George, if you look further down on the Douk page of the device, in the specification section, it states that the Alps 27 pot is 50K ohms. I have not taken mine apart, which would be easy, but I am telling you, it sounds quite invisible.
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It all over the place, they say 50k input but don’t say which one, which means a 50k pot. Could be the cheap 24mm they have, as you can’t see the value on it. But the pic if you zoom on the Alps (Blue Velvet) says 100kohm A taper (log) pot and it would be a 100kohm input impedance. Whatever it is (50k or 100k), 10kohm is the best value to have, as all decent sources can handle 10kohm load (save for a couple of silly tube output ones) A 10kohm pot has "at worse" 2.5kohm output impedance which is fine for any poweramp with >33kohm or higher input impedance. Would be nice if you open it and find an Alps 10kohm A-taper (log) Blue Velvet for $40 with box and decent rca’s and free shipping. Cheers George |
George, picture is just a picture. Did you know that Alps never referred to the control as a Blue Velvet. Nowhere on their web site have I found it. If you could find it, please post it. I believe some audiophile engineer, in using it, gave it that name. I am sorry Georgi, but this device is an EXCELLENT passive unit, for cheap, according to my ears, and the dozen or more power amplifiers I have tried with it. The control has a sexy, very high end feel, and the little box is non resonant, and built really well. Enjoy ! MrD. |
There is the even better, the Alps "Back Beauty", but they cost a lot more.
https://i.ebayimg.com/images/g/O1kAAOSwQolbFS19/s-l300.jpg https://www.picclickimg.com/00/s/MTA3MVgxNjAw/z/W~QAAOSwYGFUv3Ah/$/1pcs-ALPS-RK40-50KA-Black-Beauty-... https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcSrMqGsGmwCWfSPDB1Y9O6LrTsKEfybIOqvEkwLGaCSU4Li... I am sorry Georgi, but this device is an EXCELLENT passive unitAs for the sound, I don’t doubt you like it,. and what you get is a bargain, I’m just pointing out the confusion of their ad in what actual value Blue Velvet is used and you get, all values will work as I pointed out, some better than others, because of proper >1:10 impedance matching input and output. We just have to wait for someone to have a look at what’s inside them. Cheers George |
George, I am sure you meant Black. Do those pictures say Black Beauty anywhere ? I cannot find it. I know about the Black bodied attenuators that Alps made, but they are no longer made, as the " Blue " does the trick. A buddy of mine purchased 4 of them, based on my recommendation of trying one, and he is using 2 per system, 1 for Left and one for right ( single channel only of the passive ), and tells me he hears an improvement in sq vs. using one. I have not been over to hear it, as he is out of state of my location, but, George, what do you think ? |
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