0.7 A.

I know that too, Brian, but the 6F6 is a much taller and fatter tube and won't fit in the radio 
with the covers on.

In any case, as far as I am concerned, converting the radio to use either 6 V tubes, or to 
change to all parallel filaments are really stupid ideas.

Ken W7EKB