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Author Topic: Sontecs...  (Read 244215 times)

Gold

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Re: Sontecs...
« Reply #525 on: August 11, 2010, 05:46:14 PM »

TotalSonic wrote on Wed, 11 August 2010 16:03


Something is definitely wrong because I'm getting a noise floor of around -80dBFs



I can't take it. This drives me nuts. I'd leave it alone 'over there' but this is totally meaningless. You must use a reference standard that means something like dBu, dBV, dBv, VU(we know the common reference voltage).
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Paul Gold
www.saltmastering.com

On the silk road, looking for uranium.

24-96 Mastering

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Re: Sontecs...
« Reply #526 on: August 11, 2010, 05:58:49 PM »

For your reference, noise from my 250C:

complete chain in bypass: -97dBfs
only 250C switched in: -93 dBfs

For Paul's peace of mind: ADDA set to -15dBfs = +4dBu

PS: I recall there was a common problem with the 250Cs that gain pots could "turn noisy" over time. This should be so especially around unity position, IIRC.
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24-96 Mastering
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dietrich

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Re: Sontecs...
« Reply #527 on: August 11, 2010, 06:33:56 PM »

thanks Robin x2.

Seems correct the +4 change after  being warmed up when put into the signal.

24-96 Mastering

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Re: Sontecs...
« Reply #528 on: August 11, 2010, 07:00:12 PM »

hnewman wrote on Wed, 11 August 2010 14:49

Am in the process of having it's organs harvested and transferred to a new boxes with switches, will let you know how it works out.


That's very interesting. Are you doing it yourself or are you having it done?
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24-96 Mastering
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hnewman

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Re: Sontecs...
« Reply #529 on: August 11, 2010, 09:07:25 PM »

I think all the 250 series are unbalanced, I figured this out the hard way.   Regardless, I agree with Brad, something is wrong.  My 250ex is quite quiet as long as it's situated properly.

Having someone else switch in the switches, I lost my soldering privileges years ago, after "improving" a mid sixties silverface super reverb.

dietrich

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Re: Sontecs...
« Reply #530 on: August 12, 2010, 08:17:02 AM »

Gold wrote on[/quote




I can't take it. This drives me nuts. .



the 250c had 30% more noise than I would like it to. now it has 3% more noise that I like a unit in the chain to have...
that worse?

Matt_G

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Re: Sontecs...
« Reply #531 on: August 16, 2010, 08:40:16 AM »

hnewman wrote on Thu, 12 August 2010 11:07

I think all the 250 series are unbalanced, I figured this out the hard way.   Regardless, I agree with Brad, something is wrong.  My 250ex is quite quiet as long as it's situated properly.


I was surprised to find that my 432C was unbalanced on the input side even though it has XLR in & that it was wired for pin 3 positive! Didn't notice until I hooked up a set of API550M's which also have an unbalanced input, when I had them in series they cancelled each other out... The 432C is balanced out though.

Had mine all re-wired for pin 2+ now & it's all working swell with all my gear now. Though I sold my 550M's for a 5500.. which I personally preferred when I had them side by side.



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Matthew Gray Mastering

Brisbane Australia

Ruairi O'Flaherty

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Re: Sontecs...
« Reply #532 on: August 16, 2010, 09:35:13 AM »

hnewman wrote on Thu, 12 August 2010 11:07

I think all the 250 series are unbalanced, I figured this out the hard way.   Regardless, I agree with Brad, something is wrong.  My 250ex is quite quiet as long as it's situated properly.


The 250 schemos I've seen were differential in and unbalanced out.  The GML IIRC has differential in and an impedance balanced output.  

Cheers,
Ruairi

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TotalSonic

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Re: Sontecs...
« Reply #533 on: August 16, 2010, 10:56:45 AM »

Ruairi O'Flaherty wrote on Mon, 16 August 2010 09:35



The 250 schemos I've seen were differential in and unbalanced out.  



Yup - that's what's going on with my 250EX as well.

Best regards,
Steve Berson

Phil Demetro

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Re: Sontecs...
« Reply #534 on: August 16, 2010, 12:11:11 PM »

Matt_G wrote on Mon, 16 August 2010 08:40

 was surprised to find that my 432C was unbalanced on the input side even though it has XLR in & that it was wired for pin 3 positive!The 432C is balanced out though


Interesting. This is a first I've come across. Had someone been inside the unit doing repairs perhaps??
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Phil Demetro
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David Glasser

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Re: Sontecs...
« Reply #535 on: August 16, 2010, 01:43:41 PM »

No, that's the way they were designed and built.

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David Glasser
Airshow Mastering
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Laarsø

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Re: Sontecs...
« Reply #536 on: August 17, 2010, 01:55:43 AM »

Sontec's MES (Mastering Equalizer w/Switches) has balanced or unbalanced inputs (as ordered) and ordinarily unbalanced outputs.  This is a single-ended design.  If your studio doesn't need balanced signaling, you will be fine without it on the Sontec inputs.

Burgess had the HS-1000 tuned by ear at the Mastering Lab by Massenberg and Sax.   The result - a transistor eq with a tube sound.  

Sherwood's tube eq as I understand it also had no transformers.  

Burgess has extolled the Manley transformers as being "well shielded."

Firlotte has made a popular op amp replacement for the MES, however, he also like using iron in his "maidens."

Laars
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Space Camp Mastering

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"Lack of DSD post filtering fried a lot of expansive twitters." (D. L.)

Laarsø

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Re: Sontecs...
« Reply #537 on: August 17, 2010, 01:04:49 PM »

I heard that Sontec's MES has balanced or unbalanced inputs (as ordered) and ordinarily unbalanced outputs.  This is a single-ended design.  If your studio doesn't need balanced signaling, you will be fine without it on the Sontec inputs.


The HS-1000 was tuned by ear at the Mastering Lab by Massenberg and Sax.   The result - a transistor eq with a tube sound.  

Sherwood's tube eq as I understand it also had no transformers.  

Firlotte has made a popular op amp replacement for the MES, however, he also I think likes using iron in his "maidens."



Laars
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Space Camp Mastering

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"Lack of DSD post filtering fried a lot of expansive twitters." (D. L.)

dietrich

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Re: Sontecs...
« Reply #538 on: August 17, 2010, 07:49:07 PM »

whats the consensus of hs1000 vs firlotte op?

Wook

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Re: Sontecs...
« Reply #539 on: August 17, 2010, 08:49:35 PM »

The Mastering Lab EQ has always been using solid state amp designed by Sherwood Sax from its start. We are using own transformer-less tube electronics but not on the EQ. And our EQ has nothing to do with Sontecs.

Sunny
The Mastering Lab.
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