[Elecraft] K3 Power Supply

[Dave G4AON]

Len

I've recently been using an SEC1223 switched mode supply, but started 
hearing wandering noises on 80m that came from the PSU, this was one of 
the later "CE Marked" units with output filtering. Some models of 
switched mode units appear to include a "tuning" control to move the 
birdies... The power supply has been replaced with a Racal 115-12-35 
(13.8 Volt, 35 Amp continuous rating) linear supply which doesn't emit RF!

I would no longer recommend any switched mode supply unless weight is a 
real issue. The Racal supplies are appearing on the UK surplus market 
(and eBay) in small quantities, they are "new old stock" and made by 
Newmar in California for Racal. Build quality is excellent, they include 
crowbar protection, over temperature shut down, circuit diagram and 
spare fuses. They weigh around 13 Kg, so are probably not economical to 
ship overseas.

73 Dave, G4AON
K3/100 #80
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Any good ideas?
Presently using an old (and heavy) Yeasy power supply, working very well
but - like many others I plan to bring my K3 on trips as well.
Anyone tested the MFJ-4125? In that case: How about the noise level?
Any other/better low weight switching power supplies?
Must say the K3 performs very well and has exceeded my expectations.
Len
SM7BIC