[Hammarlund] Home brew Hammarlund type dial drive

[Robert Moses]

Home made tubes! What a fascinating idea.

On 11/04/2014 05:14 PM, Brian Burns wrote:
> Hello Mike,
>
>  
>
> ~ I like your moxie Brian and making IF's isn't out of the question.  
>
> Well, I've certainly considered it. If I can't find some low frequency IF's,
> I may resort to that. IF transformers are the most difficult things to
> source for building an HBR.
>
> ~ Making tubes is another matter...or maybe it isn't:
> http://youtu.be/gl-QMuUQhVM  Hope you haven't already seen that one.
>
> I hadn't seen that one. That old spot welder is really neat! I went to high
> school in Redwood City, CA, and a roommate of mine got a job at Eimac
> running a glassblowing lathe. I never got a plant tour though.
>
> Meantime, have you considered driving your tuning with dial cord rather than
> friction?  Strikes me as a possibly simpler approach for an HBR.  Just a
> thought.
>
> I'm just in the design stage, so I'm open to all suggestions. The Hammarlund
> style friction drive looks to be fairly straight forward, but I may want to
> gear down further than it allows.
>
> Cheers,
>
> Brian
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