[AMPS] HL2200

[measures]

>
>>
>>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.  
>
€  To locate the bandswitch arcing info in this article, do a word search 
for "incinerate".  

cheers

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


--
FAQ on WWW:               http://www.contesting.com/FAQ/amps
Submissions:              amps@contesting.com
Administrative requests:  amps-REQUEST@contesting.com
Problems:                 owner-amps@contesting.com