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Old 12th January 2006, 01:03 PM   #1
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Default Alps attenuators

I've been searching, but I can't find it anymore. Somewhere someone warned for Alps stepped attenuators, they would be fake, as Alps would never have made such things.

I bought one of those so my question is: have I been ripped off?

(I haven't had the chance to use them and hear for myself)
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Old 12th January 2006, 03:38 PM   #2
kmtang is offline kmtang  Canada
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I believe you bought them from E-bay. They are the one with axial leads resistors on it.

If they cost for $20 or less, surely they are fake ones.


Johnny
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Old 12th January 2006, 03:54 PM   #3
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The real stepped Alps, the RK50.
$800 retail in Europe, +3 months order time..

www3.alps.co.jp/WebObjects/catalog.woa/PDF/E/Potentiometer/MetalShaft/RK501/RK501.PDF
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File Type: jpg stepped alps.jpg (36.7 KB, 710 views)
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Old 12th January 2006, 04:10 PM   #4
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Default hows about this one?

Vishay Dale 23 Step Attenuator 100K 12ax7 Potentiometer
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Old 12th January 2006, 05:05 PM   #5
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I bought this item about 14 months ago. I thought it was very nice and a quality construction for $58+.

installed in a headphoone amp
Click the image to open in full size.
dr._sleep
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Old 12th January 2006, 05:29 PM   #6
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I have a pair of mono Alps stepped attenuators (33K),they came out of a Pioneer PA amp, so they certainly do make them.

Shoog
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Old 14th January 2006, 08:14 PM   #7
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And now I've done some Googling

It looks like they're fake, but not necessarily bad:

http://www6.head-fi.org/forums/showt...threadid=11704

They look like this one, but thatperson is talking about a potentiometer, not an attenuator..

http://www.angela.com/catalog/potent...Alps_Pots.html

Well, I guess I'll just try it, and compare, and then we'll see
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Old 14th January 2006, 08:59 PM   #8
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Like this :
http://cgi.ebay.com/Blue-Valvet-resi...QQcmdZViewItem
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Old 15th January 2006, 05:59 AM   #9
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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
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Old 15th January 2006, 03:23 PM   #10
kmtang is offline kmtang  Canada
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Default 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
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