>
>re: SB -220 "restoration"
>-
>> From: Rich... <2@mail.vcnet.com>
>Ä A "complete restoration" means removing:
>-
>A poor initial choice of words, maybe repair as needed,
? As needed is not in the restoration-purest's vocabulary.
>refurbish and upgrade with "current amplifier technology,"
>an often hotly debated topic on amps.
>-
? The evidence is not easy to toss off (not in the British sense).
>> 1. the step-start mod... [snip]
>I do like a step start and have them in many amplifiers, I've
>not experienced power switch failures in SB-220's and
>I have many and have worked on many. I was not
>aware that it was a significant problem for the switch.
? If the SB-220 is powered from a stiff 240V source, it's hard on the
contacts -- but not as hard as if a TL-922 is powered from a stiff
source.
>I like the step start to ease the filter bank back to normal
>operating potentials.
>-
? The electrolytics' inrush current is not a problem. The E-I core
transformer automatically limits secondary current.
>> 2. lower VHF -Q suppressors... [snip]
>I'm using a modified version of your basic design. Never
>had an amplifier "go poof" with your or my suppressors
>on board.
>-
? I have. Not enough L-supp will do it. Glitch protection is not a bad
idea. In hard cases, an exorcism may be unavoidable.
>3. the high speed switching mod... [snip]
>I most often use a different approach to keep the
>original relays in operation and not hot switch.
>Various options are possible...
? The original relay is too noisy for me. How do you keep it from
hotswitching with a FT-1000D?
>-
>4. the glitch protection... [snip]
>Should be added to any stock amplifier and left in
>place. I would not remove any of said properly done.
>I have found well intended mods which were so
>poorly done, I've had to replace them, but glitch and
>failure protection are a must have.
>
? 200A-peak diodes on the meters save money in the long run.
laer, Skipp
>
>
>
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- R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K,
www.vcnet.com/measures.
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