[Milsurplus] 6AQ5 Tank

[jmfranke]

If you decrease the frequency by a factor of ~6, you must increase the 
capacitance by the same factor to have the same reactance, so the tank 
capacitor should be increased by (24/3.9) (40 pF) = 246 pF.

John  WA4WDL

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From: "David Stinson" <arc5 at ix.netcom.com>
Sent: Wednesday, July 20, 2011 6:50 PM
To: <milsurplus at mailman.qth.net>; "ARC-5 List" <arc5 at mailman.qth.net>
Subject: [Milsurplus] 6AQ5 Tank

> Ok all you smart people-
> I'm looking at a 6AQ5 Pierce crystal oscillator/tripler
> with a plate tank circuit which outputs at 24 MC.
> The plate tank capacitor is 40 pFd.
> The capacitive reactance at 24 MC is only 166 ohms.
> This seems low for a tube tank.  Output capac.
> of 6AQ5  is 6 pFd,  so that doesn't change the picture much.
> I was looking at changing the tank to output at 3.9 MC,
> but if Xc = 166 ohms is correct, the tank cap
> at 3.9 MC would be 6.7 uFd.  That can't be right.
> What's up with this?
>
>
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