[Amps] SB-220 troubles

[Fern]

If not blowing the amplifier is more important to you rather than saving 
your life in case of a mistake, then I suppose that it's your choice.  Fern


----- Original Message ----- 
From: "Jeff Carter" <amps at hidden-valley.com>
To: <amps at contesting.com>
Sent: Thursday, February 12, 2009 7:21 PM
Subject: Re: [Amps] SB-220 troubles


> That's why I left the HV "protection" out of mine when I built it.
>
> I got called many, many bad names for doing that by the "Safety First"
> crowd.  However, I've always worked around HV, and I've worked on this
> SB-220 with the HV running.
>
> I still maintain that there's little to no actual benefit to that
> "protection" arrangement when seen in contrast with the damage that
> will most certainly occur when it is tripped.
>
> I can't see the situation under which a child young enough not to know
> better could get access to my house, then access the equipment, take
> the amp out of the case, and then take twelve screws out of the top
> screen with no tools, all while doing the heavy lifting (this amp
> probably weighs 50 pounds).
>
> Any adult who does this, in clear violation of my brand new and
> purchased just for this amplifier High Voltage sticker, deserves what
> he/she gets.  I'm not going to put all my hard work at risk just to
> protect some theoretical idiot.
>
> Jeff/KD4RBG
> http://www.kd4rbg.com
>
> ---- Original message ----
>>Date: Thu, 12 Feb 2009 15:11:24 -0500
>>From: "Carl" <km1h at jeremy.mv.com>
>>Subject: Re: [Amps] SB-220 troubles
>>First time I did that it took out the zener, several diodes, and the .82
>>Ohm resistor by the time a breaker popped. Luckily the Multimeter was
>>not in the grid position.  Replaced parts and it ran fine for years as
>>the second radio contest amp.
>>
>>The second time it blew almost every HV diode and again they were
>>replaced with higher rated ones, 1N5408's in this case. Finally, and not
>>trusting my gray matter at 3AM I just bent the bar down.
>>
>>Never did have to replace a filter cap and that amp got beat on pretty
>>hard.
>>
>>Carl
>>KM1H
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