SB-301 Questions

[Stu Lyon]

John,

First off -- do you have the manual? Or just the alignment procedure? All
your questions are answered in the manual.

Anyway, you should be able to tune the LMO by just the shaft w/o the knob.
Take off the knob and you'll find a nut holding a shaft bushing in a slotted
hole. This slot adjusts the engagement of a pinch-drive to the dial. Loosen
the nut and move the bushing UP to slightly disengage the drive and tighten.
Try this. If you move it too far the shaft will just slip and maybe
disengage totally. It will take 3-4 tries but you should be able to get it
just right. Be sure to check over at least one full revolution of the dial.

The dial pointer is a little more tricky. If you look at the support points
of the dial pointer drive arm (to the chassis), you will find that it is
held in place by 6/32 screws in slotted holes. The arm has vertical slots
and the chassis has horizontal slots. The adjustment is up/down and
right/left in these slots. When the circular dial is fully CCW, the "90" on
the dial should align with the 2-1/2 mark on the plastic window. Then rotate
so that the first "00" is at 2-1/2. The white pointer should align with "0"
on the dial window. If not - if the pointer is to the RIGHT of "0", loosen
the screws and move the base of the arm RIGHT until the pointer is at "0".
If LEFT, do the opposite. Now rotate the dial five revolutions. The pointer
should align with the "5". If to the LEFT of "5", loosen the screws and move
the arm UP in the chassis slotted holes; if to the RIGHT of "5", move the
arm DOWN. After about 10 iterations of this, you'll come to a point of "gud
enuff". The pointer is not intended to be accurate -- just a turns counter.

Good luck
73, Stu W6CUX
Winnetka, CA
slyon at pacificnet.net




----- Original Message -----
From: "Gindlesberger John" <wa8fnj at YAHOO.COM>
To: <HEATH at LISTSERV.TEMPE.GOV>
Sent: Wednesday, February 20, 2002 12:21 PM
Subject: SB-301 Questions


> I just got an SB-301 which was in pretty rough shape.
> I cleaned it up and replaced two tubes and fired it
> up.  It works--not great--but I'll go throught the
> alignment procedure next.  I have a number of
> questions about it.  First, the main tuning seems
> rather tight to me.  How tight is it supposed to be?
> Should I be able to spin the knob with one finger? The
> upper dial pointer does not track accurately.  How do
> I adjust it?  Are there any "peculiarities" or quirks
> that I should know about with this receiver?
>
> Thanks for your help
> John
> WA8FNJ
>

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