[Amps] Matchbox and relay

[Victor Rosenthal 4X6GP]

Yes, I remember the smell of burning selenium rectifier very well!
I am going to use the relay to switch my open-line fed antenna to a "T" 
configuration for 80m.
Incidentally, I love the Matchbox. There is nothing else like it. I 
think it could easily handle 4 kW on CW and SSB.

73,
Victor, 4X6GP
Rehovot, Israel
Formerly K2VCO
CWops no. 5
http://www.qsl.net/k2vco/
On 22/04/2020 13:29, Rob Atkinson wrote:
> If I remember correctly, some of the passive components around the
> rectifier were intended to prevent the relay from hot switching.  The
> KW Matchbox was intended to be an EFJ accessory to the famous Desk
> Kilowatt transmitter, a rig with a pair of 4-250s modulated by 810s.
> When running 1 KW input you don't want the relay hot switching.
> 
> Most Matchbox owners today (I have two of them) remove those parts
> because we do our sequencing in other ways.   The selenium rectifiers
> usually have a Vd of around 70 v.  Even if you plan to power the relay
> in the box as intended, I recommend replacing the S.R. with a common
> silicon diode because they can be nasty when they fail and burn out.
> They stink to high heaven and put out a toxic fume.
> 
> 73
> Rob
> K5UJ
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