[ARC5] 6AC7 and 6AB7

[Geoff]

Even the 860 with 1000V was a very stable VFO but generally using a power 
tube is not a good idea unless it is really loafing.

Carl


----- Original Message ----- 
From: "Kenneth G. Gordon" <kgordon2006 at frontier.com>
To: "ARC-5 List" <arc5 at mailman.qth.net>
Sent: Friday, February 08, 2013 1:02 PM
Subject: Re: [ARC5] 6AC7 and 6AB7


> On 8 Feb 2013 at 4:33, Mike Everette wrote:
>
>> Not sure if I recall any articles about the 6AC7 in a VFO.  Are you
>> possibly confusing it with the 6AG7?  That was a very popular
>> oscillator tube and worked great in a VFO.  I built a couple with
>> 6AG7s, so can testify to it.
>
> Yes, the 6AG7 is a very excellent oscillator tube, and was used in many,
> many oscillators, both crystal and VFO.
>
> But, yes, I have in my collection of old ARRL handbooks several articles
> detailing VFOs built with the 6AC7, and also with the 6SK7, as Carl
> mentions.
>
> The 802 was also popular and the 837 was used by the Navy as a very good
> VFO tube.
>
> Ken W7EKB
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