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emrr

newly built Gates SA-39B 'tribute' compressor/limiter
« on: April 19, 2016, 01:57:15 PM »
A modern variation on the Gates SA-39 limiter, built recently by David Pendrill of the UK (DaveP on GroupDIY), and tweaked a bit by myself.    I'm acting as his sales agent, as I have it here in the US. 

This is a completely hand-built tube audio limiter with point to point construction using modern parts.  DaveP even cut all the metalwork himself!  A fantastic looking build in my opinion, with a nice smaller 3RU footprint. 

I have owned, restored, and modified about ten of the original, and this sounds like it fits in the 'family of sounds' those units provide.  It’s currently taking  a test drive at Mitch Easter’s place Fidelitorium, and his immediate quote was it’s “killer”.

It has expanded attack, release, and threshold controls not available on an original which give a much wider color and control palate. 

It uses a 600 ohm T attenuator on the input, more like the early Gates SA-39's, and a six step output attenuator with 6 dB steps.   

The threshold control runs both above and below the original,
allowing you to overload the amplifier stage more greatly, or get a much softer/smushier sound with low thresholds.   

The release goes fast enough to get into distortion territory as well, several steps faster than an original. 

If you run lower threshold, slower attack, and moderate release, it begins to behave more like a Sta-Level type compressor.   

The noise floor is very low, as good as any real SA-39 I've ever measured. 

It differs from the original circuit in a few ways, having a different type output tube that provides a bit less overall power, and a different approach to the regulated tube power supply section.  This tube regulated PSU provides regulated DC to the entire amp, where the original only supplies regulated DC to the earlier stages.   The tube filaments are all DC as well. 

Here's a  link to discussion about the build.

$1995 plus shipping and insurance















« Last Edit: May 03, 2016, 11:35:21 AM by emrr »
Best,

Doug Williams
Electromagnetic Radiation Recorders

"I think this can be better. Some kind of control that's intuitive, not complicated like a single knob" - Crusty

"Back when everything sounded g


mylesgm

Re: newly built Gates SA-39B 'tribute' compressor/limiter
« Reply #1 on: April 22, 2016, 03:21:46 AM »
That is one beautiful build.
Check my work at www.mylesmumford.com

iprovlek

Re: newly built Gates SA-39B 'tribute' compressor/limiter
« Reply #2 on: April 22, 2016, 08:35:53 AM »
That is one beautiful build.


I agree... Man this looks awesome!
 ;D

Re: newly built Gates SA-39B 'tribute' compressor/limiter
« Reply #3 on: April 22, 2016, 10:15:09 AM »
beautiful!! Would want that on top of a rack. Show dem tooobs!  ;D

Whoops

Re: newly built Gates SA-39B 'tribute' compressor/limiter
« Reply #4 on: April 22, 2016, 09:05:49 PM »
Just Beautifull!!!!!

peskado

Re: newly built Gates SA-39B 'tribute' compressor/limiter
« Reply #5 on: April 23, 2016, 11:23:04 AM »
Amazing Build!!!

Re: newly built Gates SA-39B 'tribute' compressor/limiter
« Reply #6 on: April 24, 2016, 07:35:14 PM »
Wow!   Really nice. 

buildafriend

Re: newly built Gates SA-39B 'tribute' compressor/limiter
« Reply #7 on: April 24, 2016, 08:22:22 PM »
yeah that really is a work of art.

emrr

Re: newly built Gates SA-39B 'tribute' compressor/limiter
« Reply #8 on: July 19, 2016, 02:18:57 PM »
bump
Best,

Doug Williams
Electromagnetic Radiation Recorders

"I think this can be better. Some kind of control that's intuitive, not complicated like a single knob" - Crusty

"Back when everything sounded g

Druhms

Re: newly built Gates SA-39B 'tribute' compressor/limiter
« Reply #9 on: August 04, 2016, 11:31:57 AM »
Doug!....Awesome!  And a big kudos to your partner in crime!
I guess you got tired of resurrecting these  giant old beasts from the dead?   haha  It's probably easier to just build one from the ground up?
Saving my pennies, starting now.
JJ
www.BoogieTracks.com


emrr

Re: newly built Gates SA-39B 'tribute' compressor/limiter
« Reply #10 on: August 04, 2016, 05:20:31 PM »
Hey!  Long time!  Still resurrecting them, but market has changed so much and I don't sell on ebay anymore, all vintage gear sales are private network or forum listings these days.  DaveP does great work, with a twist on the classics. 
Best,

Doug Williams
Electromagnetic Radiation Recorders

"I think this can be better. Some kind of control that's intuitive, not complicated like a single knob" - Crusty

"Back when everything sounded g

Druhms

Re: newly built Gates SA-39B 'tribute' compressor/limiter
« Reply #11 on: August 10, 2016, 10:52:26 AM »
Hey Doug,

Are these new units built to order?  Or are you guys building a few to have on hand?  I believe this thing just jumped up my list.  Do these have enough gain for a Bass GTR Line In via transformer box?....or possibly an active DI box?

Thanks!
JJ
www.BoogieTracks.com
P.S.  Is this where you spend most of your gear techy time these days?  I haven't noticed many posts on other burnt out sites.  But then again,  I'm pretty burnt myself.  I'm just now getting on board in this place.....
P.S.S.  I sent a guy to you with an SA39.   Hope it works out!

emrr

Re: newly built Gates SA-39B 'tribute' compressor/limiter
« Reply #12 on: January 11, 2017, 09:59:06 AM »
They could be built to order.....I'm sure Dave would like to sell the first one first! 

Somewhat less gain than an original, but should be plenty for an active DI to drive.  Ratio and threshold are the same thing, so lower ratios buy you lower signal level requirements for compression.

Yeah, this is the best place to tech out that I know of, at least for studio gear. 

We've talked with the SA-39 guy, he may take it to Dave in France.
Best,

Doug Williams
Electromagnetic Radiation Recorders

"I think this can be better. Some kind of control that's intuitive, not complicated like a single knob" - Crusty

"Back when everything sounded g