On 01/01/2020 16:06, wrote:
On Wednesday, 1 January 2020 13:57:13 UTC, Dave Plowman (News) wrote:
Search DC power plug. Are you sure it is 6mm? Common is 5.5mm

Yes ... this page

https://myvolts.co.uk/product.php/10...r_power_supply

says that 5.5mm is OK for Type A.

Actually I've just compared the two. i can't tell the difference in the outer diameter between 4.4 and 6mm, but the inner hole is much thinner on the 5B supply and I think the pin is larger on the 5A. Hence (AFAICS) a 5A supply can be used on a 5B hub, but not the other way around.

The hole on a 5A supply looks larger than 2.1mm.


I visited a HH5 today. FWIW PSU was P/N 19118836, model no.
S018RM1200150, "for use with BT Home Hub 4 & 5 Type A"; my cheap
Workzone caliper gauge showed an external barrel diameter of 5.44mm; and
measured the diameter of a screwdriver which was a sloppy fit inside as
2.88mm.

--
Robin
reply-to address is (intended to be) valid