[Hallicrafters] SX-73 VS: SP-600-JX Tuning comparison

[Charlie T, K3ICH]

Agreed.  On the first SX-73 I restored, the tuning knob was actually frozen. 
I never expected it to eventually be as smooth as it came out.  Impressive 
to say the least; as nice a band scanner as any SP-600.  One trick I've used 
on the slipping SP-600's is to clean off the grooved drive wheel as well as 
the edge of the big disk with lacquer thinner on a "Q-Tip" to remove any 
hint of lubrication.

73' Charlie k3ICH


----- Original Message ----- 
From: <kirklandb at sympatico.ca>
To: <1oldlens1 at ix.netcom.com>
Cc: <hallicrafters at mailman.qth.net>
Sent: Thursday, November 04, 2010 9:41 AM
Subject: Re: [Hallicrafters] SX-73 VS: SP-600-JX Tuning comparison


>
> The sp-600 uses a friction drive which is a grooved disk that engages the 
> rim of the tuning dial.
> There is a spring on the grooved disk and if that spring looses tension, 
> tuning can slip.
>
> The Sx-73 is geared. I liked the sx-73 tuning feel a bit better, but it is 
> more work to re-condition.
> With gears it is possible to break them by forcing this. On a sp-600 the 
> drive will just slide if something is stuck.
>
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