Re: Remote Power Supply Connection

On May 20, 11:17 pm, "Ian Iveson" <IanIveson.h...@xxxxxxxxxxxxxxxx>
wrote:
Iain wrote:
A lurker on this thread wrote to tell me that he has seen
a
German built KT88 amp with a separate PSU and a DC
umbilical.  Both units have the DKE and  CE mark.
He has promised to try to find a link to the manufacturer
for me.

Presumably this lot consider themselves kosher.

http://www.borderpatrol.net/

They don't show cages, either, which seems risky to me.

Have you seen how their PSUs connect to the amps? I'd be
interested to know which bits are CE marked.

Who has the right, I wonder, to have sight of the
manufacturer's statement of conformity? Can anyone challenge
the safety of equipment?  Conformity appears to be self
regulated, which to me means safety-in-numbers political
back-scratching.

For a small newcomer to the market, I maintain it would be
foolhardy to devise a novel solution. But if you are
empowered to CE mark your produce, and can copy the
important principles of an established current design, and
confidently produce a statement of conformity that shows you
have considered the issues properly and dealt with them
wisely, you may have an outside chance in court if someone
gets electrocuted.

My biggest concern with my own amps is the relative
mechanical fragility of the cable and connector assembly.
The amps and power supply are heavy enough so if one amp
fell of a shelf with a foot or so of slack in the cable, it
could rip a cable partly or completely out of its connector.
If the power supply were to fall, it would be Total
Carnage...I think the amps would get slapped against the
wall and the PS would go through the floor. I solved this
problem by putting it on the floor, but someone else might
not.

We should encourage a fashion, amongst rich audiophiles, for
very large integrated amplifiers, allowing PSUs to be
distant, but in the same case. They could have wheels and
pull-out handles, like posh suitcases. What are they made
of? If they make them in ally I might have just had a good
idea.

Ian

No connector should be "solid" at any end in this sort of
applications. Both ends should be suitably socketed against the sort
of eventuality you describe. Mil.Spec. connectors and some medical
connectors, machine-tool connectors and others are locking-types for
very good reasons - the consequences of a fall such as you describe
may be far less than an accidental unplugging - but that sort of
equipment has suitable strain-relief designs as well.

I would posit the umbilical should be male at the P/S, female at the
Amp. The strain-relief to the (presumably armored) cable should be
sufficient to carry the weight of either end, but, again, the
connector should come apart well before umbilical failure. And given a
proper design along the lines Patrick has described, DC voltages would
either drop within a few millesconds, or be entirely disconnected. The
days of the old Dynaco/Eico octal plugs at either end of the umbilical
to octal sockets at either component is simply nuts any more - 'cept
for Bret, of course.

Peter Wieck
Melrose Park, PA
.

Relevant Pages

  • Re: Remote Power Supply Connection
    ... Both units have the DKE and CE mark. ... Have you seen how their PSUs connect to the amps? ... Conformity appears to be self ...
    (rec.audio.tubes)
  • Re: Remote Power Supply Connection
    ... Both units have the DKE and CE mark. ... Have you seen how their PSUs connect to the amps? ... of conformity? ...
    (rec.audio.tubes)
  • Re: Connecting Power supply to Motherboard Processor Socket
    ... The motherboard come with a 2X4 socket ATX_12V_2X4. ... If you look in the user manual, on page 22, the table for the ATX12V connector, ... "+12V" pins listed in the following table. ... the 2x2 could be rated anywhere from perhaps 6 amps per pin to 10 amps per ...
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  • Re: Thoughts on this little oddity, anyone ...?
    ... No schematics, but problem was quickly traced to an open circuit resistor, by comparison ohms checks between the two amps. ... The power rails and ribbon from the mixer desk section were on removable connectors, but the 4 pole speakon connector was bolted to the rear panel and the wires were soldered directly to the board. ... When I came to unsolder these wires from the socket, I noticed that the "B" channel one was wired the opposite way round to the "A" channel one. ... I then went back to the power amps' front ends near where the ribbon connector was, ...
    (sci.electronics.repair)
  • Re: Thoughts on this little oddity, anyone ...?
    ... No schematics, but problem was quickly traced to an open circuit resistor, by comparison ohms checks between the two amps. ... The power rails and ribbon from the mixer desk section were on removable connectors, but the 4 pole speakon connector was bolted to the rear panel and the wires were soldered directly to the board. ... When I came to unsolder these wires from the socket, I noticed that the "B" channel one was wired the opposite way round to the "A" channel one. ... I then went back to the power amps' front ends near where the ribbon connector was, ...
    (sci.electronics.repair)