PSU1 to power 24v Rega Turntable

Is there a possibility to adapt a GSP PSU1 to supply 24v to a Rega TT-PSU in place of the Rega wall-wort?
I have been considering a power supply from elsewhere but it occurred to me that this may be suitable & I would rather purchase from GSP if it was feasible

Not so fast Jon!

I registered an AC version when I got the CB certificate back in 2003 (or was it 2004?)

However, it might not be exactly 24 V AC. I have to test that out, and transformers (what the AC comes out of) have a thing called transformer regulation, which means the voltage is higher no-load than it is loaded.

I also have to check what the certificate said about the output current. Although it can do 12 AC Watts it was tested to the worst possible outcome, which limits what we can declare.

Quite odd I thought: some Chinese power supplies supposedly carrying the same approval and transformer rating are allowed to declare much higher output current.

(so honesty is the best policy?...)

Sorry to disagree but the TT PSU isn't just an AC to AC transformer. That model of the PSU1 has an AC output available from the internal transformer and it may well be slightly better than the equivalent AC to AC transformer Rega supply, but it is not going to match what the TT PSU does. The Rega TT SU is DC powered with an oscillator producing a clean 50Hz sine wave for 33 1/3 rpm and 67.5 Hz for 45 rpm which boosted to drive the turntable's motor.

The label says it has a 50Hz input which is the mains frequency common to all UK mains supplies (and is 50Hz in many other countries using 220-250 volts)

It doesn't state the output frequency, but if it is just a transformer inside then its output will still be 50Hz.

The voltage is stated as 24. It has a squiggle after it that means it is AC (alternating current - just like the mains is). If it were a different frequency safety rules say the frequency should be stated.

It also shows the current rating which is 350mA, and that should be taken as meaning the maximum safe current that can be "drawn".

To me it looks just like any other OEM plug-top transformer badged up at no extra cost if you order sufficient. I once did the same and my guess is it is made by the same Chinese company.

If my memory serves me well the on-load voltage of the PSU1 transformer is 23 volts. The output current we are allowed to rate the product at whilst conforming to IEC60950 is 200mA but it is capable of much more. Since going from regular fuse protection to an internal transformer winding resetable fuse, the output current can be much more, but to be able to rate it higher we would have to put it through compliance testing again, but don't have the spare £10K to do it. Most manufacturers choose the easy route of buying in a certified power supply - even those who could afford to get their own through the certification process.