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December 12, 2019, 06:07:41 AM

Author Topic: sex 3.0 stepped attenuator question  (Read 212 times)

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Offline Thermioniclife

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sex 3.0 stepped attenuator question
« on: December 04, 2019, 04:47:26 AM »
Hey folks,
Can any of your stepped attenuator kits be adapted to work on a SEX 3.0?
Thanks.
Lee R.

Online Paul Birkeland

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Re: sex 3.0 stepped attenuator question
« Reply #1 on: December 04, 2019, 05:03:46 AM »
Hello Lee,

The chassis plate of the S3X is just not quite large enough to make it a practical installation.  I think even a PEC pot is a bit of a tight fit, but a workable substitution.

-PB
Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline Thermioniclife

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Re: sex 3.0 stepped attenuator question
« Reply #2 on: December 04, 2019, 06:47:39 AM »
Thanks Paul,
I just ordered a Sex 3.0 and C4s during the last sale and have plenty of time to come up with wacky ideas while waiting for their arrival.
Best wishes for the Holidays and the upcoming new year.
Lee
Lee R.

Offline Natural Sound

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Re: sex 3.0 stepped attenuator question
« Reply #3 on: December 05, 2019, 04:13:59 PM »
Bottlehead used to sell a passive preamp. I forget what they called it. Basically it was a stepped attenuator with a multi input switch in an outboard enclosure. Unfortunately it has been discontinued.

There are several companies that sell them online. One company in Poland gets good reviews. https://www.khozmo.com/stereo_selector.html

Some creative bottlehead kit builders have shoehorned this https://glass-ware.stores.yahoo.net/a3mini.html into the S.E.X. 2.1. Not sure if it will fit in the 3.0. It will require some careful drilling. But might be worth it depending on your skill/comfort level.

I hope this helps stimulate you "wacky" ideas.😉



Online Tom-s

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Re: sex 3.0 stepped attenuator question
« Reply #4 on: December 05, 2019, 08:23:49 PM »
I ordered S3X and Mainline at the same time to try the exact same thing.
With the shunt attenuator from the Mainline i got the size of it for S3X.
Unfortunately it wouldn't fit. So i went with smaller Elma switches to make it work.

https://ep1.pinkbike.org/p5pb16519342/p5pb16519342.jpg
https://ep1.pinkbike.org/p5pb16521276/p5pb16521276.jpg

Offline Thermioniclife

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Re: sex 3.0 stepped attenuator question
« Reply #5 on: December 06, 2019, 04:58:45 AM »
I was thinking that I could mount a Twoquiet attenuator on the front panel of the wooden base.
The amp is going to reside on a shelf above my bench in my evil laboratory, so having the switches on the front would be ideal.
I guess my next questions are 1) what is the width of the Twoquiet trim bezel? and 2) will the resistors included in that kit be suitable to use in the S3X?
As far as mounting on the wooden base I have a lathe, a milling machine and a router so I can pretty much make or modify any parts that may be needed.
Thanks
Lee R.

Offline Thermioniclife

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Re: sex 3.0 stepped attenuator question
« Reply #6 on: December 06, 2019, 05:16:43 AM »
Oops,
I meant what is the width of the metal backing plate on the Twoqiuet kit or Mourquiet or Beequiet.
I can remove the input select portion of the trim bezel.
Lee R.

Online Paul Birkeland

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Re: sex 3.0 stepped attenuator question
« Reply #7 on: December 06, 2019, 05:44:22 AM »
The attenuator plate is 6" wide, so there's certainly room on the wood base for it. 

It will be a serious headache to build like that though!
Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline Thermioniclife

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Re: sex 3.0 stepped attenuator question
« Reply #8 on: December 06, 2019, 05:55:09 AM »
Thanks PB,
How about the resistor values, will any of these kits have appropriate values?
Lee R.

Online Paul Birkeland

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Re: sex 3.0 stepped attenuator question
« Reply #9 on: December 06, 2019, 06:08:52 AM »
Yes, you would want the BeeQuiet.

IMO your best bet would be to mount the metal attenuator plate on l-brackets that connect it to the top chassis plate, then just have holes drilled in the chassis for the shafts to poke through.  Luckily for you the shafts on those switches we provide are quite long!

That will make the amp a bit easier to take apart and much easier to build.

-PB
Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline Thermioniclife

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Re: sex 3.0 stepped attenuator question
« Reply #10 on: December 06, 2019, 08:14:36 AM »
Thanks Paul.
Lee R.

Online Tom-s

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Re: sex 3.0 stepped attenuator question
« Reply #11 on: December 06, 2019, 09:52:15 AM »
What you could do. Is turn the CCS 180 degrees, so it points just the other way (not upside down).
This would make enough room in the front for your attenuator.

I've also used a 50kohm input impedance in mine with good effect.

Offline Thermioniclife

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Re: sex 3.0 stepped attenuator question
« Reply #12 on: December 06, 2019, 10:30:04 AM »
Thanks Tom-s noted.
Lee R.

Offline oguinn

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Re: sex 3.0 stepped attenuator question
« Reply #13 on: December 06, 2019, 12:02:27 PM »
Are there resistor value differences between what the Submissive has and what’s on the stepped attenuator upgrade kits? It’d be awesome to replicate the Submissive for projects like this
Jameson O’Guinn

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Main System: Schiit Bifrost MB, U-Turn Orbit, Reduction w/ Integration, Smash w/ Smashup & SmashQuiet (replacing w/ BeePre), Stereomour II w/ DC Filament & Shunt Regulator (replacing w/ Kaiju), SEX 3.0 w/ C4S, Blumenstein Orcas, HD6XX

Desktop System: Crack with Speedball

Online Paul Birkeland

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Re: sex 3.0 stepped attenuator question
« Reply #14 on: December 06, 2019, 12:09:40 PM »
Yes, the Submissive used the attenuator setup that's in the Mainline, which is a lower impedance design than the attenuator upgrade kits for the BeePre, Stereomour, and Smash.
Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man