Re: Remote Power Supply Connection

"Ian Iveson" <IanIveson.home@[EMAIL PROTECTED]
> wrote in message 
news:crMWj.5272$1q4.981@[EMAIL PROTECTED]
> Trevor Wilson wrote:
>
>>>
>>> Put simply the use of an outboard power supply chassis is the OPTIMUM 
>>> way
>>> to achieve the BEST possible performance.
>>
>> **Nonsense. Whilst an external power supply *may* have some advantages,

>> transferring large amounts of DC is a dumb thing to do. Using AC is far

>> more sensible. Capacitors need to be placed close to output devices,
not 
>> many cm away.
>
> A remote PS definitely has the advantage of isolating the amp from the 
> vibration of the power transformer, and vibration is definitely a bad 
> thing for valve amps. It also definitely an easy way of decoupling the 
> magnetic fields of the output and power transformers.

**You may care to note that I said that transferring *AC* Voltages was 
acceptable. It is the transfer of high Voltage DC (at substantial current)

where problems can arise.

>
> In most cases you would surely need a long cable before the PS caps
became 
> significantly estranged from the demands of an audio amp? A small cap in

> the amp itself would make up for the distance I think.

**Depends what you mean by "small", but yes, capacitance in the amplifier
is 
essential when using remote power supplies.

>
> But perhaps you had another issue in mind?

**Plugging and unplugging high Voltage DC connectors is a dangerous thing.

AC is not a problem.

>
> Also, transferring the filter caps to the amp would mean that both plug 
> and socket would be live at the time of parting. I have seen it said
that 
> a diode in the amp solves this problem, but I wouldn't entrust my life
to 
> that solution.

**I would not entrust any easily available connector to high Voltage DC.

Trevor Wilson