External power supply (YOP-1) for Yamaha GT-2000

Mark B

Mark B

Yamaha Fan
Subscriber
I've been considering getting an external power supply -- the YOP-1 -- for my GT-2000 for quite a while, and I finally decided to pull the trigger on an aftermarket version.

When not using the external power supply the GT-2000 converts 100 volt AC to 24 volt DC and runs off 7 watts. The external power supply directly supplies 24 volts of DC, so it bypasses the internal conversion from AC to DC.

I've got the aftermarket YOP-1 hooked up and the GT-2000 is making beautiful music, so I know the power supply is at least functional. Here are a couple pictures of it:

unnamed.jpg unnamed-1.jpg
 
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I'll await your further impressions with interest. I regard the external power supply as the first optional accessory to purchase. I feel that the fundamental improvement to the sound quality provided by the power supply marks it out as a prerequisite to achieving what the designers intended for the GT 2000 series.
 
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IMG_0963.JPG IMG_0969.JPG This brings up a question I have about my GT2000. I know these tables were designed to run on 100V for the Japanese market and weren't distributed to the states. My table has the badge on the back stating 100V 7W but the electrical cord which appears to be original, has 125V plainly embossed on it with a standard two prong plug. Does anyone else have this? I've run the table for over ten years on 125V and it's performed flawlessly, but now I'm concerned I'm damaging the motor. I have a step down converter for 110/125 to 100 volts, but I'd have to find an adapter to change the plug configuration. An external power supply would eliminate the problem if there is a source available.
 
Badger said:
View attachment 750811 View attachment 750812 This brings up a question I have about my GT2000. I know these tables were designed to run on 100V for the Japanese market and weren't distributed to the states. My table has the badge on the back stating 100V 7W but the electrical cord which appears to be original, has 125V plainly embossed on it with a standard two prong plug. Does anyone else have this? I've run the table for over ten years on 125V and it's performed flawlessly, but now I'm concerned I'm damaging the motor. I have a step down converter for 110/125 to 100 volts, but I'd have to find an adapter to change the plug configuration. An external power supply would eliminate the problem if there is a source available.
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All of the available aftermarket YOP equivalent power supplies run off 100v also.
 
Badger said:
View attachment 750811 View attachment 750812 This brings up a question I have about my GT2000. I know these tables were designed to run on 100V for the Japanese market and weren't distributed to the states. My table has the badge on the back stating 100V 7W but the electrical cord which appears to be original, has 125V plainly embossed on it with a standard two prong plug. Does anyone else have this? I've run the table for over ten years on 125V and it's performed flawlessly, but now I'm concerned I'm damaging the motor. I have a step down converter for 110/125 to 100 volts, but I'd have to find an adapter to change the plug configuration. An external power supply would eliminate the problem if there is a source available.
Click to expand...

All Japan market tables are designed for 100 volts power line. Use step down transformer or third party 24V power supply instead of YOP-1 There is no magic there. YOP-1 is a simple linear power regulator with over-current protection and remote sensing to eliminate cable influence.
 
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Badger said:
View attachment 750811 View attachment 750812 This brings up a question I have about my GT2000. I know these tables were designed to run on 100V for the Japanese market and weren't distributed to the states. My table has the badge on the back stating 100V 7W but the electrical cord which appears to be original, has 125V plainly embossed on it with a standard two prong plug. Does anyone else have this? I've run the table for over ten years on 125V and it's performed flawlessly, but now I'm concerned I'm damaging the motor. I have a step down converter for 110/125 to 100 volts, but I'd have to find an adapter to change the plug configuration. An external power supply would eliminate the problem if there is a source available.
Click to expand...
The power cord on my GT-2000 is embossed with 15A 125V and the name Yamaha. I'm sure it's the original power cord. I use a step down transformer that converts 110-130 input voltage to 100V output.
 
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In the final wash-up, the operating voltage is that which is stated by the compliance plate on the rear of the turntable. Every GT 2000 compliance plate states 100v. The only exception was the connection of the 24v feed from the YOP-1 outboard power supply. Never was a GT 2000 made to operate on anything other than 100v. It is a very straightforward matter.
 
theophile said:
I'll await your further impressions with interest. I regard the external power supply as the first optional accessory to purchase. I feel that the fundamental improvement to the sound quality provided by the power supply marks it out as a prerequisite to achieving what the designers intended for the GT 2000 series.
Click to expand...
I spent a couple of hours last night switching back and forth between the stock power supply and the external power supply. This isn't an ideal methodology as it takes a minute or so to switch between power supplies and re-queue the track being compared. I also clean the stylus after each track to eliminate stylus condition from affecting the results. I used the Analogue Productions 45 rpm pressing of Cat Stevens Tea for the Tillerman for testing. It's too early to report my listening impressions.
 
for_p1 said:
All Japan market tables are designed for 100 volts power line. Use step down transformer or third party 24V power supply instead of YOP-1
Click to expand...
Mark B said:
I spent a couple of hours last night switching back and forth between the stock power supply and the external power supply. This isn't an ideal methodology as it takes a minute or so to switch between power supplies and re-queue the track being compared. I also clean the stylus after each track to eliminate stylus condition from affecting the results. I used the Analogue Productions 45 rpm pressing of Cat Stevens Tea for the Tillerman for testing. It's too early to report my listening impressions.
Click to expand...

The only potential difference should be noise induced from internal power transformer into cartridge or tonearm wires. When external power supply is used, no power line AC is present inside turntable. External power supply circuit is very simple and unlikely is better than internal one. This difference may or may not be heard. But you need to listen noise from speakers WITHOUT anything playing to find it. Groove noise and noise embedded into record should mask any difference.
 
Transformers are sources of mechanical vibration. Removing the power supply electronics to an off-board location eliminates this source of vibration from within the plinth.
 
Badger said:
I've run the table for over ten years on 125V and it's performed flawlessly,
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Whether the GT2000 or another Japan 100v table I would never run them on 115v or what ever you actually get
from your utility. Which can vary depending on location etc.
There are those that "say" if the amperage draw is low its ok to just plug it in but I'm not one of them. I also
use a step down transformer.
 
I have a 220V aftermarket power supply. There is a supplier that on request makes them for other voltages than 100V. Comparing a stepdown transformer + internal power supply to this external power supply, I thought the external sounded noticeable smoother & more detailed. There appears to be better filtering. The external power supply also has a breaking fucntion that stops the platter when you turn off the turntable.
 
Plato65 said:
I have a 220V aftermarket power supply. There is a supplier that on request makes them for other voltages than 100V. Comparing a stepdown transformer + internal power supply to this external power supply, I thought the external sounded noticeable smoother & more detailed. There appears to be better filtering. The external power supply also has a braking function that stops the platter when you turn off the turntable.
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Fixed.

That's interesting.
 
Ok, I'm convinced I should run the table on 100V. But, can anyone tell me why a corporation like Yamaha would build a table to be run on 100v but put a plug on it that is only compatible with a 125v outlet? Where's the logic in that? Like I said, I've bought a convertor to take the line voltage down to 100v but will have to get an adapter to change the plug configuration on my table to fit it. Just trying to figure out what the engineers had in mind.:dunno:
 
there's very little difference in the plugs between 100V and 125V; I have a power strip that I bought in a Lawson's in Tokyo in my laptop bag because the hotel room I stayed at didn't have a receptacle near the bed and I was lazy and wanted to use my laptop in bed...
 
Badger said:
Ok, I'm convinced I should run the table on 100V. But, can anyone tell me why a corporation like Yamaha would build a table to be run on 100v but put a plug on it that is only compatible with a 125v outlet? Where's the logic in that? Like I said, I've bought a convertor to take the line voltage down to 100v but will have to get an adapter to change the plug configuration on my table to fit it. Just trying to figure out what the engineers had in mind.:dunno:
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Maybe the plug is used for different purposes and tells you the maximum voltage and current (15A) the plug itself can handle. So, not really related to the gear it is used on.
 
My apologies for not posting my listening conclusions in this thread in a timely manner.

Because the method I used to do the A/B compare (described in post 9) resulted in a 1 minute lag between compares, it took awhile for me to identify and be confident of the differences I was hearing.

What I heard was the GT-2000 sounded more focused and coherent with the YOP-1. There wasn't a night and day difference in the sound, but the difference was distinct enough to be readily apparent if one was able to do instant A/B switching when doing the comparison.

The YOP-1 is a very worthwhile upgrade to the GT-2000.
 
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Are there any USA GT2000 owners who want to try out my aftermarket YOP-1.

It doesn't seem to work with my TT and I want to see if it is just my TT at fault. I measured the output and it reads 12v as it's supposed to.

I will pay for shipping to you and back.

Thanks
 
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