The AM Forum

THE AM BULLETIN BOARD => Technical Forum => Topic started by: WA4WAX on September 25, 2015, 07:06:51 PM

Title: High Stability Tube VFO
Post by: WA4WAX on September 25, 2015, 07:06:51 PM

A 12AT7 and a 12AU7! Just the thing for that AM transmitter. Someone please check his drift claims. Looks like a nice unit.

One might use an aluminum box lined with stryofoam insulation.

http://americanradiohistory.com/Archive-Electronics-World/60s/1961/Electronics-World-1961-07.pdf

Matt

Title: Re: High Stability Tube VFO
Post by: KO6YB on September 25, 2015, 10:18:39 PM

Hello WA4WAX, looks a lot like the Vackar tube VFO. Worth reading if you are building this VFO.

http://www.w7ekb.com/glowbugs/VFOs/vackar_vfo.html

Stan

Title: Re: High Stability Tube VFO
Post by: WA4WAX on October 01, 2015, 10:54:56 AM

Thanks Stan!

I am familiar with that 12AT7 circuit, and was planning to post it.

I have quite hoard of old articles, and post from time to time.

Matt

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