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PSU1 to power 24v Rega Turntable |
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Fatmangolf
Moderator Group Joined: 23 Dec 2009 Location: Middlesbrough Status: Offline Points: 8998 |
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I may open my TT PSU up over the weekend and look at the internal power supply circuitry. There may be scope to improve what happens to the 24V ac coming in from the wall wart. It would also be interesting to know the operating current for the motor to find out if the transformer may be limiting this.
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Jon
Open mind and ears whilst owning GSP Genera, Accession M, Accession MC, Elevator EXP, Solo ULDE, Proprius amps, Cusat50 cables, Lautus digital cable, Spatia cables and links, and a Majestic DAC. |
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Fatmangolf
Moderator Group Joined: 23 Dec 2009 Location: Middlesbrough Status: Offline Points: 8998 |
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Having opened my TT PSU up I'm not convinced the 24V transformer is the limiting factor. If I wanted to improve the TT PSU I would replace the generic 1.000uF 50V smoothing capacitors and other parts with Rubicons or something similar. I would look at the voltage regulators as well. Together that might give a cleaner, more stable DC supply to power the 2 oscillators, the logic circuitry and the output amplifier that feeds the turntable's anti-vibration circuits and motor coils.
Other ideas. Check the trim on the 'phase 33' and 'phase 45' presets to minimise vibration, there is a VE thread on how to do this. I also found that connecting a ground wire to the 24V motor casing in my P3-24 cut the hum picked up by my moving iron cartridge. Grounding the sub-platter via the bearing housing helped. I used a jubilee clip but suspect one of the RP6 braces may be metal and so is grounding this already. Edited by Fatmangolf - 26 Jul 2015 at 7:23pm |
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Jon
Open mind and ears whilst owning GSP Genera, Accession M, Accession MC, Elevator EXP, Solo ULDE, Proprius amps, Cusat50 cables, Lautus digital cable, Spatia cables and links, and a Majestic DAC. |
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Drewan77
Senior Member Joined: 25 May 2013 Location: Chester,England Status: Offline Points: 1544 |
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Thanks Jon, you are probably right although beyond what I am capable of so I will see if I can try out the PSU1-AC Graham suggests and then report back. I have sent John Cadman an email
Neither of my MM cartridges produce hum on either turntable - both arms have separate earth leads to the studs on the Reflex M & Reflex Era Gold |
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Older than I once was, younger than I'll be
............................. Andrew |
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Drewan77
Senior Member Joined: 25 May 2013 Location: Chester,England Status: Offline Points: 1544 |
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I talked with John Cadman today and will be picking up a prototype PSU1-AC next week to try with the Rega TT-PSU. I will report back
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Older than I once was, younger than I'll be
............................. Andrew |
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Fatmangolf
Moderator Group Joined: 23 Dec 2009 Location: Middlesbrough Status: Offline Points: 8998 |
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Thanks Andrew. Do you have the old grey TT PSU I have from c2010 or the new version, please?
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Jon
Open mind and ears whilst owning GSP Genera, Accession M, Accession MC, Elevator EXP, Solo ULDE, Proprius amps, Cusat50 cables, Lautus digital cable, Spatia cables and links, and a Majestic DAC. |
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Drewan77
Senior Member Joined: 25 May 2013 Location: Chester,England Status: Offline Points: 1544 |
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If successful, John says he can provide a toggle switch & two output leads to power both TTs independently. The Rega wall-wort output plug is exactly the same size as on the standard GSP PSU1. |
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Older than I once was, younger than I'll be
............................. Andrew |
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Fatmangolf
Moderator Group Joined: 23 Dec 2009 Location: Middlesbrough Status: Offline Points: 8998 |
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Very good service from GSP as always. Fingers crossed for the hoped for improvement in power regulation and speed stability.
I asked in case you had the old version like my TT PSU. I considered doing a quick parts upgrade to loan to you for an AB comparison Andrew. |
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Jon
Open mind and ears whilst owning GSP Genera, Accession M, Accession MC, Elevator EXP, Solo ULDE, Proprius amps, Cusat50 cables, Lautus digital cable, Spatia cables and links, and a Majestic DAC. |
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