Tweakers' Asylum

Chinese Amp?

24.125.135.203

Awe-d-o-file

In Reply to: RE: Correct Voltage posted by Marc Almirall on March 09, 2010 at 14:22:05

There are a few posts over the years of people having problems with these 110V units. I would do something to give them what they want: 110, not the 117-122 average here in the states.

ET

Question "Authority", the mainstream media sucks - Go Independent and hold BOTH parties accountable instead of just the other guys!

Follow Ups:

RE: Chinese Amp tester - Craiger56 10:33:14 03/12/10 (0)
Best way to tell...
- http://www.consumeraffairs.com/recalls04/2010/fluke.html (Open in New Window)
RE: Chinese Amp? - Marc Almirall 17:55:51 03/11/10 (2)
I have been looking at some step down's online an can only seem to find units for stepping down 220 to 120 or 120 to 100. Do you think a step down like the 120/100 type for Japanese components would work?
- RE: Chinese Amp? - Dynaudio_Rules 14:31:33 03/12/10 (0)
  Here ya go
  
  Music is the Bridge between Heaven and Earth - 音楽は天国と地球のかけ橋
  - http://www.220-electronics.com/Transformers/trans/diamond-vo (Open in New Window)
- Here is one, but it might be too small. - Al Sekela 12:15:03 03/12/10 (0)
  B&K Precision makes one with 350 VA rating for servicing hot-chassis equipment (primarily antique radios). It has a range of output voltages. The price at Digikey is $240, and it is a non-stock item.
  
  However, the volt-ampere rating might be too small for your amp. Check the amp nameplate and multiply the rated voltage and current to estimate the VA requirement. For good sound, an isolation transformer should have at least double the VA rating.
  
  You need to investigate further to see what your problem is. If the amp's power transformer hum is caused by excessive line voltage and not DC on the AC, then a variable autotransformer will let you set the line voltage where you want it. A more expensive alternative would be a fancy audiophile conditioner that regenerates the AC and lets you control the output voltage and frequency. Raising the frequency lessens the stress on the power transformer in the amp.
  
  If the amp's transformer hum is caused by harmonic distortion of the AC, then my recent post below has some options for you.
  - pdf file for B&K Precision TR110 (Open in New Window)

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