[Amps] Fw: Step Start on a 3KA Amp

[PA3DUV]

Thats right Harold.
But when one switches the amp on the switching of the triac can be heard on 
the HF transceiver.
However, this is not really an issue since it disappears in approx. 2 
seconds. I haven't heard of any problems with this softstarter so I guess it 
is a technically sound solution.
At least in my twin GU84B amp with 3 phase power supply the 3 softstarters 
(one per phase) perform very well.

Cheers, Dick
PA3DUV

----- Original Message ----- 
From: "Harold Mandel" <ka1xo at juno.com>
To: "'PA3DUV'" <pa3duv at planet.nl>
Sent: Thursday, September 21, 2006 1:26 PM
Subject: RE: [Amps] Fw: Step Start on a 3KA Amp


> Dick,
>
> I think the Emtrons are zero crossers.
>
> Pat Stein uses them in the Commander series, too.
>
> The amp never makes a thump when it's switched on,
> not like the Alpha clone that makes the floor jump.
>
> Hal
>
>> Ian,
>>
>> A picture of the Emtron switched mode softstarter + schematic diagram are
>> available at:
>>
>> http://ph.groups.yahoo.com/group/ham_amplifiers/photos
>>
>> I've heard that Emtron is selling their softstarter as a seperate item.
>> This softstarter is a small switcher which chops the AC voltage, by doing
>> so limiting the inrush current.
>>
>> Cheers, Dick
>> PA3DUV
>>
>
>