It would be rather simple to install a AC line cover interlock with a
microswitch as other brands have done for decades.
However since its a chore to remove the cabinet and cover for servicing
AND the cover often needs to be off when checking and testing I always
bend the shorting strap down. Or use a clip lead jumper on other amps.
If you are overfully forgetful then place a big label on the cover
reminding you to pull the AC cord before sticking fingers in amp.
Carl
KM1H
----- Original Message -----
From: "Pete Smith" <n4zr@contesting.com>
To: <amps@contesting.com>
Sent: Friday, February 13, 2009 6:32 AM
Subject: Re: [Amps] SB-220 troubles
> At 01:17 AM 2/13/2009, someone wrote:
>>I'd be the first to admit I could make a mistake.
>>
>>However, I can't for the life of me picture how this particular
>>interlock
>>could save me.
>>
>>It seems to me that the psychology of this particular thing was to
>>save
>>someone who was cluelessly taking this amp apart *while it was powered
>>up* or
>>shortly afterward, before the bleeders drained the HV away.
>>
>>Every scenario I can think of that ends with me stupidly getting into
>>the HV
>>while working on this amp wouldn't be affected by this interlock.
>
> OK, here's an interesting design exercise - we need an interlock that
> *does* protect the operator and "doesn't* kill the power supply. How
> would
> you do it? Or can it be done?
>
> Otherwise, I'm inclined to remove the interlock on my SB-220.
>
> 73, Pete N4ZR
>
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