New Paul Hynes SR5 Power Supply

[Marco]

Hi Paul,

Thanks for that - sounds straightforward enough

Marco.

[MartinT]

I'd also like to fit it to the XLR plug you supplied with the adaptors you made up to take a 2.5mm DC connector, so that the end of the adaptor (with the XLR plug) goes into the SR5, presuming that the XLR plug you used is of decent quality for the job I have in mind?

Marco, if you keep the 2.5mm connector in circuit you're not going to benefit much by use of the Kimber cable. You need to solder the cable to the Technics PCB and the XLR plug to the other end, eliminating the 2.5mm connections altogether. I will be doing the same as soon as I receive the Neutrik plug.

[Marco]

Hi Martin,

Sorry if I didn't make myself clear - that's exactly what I intend to do

Which DC cable are you going to use, or did Paul provide something suitable along with the SR5?

I'm still using the original cable supplied with my old Timestep PSU, as that's what was already soldered into position. It's a bit too thin, though, and not of particularly great quality, which is why I'm going to use the Kimber DC cable supplied with the Russ Andrews 'Dynapak' PSUs. I obtained some of this cable, as a special order, a while ago.

It's the same as shown here, fitted to the Russ Andrews Dynapak DC PSU (the cable is the usual Kimber RFI-rejecting 'woven' design - like a thinner version of the stuff used in their Classic Powerkords):





I was using it when I had my old KAB PSU (where it was a big upgrade on the usual supplied 'black & white' DC cable), but Dave C didn't want to retain it when he fitted the Timestep, as he said it was, I quote: "an unknown quantity"....

Anyway, one end will be hard-wired to the Techie's PCB, and the other fitted with an XLR plug, to go into the back of the SR5. That should give a further sonic improvement

Marco.

[freem]

I have been following this thread with interest as I have an SR5 on order.
Perhaps someone could explain please what is the dual regulated mod as mentioned by Paul.

[Paul Hynes]

Hello Paul,

The dual regulation mod is the next level of power supply upgrade for the SL1200/1210 after the installation of the SR5. It is an internal modification of the SL1200/1210 printed circuit board and installation of two additional voltage regulators. It consists of separating the power feed to the control circuitry and the motor drive circuitry and providing each with a separate high performance voltage regulator.

Separating the regulation for the control circuitry and the motor drive circuitry reduces interaction between these stages, via the power line on the internal printed circuit board, and this also improves the sound quality of the deck giving a more open and stable sound stage with improved dynamic scale.

The external SR5 power supply is then adjusted to 27 volts to provide pre-regulation of the two internal regulators, effectively providing two layers of supply line interference rejection and making the deck much less susceptible to performance variations caused by varying mains quality.

Aside from the above improvements there is also a nice improvement in low-level information retrieval with these modifications.

This level of power supply upgrade requires reasonable DIY experience, as some printed circuit track surgery is required as well as wiring in the two additional voltage regulators. For those who do not wish to implement this modification themselves I will be offering this upgrade as a service in the New Year once the holidays are over.

Regards
Paul

[freem]

Hello Paul,

The dual regulation mod is the next level of power supply upgrade for the SL1200/1210 after the installation of the SR5. It is an internal modification of the SL1200/1210 printed circuit board and installation of two additional voltage regulators. It consists of separating the power feed to the control circuitry and the motor drive circuitry and providing each with a separate high performance voltage regulator.

Separating the regulation for the control circuitry and the motor drive circuitry reduces interaction between these stages, via the power line on the internal printed circuit board, and this also improves the sound quality of the deck giving a more open and stable sound stage with improved dynamic scale.

The external SR5 power supply is then adjusted to 27 volts to provide pre-regulation of the two internal regulators, effectively providing two layers of supply line interference rejection and making the deck much less susceptible to performance variations caused by varying mains quality.

Aside from the above improvements there is also a nice improvement in low-level information retrieval with these modifications.

This level of power supply upgrade requires reasonable DIY experience, as some printed circuit track surgery is required as well as wiring in the two additional voltage regulators. For those who do not wish to implement this modification themselves I will be offering this upgrade as a service in the New Year once the holidays are over.

Regards
Paul

Thanks Paul for the explanation. I will be in touch after Christmas.

[DSJR]

Is all this in addition to Dave C's regulator mod, or instead of? Dave has provided measurements showing the difference his regulator mod made and it was quite extensive. if this is done, would a double reg really make things any better or just introduce more complexity?

[Reid Malenfant]

I'm not sure but you may recall Dave that i mentioned this on another thread

I brought up the fact that in effect the voltage regulation wasn't taking place where it was actually needed, but at the power supply itself. What's needed to get the very best out of the 1210 is a quality regulator that controls the voltage right at the 1210 PCB, rather than up to 1M away with all the fluctuations that current draw over the cable resistance will cause

At that point Paul joined in the thread & mentioned he was working on a couple of regulators that will each be in control of one part of the TT systems. Splitting the contol circuits (which use little current & much more uniform current draw) from the motor power circuits that will draw current in big pulses makes perfect sense.

You may think of it as more complex, but in reality it's far harder to regulate a supply that has big current fluctuations. Splitting it will bring pretty big benefits as well as having the regulation exactly where it's needed & not at a distance. In certain respects making things a tad more complex makes things a lot easier & will definately improve things

[Wakefield Turntables]

Hello Paul,

The dual regulation mod is the next level of power supply upgrade for the SL1200/1210 after the installation of the SR5. It is an internal modification of the SL1200/1210 printed circuit board and installation of two additional voltage regulators. It consists of separating the power feed to the control circuitry and the motor drive circuitry and providing each with a separate high performance voltage regulator.

Separating the regulation for the control circuitry and the motor drive circuitry reduces interaction between these stages, via the power line on the internal printed circuit board, and this also improves the sound quality of the deck giving a more open and stable sound stage with improved dynamic scale.

The external SR5 power supply is then adjusted to 27 volts to provide pre-regulation of the two internal regulators, effectively providing two layers of supply line interference rejection and making the deck much less susceptible to performance variations caused by varying mains quality.

Aside from the above improvements there is also a nice improvement in low-level information retrieval with these modifications.

This level of power supply upgrade requires reasonable DIY experience, as some printed circuit track surgery is required as well as wiring in the two additional voltage regulators. For those who do not wish to implement this modification themselves I will be offering this upgrade as a service in the New Year once the holidays are over.

Regards
Paul

Paul,

I'm going to be borrowing Marco's SR5 next month at some point so I cant wait to see your handywork! I have a few questions. Firstly, will you be publishing or supplying relevant kit for this mod so us "tweakers" can have a crack at installing it. Secondly, how many levels of voltage regulation could be added to the 12xx series and would we start getting the laws of diminishing returns with regards to the number of levels of regulation regards information detail?? I'm thinking of some threads I've been reading about CD modifications where there seems be voltage regulation for every circuit on the PCB!!

[Marco]

I'm not sure but you may recall Dave that i mentioned this on another thread

I brought up the fact that in effect the voltage regulation wasn't taking place where it was actually needed, but at the power supply itself. What's needed to get the very best out of the 1210 is a quality regulator that controls the voltage right at the 1210 PCB, rather than up to 1M away with all the fluctuations that current draw over the cable resistance will cause

At that point Paul joined in the thread & mentioned he was working on a couple of regulators that will each be in control of one part of the TT systems. Splitting the contol circuits (which use little current & much more uniform current draw) from the motor power circuits that will draw current in big pulses makes perfect sense.

You may think of it as more complex, but in reality it's far harder to regulate a supply that has big current fluctuations. Splitting it will bring pretty big benefits as well as having the regulation exactly where it's needed & not at a distance. In certain respects making things a tad more complex makes things a lot easier & will definately improve things

I'm liking the sound of that! I therefore can't wait to have my T/T's PSU configured that way - this is going to be MEGA!!

Paul, is that what Anthony and you have been working on, and if so, will he have all the bits necessary to do the job (and be aware of what's involved)?

Marco.