Stepped attenuators...

earwaxxer · 2299

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Offline earwaxxer

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on: September 22, 2013, 03:45:31 PM
Ok, crap, sorry... I cant remember where you guys mentioned that site where (prob China) where you can get super cheap stepped attenuators ala Goldpoint. Sorry I know such knowledge is sacrosanct. I'm a cheap bastard.

Eric
Emotiva XPA-2, Magnepan MMG (mod), Quickie (mod), JRiver, Wyrd4sound uLink, Schiit Gungnir, JPS Digital power cord, MIT power cord, JPS Labs ultraconductor wire throughout, HSU sub. powered by Crown.


Offline corndog71

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Reply #1 on: September 22, 2013, 04:32:38 PM
Here's one for $55 shipped.  Scroll down the page.

http://www.tubes4hifi.com/bob.htm

(https://forum.bottlehead.com/proxy.php?request=http%3A%2F%2Fi9.photobucket.com%2Falbums%2Fa78%2FBob01605%2Fnewsteppedattenuator.jpg&hash=bfef1fe59a8b8000550e5edc13494b8d09d30dfc)
« Last Edit: September 22, 2013, 04:37:29 PM by corndog71 »

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Offline earwaxxer

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Reply #2 on: September 22, 2013, 04:35:57 PM
sorry - I guess I need to add more info - I'm looking for the mechanism so I can put my own resistors in. Kind of like the Goldpoint but not $110 a pop. - thanks much!....

Eric
Emotiva XPA-2, Magnepan MMG (mod), Quickie (mod), JRiver, Wyrd4sound uLink, Schiit Gungnir, JPS Digital power cord, MIT power cord, JPS Labs ultraconductor wire throughout, HSU sub. powered by Crown.


Offline earwaxxer

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Reply #3 on: September 22, 2013, 04:37:27 PM
I cant believe I didnt bookmark it to begin with! - sorry again!...

Eric
Emotiva XPA-2, Magnepan MMG (mod), Quickie (mod), JRiver, Wyrd4sound uLink, Schiit Gungnir, JPS Digital power cord, MIT power cord, JPS Labs ultraconductor wire throughout, HSU sub. powered by Crown.


Offline corndog71

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Reply #4 on: September 22, 2013, 04:39:31 PM
Picky picky.

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Rob


Offline Paul Birkeland

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Reply #5 on: September 22, 2013, 04:44:27 PM
sorry - I guess I need to add more info - I'm looking for the mechanism so I can put my own resistors in. Kind of like the Goldpoint but not $110 a pop. - thanks much!....

Be really careful, there are plenty of switches out there that "look" like they should work, but are non-shorting switches.

For what the high end pots cost, the Goldpoint switch is very fairly priced.

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man


Offline earwaxxer

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Reply #6 on: September 22, 2013, 04:47:25 PM
Ok, Granger, fair enough.

Eric
Emotiva XPA-2, Magnepan MMG (mod), Quickie (mod), JRiver, Wyrd4sound uLink, Schiit Gungnir, JPS Digital power cord, MIT power cord, JPS Labs ultraconductor wire throughout, HSU sub. powered by Crown.


Offline earwaxxer

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Reply #7 on: September 22, 2013, 04:51:43 PM
I was hoping to outfit a stepped attn. with some Tants for about $100 pops.

Eric
Emotiva XPA-2, Magnepan MMG (mod), Quickie (mod), JRiver, Wyrd4sound uLink, Schiit Gungnir, JPS Digital power cord, MIT power cord, JPS Labs ultraconductor wire throughout, HSU sub. powered by Crown.


Offline Paul Birkeland

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Reply #8 on: September 22, 2013, 04:58:56 PM
It's reasonable to assume 23 resistors per channel for a simple series string attenuator, or 46 resistors.  The cheapest tantalum resistors I see are $3.45 (though you'll spend more to get the values you need in different wattages), so that's up to $160 for resistors. 

It'd be a shame to spend that kind of dough on botique resistors to then cut them to fit your cheap Chinese eBay switch, which may or may not meet your expectations.


Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man


Offline 2wo

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Reply #9 on: September 22, 2013, 05:38:52 PM
You know when he puts it that way ;D...John

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Offline saildoctor

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Reply #10 on: September 22, 2013, 05:43:49 PM
FWIW - I used the 2-deck 24 step version of these to make some attenuators for my FPIII:  http://www.partsconnexion.com/controls_rotary_connex.html

I bought 2 of them and just used one deck of each so that I could still get dual mono.  They seem to still work the same after about a year and a half.  I did use RN55's for the resistors and it was at least a small step up from what I had been using before. 
« Last Edit: September 22, 2013, 05:52:23 PM by saildoctor »

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Offline Paul Birkeland

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Reply #11 on: September 22, 2013, 07:35:11 PM

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man