Sounds like the input swamping should be disconnected from the tube for 5ms
and just act as a dummy load (-;
Either that or include a warning "This amp is not suitable for Icom rigs)"
Carl
KM1H
----- Original Message -----
From: "Joe Subich, W4TV" <lists@subich.com>
To: <amps@contesting.com>
Sent: Thursday, July 26, 2012 3:11 PM
Subject: Re: [Amps] Overdrive protection
>
>> My question -- and maybe there's an Alpha employee on the list who
>> wants to answer -- is "isn't it possible to make an overdrive
>> protection circuit that will cause the amplifier to fault fast enough
>> to protect the tubes and components?"
>
> Of course there is but such a protection circuit would make the amp
> almost impossible to use with the many rigs have have a horrendous ALC
> spike on initial key-down. Many of the most commonly used rigs produce
> a full power (or higher) 2-5 ms long even when cranked back to 30 or
> 40 watts.
>
> 73,
>
> ... Joe, W4TV
>
>
> On 7/26/2012 12:36 PM, Vic K2VCO wrote:
>> Alpha's email newsletter talks about damage to amplifiers as a result of
>> overdrive -- the
>> example is given of amplifiers designed to produce 1500w output with 40w
>> drive being
>> driven with 150w. They say that there is a log maintained by the firmware
>> which records
>> overdrive incidents and that they won't repair damage caused by this kind
>> of abuse under
>> warranty.
>>
>> I am sympathetic to their attitude and don't approve of the philosophy
>> that all knobs
>> should always be set to 11. But sometimes it's unintentional.
>>
>> My question -- and maybe there's an Alpha employee on the list who wants
>> to answer -- is
>> "isn't it possible to make an overdrive protection circuit that will
>> cause the amplifier
>> to fault fast enough to protect the tubes and components?"
>>
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
>
> -----
> No virus found in this message.
> Checked by AVG - www.avg.com
> Version: 10.0.1424 / Virus Database: 2437/5155 - Release Date: 07/25/12
>
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|