SB 301 LMO tubes

[Ed Swynar]

Hi Glenn,

Even swapping a VFO tube with a similarly marked one is NO guarantee that
dial calibration will remain the same anyway, as I'm sure you already
know...

One day I swapped a whole whack of LMO tubes in an SB-300 that I
had---incredible the differences in inter-electrode capacitances, as was
evident in how dial calibration changed from tube to tube!

~73~ Eddy VE3CUI - VE3XZ




----- Original Message -----
From: "Glen Zook" <gzook at YAHOO.COM>
To: <HEATH at LISTSERV.TEMPE.GOV>
Sent: Saturday, October 09, 2004 7:26 PM
Subject: Re: SB 301 LMO tubes


> You do NOT want to replace the tube "just to retain
> calibration"!  They have different heater currents and
> that will upset the balance in the series / parallel
> arrangement that the unit uses.  If you put in the
> wrong tube one tube will develope considerably more
> voltage across it while the other one that is in
> series will develope less voltage which will greatly
> affect the performance of the tube.
>
> Glen, K9STH
>
>
> --- Stu Lyon <w6cux at EARTHLINK.NET> wrote:
>
> I would replace whatever is in there with the same
> type to maintain the calibration.
>
> =====
> Glen, K9STH
>
> Web sites
>
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> http://home.comcast.net/~zcomco
>
>
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