So - feeling impatient - don't want to wait for my black brick to arrive
from back east.  I have a Dell adapter rated 19.5V at 6.7A, quite
adequate.
But it has this weird Dell connector, and I don't want to chop it off -
because
I still have the laptop.  What to do?

   The problem with the Dell adapter is that the outer barrel has an
outer and inner surface.  The outer surface is *minus*, just like most
other barrel connectors.  There is a pin in the middle, but it's a tiny
little thing, not made to carry substantial current.

   The positive end of this connector is the inner *surface* of the outer
*barrel*.  How to get at it?

   Went to the metalworking end of the shop, got out the Sherline lathe. 
Went to my bucket-O-bolts, and got a reasonable sized cheap ( crappy
steel ) bolt.  Chucked it in the lathe.  Turned down the outer diameter
to the exact inner diameter of the barrel - so it was a slip fit. 
Drilled a hole in the end so as not to touch that inner pin.  Chopped it
off the bolt, et Voila!  A temporary connector to the positive side,
suitable for clipping to with a clip lead.

   So now I can try out & set up the amplifier.

               - Jerry KF6VB






On 2021-06-04 13:52, jerry@... wrote:
> On 2021-06-04 12:20, R. Tyson via groups.io wrote:
>> I should have mentioned that Dan. The HP supplies I use to power the
>> 50w linear are old types.
>
> *** I think the one I bought is a "black brick".  I looked at the Ebay
> listing again, it's HP P/N 608432-003.  Googled the P/N, found it works
> with
> an "Elitebook 8560p".  Looked up "Elitebook" on Wikipedia - seems the
> 8560p
> came out in 2011.
>
>    So it's hopefully old enough to be OK.
>
>                     - Jerry KF6VB
>
>
>