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Turntable power supplies for decks with AC motors


AC motors spin at the speed set by the frequency of the mains supply they are connected to, in the UK this is 50Hz (I.e. 50 cycles of a sine wave form per second).


Which decks respond to power supplies?

Basically if your turntable doesn’t already have an electronic power supply (either internally or externally) and uses an AC motor then it should really benefit.


In terms of matching a power supply to your deck all you really have to be aware of is its  power consumption, which is generally listed on the back of the deck or in the manual. However as a generalisation most decks on the market (Linn LP12, Rega, Systemdek and so on) use basically the same type of motor and will work with any of the universal power supplies.


Why do they work?

The circuit inside most turntables is in essence a very basic Resistor/Capacitor network. The capacitor is in place to make sure that the platter always spins in the right direction when you turn it on. This is a very cheap and simple way of making a turntable, and in a perfect world would be a perfectly satisfactory. However this not being the case the motor ends up directly seeing all the impurities and irregularities that are a feature of the mains supply.


For example whilst in the UK the mains is supposedly 50Hz it actually varies*, this can results both in absolute pitch change and stability problems. So the ability to generate a new mains waveform can be very beneficial, not only do we guarantee that the speed remains stable but it should also be possible to make it much cleaner with less noise and distortion than exists on the mains.


*in fact all the electricity board have to do is maintain an average of 50Hz with a 1% tolerance throughout the course of 24 hours, to ensure that AC powered clocks keep good time over the course of a day.


Why are some power supplies more expensive than others?

Despite the apparently simple brief of producing a power supply that outputs a simple sine wave there’s a lot more to it than that. The quality of the waveform produced (in terms of its distortion), its tolerance of frequency variation and background noise are all elements that go towards explaining why some are more expensive and (all things being equal) better sounding.


Project Speedbox MkII

Specifically intended for use with Projects own turntables, this box outputs a high quality wave form for the 16V motors used on their decks. It also provides the convenience of electronic speed change.


Project Speedbok MkII: £105.00


Rega TT PSU

The Rega TT PSU is designed for use with all the latest 24 volt motor Rega turntables, including the P3 24v as well as the P5 and P7 (and all older Rega turntables that have been retro fitted with their 24volt motor upgrade kit). The TT-PSU gives additional convenience thanks to the easy 33/45rpm switch on its fascia, as well as reduced motor noise and improved speed stability.


The latest version picture here features improved power supply regulation, output circuit protection and a new anti vibration circuit.


Rega TT-PSU turntable power supply: £198.00


Edwards Audio Iso-1

The Edwards Audio Iso1 uses a high quality  mains isolation transformer, an approach we’ve been championing for many years due to the excellent results they achieve. This can be used with any turntable, from Regas through to Garrards and can also be beneficial when used before other turntable power supplies (as well as CD players, pre amps - in fact anything that draws less than 40 watts).


The resulting improvement in sound is greater timing and dynamics, with blacker backgrounds and a generally cleaned up sound, and due to its near universal nature it can stay with the system as you upgrade, making it a very cost effective upgrade.


Edwards Audio Iso-1 £199.95



Martin Bastin Wave Mechanic: £500

The Wave mechanic is a mains regenerator much like the Project above, but as its price suggests its made to a much higher standard. It outputs a single frequency so you don’t get the convenience of speed change buttons (you have to move the belt on its pulley as before), but it does allow very fine tuning of the speed via the front mounted rotary control. It is supplied with a female IEC connector to fit to your turntables power cable as well as a strobe disc to ensure that the speed is set accurately. The standard version has a power output in the region of 7-8 watts which is suitable for most turntables except for those with very powerful motors (Garrard 301/401 etc).

 

-Martin Bastin Wave Mechanic : £500


Above: rear of Wave Mechanic


Martin Bastin supply for AC Gyrodecs

This is a special power supply made for the earlier AC motor Gyrodecs, these use a very high quality 24 volt Papst motor (which was only changed to a DC motor in later production due to it being discontinued), and to us are one of the best sounding motor setups used. This power supply has been produced both to give those people who have the original (somewhat basic) transformer supply an upgrade as well as those people wanting something better than the original dedicated QC power supply.


The Martin Bastin Gyro Supply (as we’re calling it) has been specially commissioned by us, and was originally intended just for one customer who wanted a custom power supply for his deck, but the results were so good we decided to make it available to everyone.


Like all the Martin Bastin power supplies, this very well engineered supply produces a very clean wave form, it’s effectively a signal generator that feeds a power amplifier stage which is then coupled to the motor via an output transformer.


This design uses a single speed circuit (so you will need to move the belt on the motor pulley to change between 33 and 45rpm  - which is no hardship on a Gyrodec of course), and has very fine speed control  which can be used to setup the speed precisely with the supplied strobe disc and Zapper strobe light.


In comparison to the already very good Michell QC power supply, the Martin Bastin Gyro Supply is a definite step up. The first thing you notice is that the QC seems surprisingly ragged at the top end, you notice cymbals are splashy and grainy, an effect that goes when the Martin Bastin Gyro Supply is connected. The improvement is not just limited to the high frequencies either, the pitch seems more stable, there are improvements to timing and the bass is more clearly purposeful.


Martin Bastin Gyro Supply 24v AC power supply: £560.00



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