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[AMPS] HL2200

To: <amps@contesting.com>
Subject: [AMPS] HL2200
From: 2@vc.net (measures)
Date: Thu, 19 Apr 2001 05:15:25 -0700
>
>Amp folks,
>
>A friend is investigating an HL2200. I know this is the last iteration of 
>the venerable SB-220. Were there any significant differences, aside from 
>the obvious aesthetic changes?
>

Yes.  During late production of the SB-221, Heath increased the breakdown 
V of C-tune by using wider spacing.  My guess is that the subsequent 
HL-2200 uses the wider spaced capacitor.    The old Tune-C had a 
breakdown V lower than the breakdown V of the bandswitch.  Thus, when a 
tank arc took place, the C-tune arced first, thereby protecting the 
bandswitch.  With the wide spaced Tune-C, the frangible bandswitch arcs 
first.  The TL-922 has the same problem.   This problem can be easily 
fixed before the bandswitch is destroyed .  For details, see near the end 
of my Circuit Improvements for the TL-922 article on my Web site.  

cheers, Mark

-  Rich..., 805.386.3734, www.vcnet.com/measures.  
end


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