franliu
Posts: 2082
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AVR for 220v China and 100v Japan tube amps
« on: August 8th, 2016, 2:33pm »
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Many of the people in the web are now using 220v version tube amps made in China or 100v version amps from Japan and using a 230v/115v step down transformers.
Do you think Singapore's utility power is as declared, close to 230v? if you use a voltage mater or a multi-meter to measure it, you can see that, in most of the time during a day, it is closed to 240v instead of 230v!
This means your China made tube amps are working in 10% over voltage status, and your Japan made tube amps might running at 20% overvoltage or even more (if your are using a 230v/115v step down transformer). Tubes are very sensitive to the over-voltage and the consequence is to reduce the tube’s life by at least 20% or 50%.
The same situation applies to the users who use 110v output step down transformers to their Japanese version 100v power amps.
The low-end step down transformers can output 120-130v when unloaded or not heavily loaded.
These situations can caused up to 30% overvoltage and can reduce the tube’s life by 50% or more.
Now the solution is to use this Automatic Voltage Regulator.
This regulator can output voltage at both 220v and 100v with 2% accuracy. Regardless if the input utility voltage changes, or the load changes.
Specification:
Power rating: 1000w
Input voltage 165 - 240v
Output voltages:
1) 100v
2) 220v
Output voltage variance:
+- 2%
Country of Origin: Japan
Price: $300
SMS/Whatsapp 9189 2038
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