>
>>
>>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
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