Following on from my initial search for a power supply I need to be sure I
get the correct tip size.

I have found a power supply in the house which fits - 60mA power supply for
a radio - and when plugged in and the amp turned on the light comes on :-)
I am assuming that a 60mA power supply wouldn't be expected to do any more
with a demand from the amplifier of 2A - 5A depending on which information
I believe.

Using my digital calipers the outside diameter of the plug seems to be
between 5.5mm and 5.7mm and the internal diameter (female plug) about 2mm.

Diameter of the male part in the back of the amp is about 6mm - but I note
that there is a spring clip so possibly a slightly smaller external diameter
would also work.

Internal diameter of the female plug seems to be about 2mm.
Depending on the effort I expend the caliper reads between 2.0 and 2.08mm.
I can't get the calipers on the pin inside the socket of the male side.

All in all, taking the rough with the smooth, and with a following wind,
something like
http://www.ebay.co.uk/itm/12V-12-VOL...item4167968c97
which quotes the female pin as
"Output Plug : Female 2.1 x 5.5mm"
might well do the job.

However, given the random nature of the female plugs I am wondering how much
leeway there is in plug sizes.

Perhaps if there is a spring in the socket pushing on the outside of the
female plug then if the internal diameter is slightly over size then there
will still be a firm contact on one side.

So the usual uncertainty.
The upside is that the 2.5/5.5 size seems common for LCD TV power supplies
of which there are many.

So as usual, advice and reassurance most welcome.

Cheers

Dave R

--
No plan survives contact with the enemy.
[Not even bunny]

Helmuth von Moltke the Elder

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On Monday, December 10, 2012 1:54:50 PM UTC, David WE Roberts wrote:
Following on from my initial search for a power supply I need to be sure I
get the correct tip size.

not hard to replace the connector if needed