so my question is: have I been ripped off?
And now I've done some Googling
It looks like they're fake, but not necessarily bad:
http://www6.head-fi.org/forums/showthread.php?s=&threadid=11704
They look like this one, but thatperson is talking about a potentiometer, not an attenuator..
http://www.angela.com/catalog/potentiometers/Alps_Pots.html
Well, I guess I'll just try it, and compare, and then we'll see
It looks like they're fake, but not necessarily bad:
http://www6.head-fi.org/forums/showthread.php?s=&threadid=11704
They look like this one, but thatperson is talking about a potentiometer, not an attenuator..
http://www.angela.com/catalog/potentiometers/Alps_Pots.html
Well, I guess I'll just try it, and compare, and then we'll see
Hi,
I too used the blue alps form HK. They worked ok for a while, then started having various problems. On one of mine, one of the sides started dropping out the audio from about position 9:00 until 12:00
All four alp blues that I had purchased came from a Hong Kong ebay seller. All had intermitted popping sounds when changing volume. I finally solved that issued by taking the grid to ground with a 10k resister.
I have since replaced my blues with blacks and really like the sound.
Here is a picture of one blue and one black alps: A blue and black ALPS. Just click the NEXT button to see other pics.
Pardon my site, it is very much under construction and I have not added much text to pictures.
Hope this helps.
ck
I too used the blue alps form HK. They worked ok for a while, then started having various problems. On one of mine, one of the sides started dropping out the audio from about position 9:00 until 12:00
All four alp blues that I had purchased came from a Hong Kong ebay seller. All had intermitted popping sounds when changing volume. I finally solved that issued by taking the grid to ground with a 10k resister.
I have since replaced my blues with blacks and really like the sound.
Here is a picture of one blue and one black alps: A blue and black ALPS. Just click the NEXT button to see other pics.
Pardon my site, it is very much under construction and I have not added much text to pictures.
Hope this helps.
ck
Vishay Dale step attenuator from Taiwan
I bought two of them and I thought they are good. Very unfortunately, I found that the design of it is really BAD!!!!!!!!
First I had in installed in my line amp and it sound a little bright. Then, I tested them by feeding a 10kHz squarewave and measured the output with an oscilloscope. I noticed that there are very high spike appears at the rising and falling edges. This happens the worst at lower volume position.
After investigating it for sometimes, I found that the spikes were caused by coupling inside the switch itself.
I e-mailed the seller but he didn't give me any answer to the problem.
My advise is :- Don't buy those unless you see the test reports.
Johnny
I bought two of them and I thought they are good. Very unfortunately, I found that the design of it is really BAD!!!!!!!!
First I had in installed in my line amp and it sound a little bright. Then, I tested them by feeding a 10kHz squarewave and measured the output with an oscilloscope. I noticed that there are very high spike appears at the rising and falling edges. This happens the worst at lower volume position.
After investigating it for sometimes, I found that the spikes were caused by coupling inside the switch itself.
I e-mailed the seller but he didn't give me any answer to the problem.
My advise is :- Don't buy those unless you see the test reports.
Johnny
Erno Borbely at www.borbelyaudio.com still has some 40mm "Black Beauty: Alps for sale, in 10 and 100K. These discontinued units are very nice.
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