[HBR] Need help: extending the "preselector input tuning range" of the 1953 ARRL 4 tube superhet

[WA5VGO]

It's close, but it appears it will make it as is. You'll need about 15.7 
uH of inductance.

Darrell


On 3/7/2010 10:30 AM, C Eus wrote:
> All:
> I hope this is not too far off topic but I am in the process of gathering
> the parts for the 1953 ARRL Handbook 4 tube rx.
>
> The current input tuning capability as designed is ranged from 3.5-8 Mcs. I
> would like to extend the range to include 10.2 Mcs for WWV and 30 meter CW.
>   Removing or changing the padding capacitor should be easy on the VFO.
>
> However, I do not know if the dual Hammarlund 140 pf can be changed to cover
> the   tuning range to extend to the 30 meter band.  I was thinking about
> change the duals to 100 pf per section and adding a switch to pad for lower
> freqs.  Any suggestions? Has anyone encountered this problem before? Thanks.
> Cal.
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