[ARC5] Drift in BC-453 - more

[Bob kb8tq]

Hi

The point being that indeed people *did* regulate filament voltages along with B+ voltages on the oscillator
circuits in military radios. They simply didn’t do it on all radios. For that matter, they also didn’t seem to do
it on LM or BC-221 frequency meters either. As you point out, there are always multiple constraints on any
design,

Bob

> On Dec 13, 2017, at 9:01 PM, Brian Clarke <brianclarke01 at optusnet.com.au> wrote:
> 
> Different powering arrangement from Command sets. The R-390 family was designed for base station, racked operation powered from utility or base station mains, where regulation was whatever the installer could get away with under the contract.
>  
> 73 de Brian, VK2GCE
>  
> On Thursday, 14 December 2017 5:11 AM, Bob said:
>  
> Hi
>  
> The R-390A has regulated heaters if the “ballast tube” is still in there ….
>  
> Bob 

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