Redrum wrote: 
> If I might add one thing to confirm when sourcing a supply. The sb3
> power supply, per spec, is center (pin) positive. Center positive are
> probably the most common, but there are center negative/barrel positive
> supplies out there (some audio and guitar gear). The idea of a center
> negative is the pin makes contact first, establishing the gnd before
> applying the supply (at least I think that's why)

Good point about the "centre positive" - it is often illustrated on the
plug.  Below is a photo of old SB3 PSU and on the line with "I.T.E.
Power supply" you can see the "-" is the outside and "+" is the centre.

37421


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