[AMRadio] RE: the weekly receiver update

[Brett Gazdzinski]

Don,
Since my home brew receiver is partly based on my Scott
receiver, it runs a fairly low voltage.
The Scott runs about 100 volts, the home brew runs 105
(regulated).
I tried various voltages using my heathkit variable
supply, and found very little difference down to as low as
about 35 volts, without circuit changes.
This is with octal type tubes.

I wonder why they used voltages as high as 250 or 300
in some gear, as it seems to have little benefit.
I ran the voltage up also, and there was no improvement
in performance...


Brett
N2DTS

 
> 
> I  recall from studying the tube manuals that the 28 volt 
> tubes in the R-392 
> are identical to standard tubes except for  the filament 
> voltage.  The tubes 
> perform well at 28 volts on the plate due to  circuit 
> component values,  but 
> standard 6 and 12 volt filament tubes would work identically.  Never 
> actually experimented to see if there was any difference.
> 
> Don K4KYV
> 
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