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Summit TLA 100A noise
Old 9th October 2008
  #1
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1 Review written
🎧 15 years
Summit TLA 100A noise

Got one of these in to try on a vocal, is it generally really as noisy as the one I've got when I crank up the gain or have I got a duff one? I know it's tubes but it does seem a bit excessive.

Steve
Old 9th October 2008
  #2
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Fredo's Avatar
 
🎧 15 years
My maintenance engineer managed to reduce the distortion and noise by a substantional amount, simply by "tweaking" the power supply.
(self-noise down by 13 dB /Distortion (originally 0.1%) was brought down to 0.04%.)

These are "old design" machines and are very sensitive to that kind of stuff.

Fredo
Temple Of Tune
Belgium
Old 28th March 2009 | Show parent
  #3
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Agno's Avatar
 
🎧 15 years
I know this is an old thread, but how much of this rumor is true? Do the TLA-100a's have a tendency to be noisy?
Old 28th March 2009 | Show parent
  #4
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Fredo's Avatar
 
🎧 15 years
Quote:
Originally Posted by Agno ➡️
I know this is an old thread, but how much of this rumor is true? Do the TLA-100a's have a tendency to be noisy?
They are pretty noisy. But that's easily solved with a good preamp that has lots of output.

Fredo
Old 29th March 2009 | Show parent
  #5
Gear Addict
 
🎧 10 years
I recently picked up a used TLA100a from Gear Orphange. When I got it I immedialty replaced the stock tube (Ruby Tube) with a NOS Tele ECC803. It seemed to reduce the noise and open up the highs a little. However its still not where I want it to be with the noise level. Frustrating. I was hitting it hard with a SSL Xlogic Channel. I am going to try a JJ ECC803s tube to take the noise floor down a little more. Has anyone else here able to reduce to noise without making adjustments to the Power Supply or Power Transformer?
Old 30th March 2009 | Show parent
  #6
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Agno's Avatar
 
🎧 15 years
damn I totally don't want to get one now. Sounds like a headache.
Old 30th March 2009 | Show parent
  #7
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VIGUIER's Avatar
 
🎧 10 years
Hello !!

Mine has a little of noise too, I'll see my tech this week and he'll tell me from where it's come...

Paul
France
Old 15th November 2016
  #8
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1 Review written
🎧 5 years
Bumping this old thread 'cause i purchased a used TLA100a and clearly experience the noise issue.
Can anybody argument what 'tweaks' are needed to reduce the noise?
I have recapped the PSU section and swap the tube with a known low noise one but no improvements.
cheers,
g.
Old 15th November 2016 | Show parent
  #9
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Pred80r's Avatar
 
🎧 10 years
Summit Noise

I know the topography between the TLA and the DCL are slightly different but I did have noise in my DCL-200. We pulled it apart, tightened up the input and output XLR jacks as they moved when we plugged XLR's into them. Unfortunately we also swapped out the tubes for Sovteks at the same time so when we put it all back together and it was relatively clean (for tube gear) we just went with it.

In others words I cannot tell you if changing the tubes cleaned up the outputor Tightening the XLR jacks cleaned up the output and/or both.

I think with a little TLC you can remove noticable noise.
Old 17th November 2016
  #10
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t-hiho's Avatar
 
🎧 10 years
My TLA100A is also noisy as hell. And worse, it changes sometimes.
Tried to flip the tube, but without any improvement.
First thing would be to know noise figures, as they should be with that unit.
Has anybody a calibration manual or detailled technical datasheets for this? I only have the original manual, and there are some figures in it, but not everything. My repair specialist guy measured my unit, it shows a significantly different frequency response with gain reduction goin on. Many old compressors do this, but what we saw, seemed a little over the top...
Shall we do measurements and compare? Anybody from Summit out there?
Old 3 weeks ago | Show parent
  #11
Here for the gear
 
Quote:
Originally Posted by t-hiho ➡️
My TLA100A is also noisy as hell. And worse, it changes sometimes.
Tried to flip the tube, but without any improvement.
First thing would be to know noise figures, as they should be with that unit.
Has anybody a calibration manual or detailled technical datasheets for this? I only have the original manual, and there are some figures in it, but not everything. My repair specialist guy measured my unit, it shows a significantly different frequency response with gain reduction goin on. Many old compressors do this, but what we saw, seemed a little over the top...
Shall we do measurements and compare? Anybody from Summit out there?
Bumping this. I just got a TLA100 and it’s old to say the least. Was able to track it down to being from 1985 and also knowing it’s one of the units Dave Hill touched. Before I got it, was super excited since my buddy who is a very known producer has one and it’s his go to vox tracking comp. He also tells me he never goes past 5 on the gain. Once I set it up, and took it out of bypass with no gain up whatsoever and the noise floor easily jumped up 10-15db. I pushed my Jim Williams High Speed Mic pre and it seemed to help the louder I pushed the pre into the TLA. The only issue is that I felt like it was a compromise, even if I pushed gain up a pinch, I felt I was just masking the problem itself. Def frustrating, but going to reach out to Audio Upgrades to see if it’s something He can fix. The tube is a GE 12ax7 and also looked fairly new. Will post with end result.

Also, Summit Audio is now owned by a Electronics company in OC California
Old 3 weeks ago | Show parent
  #12
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t-hiho's Avatar
 
🎧 10 years
Quote:
Originally Posted by Mhelms714 ➡️
Also, Summit Audio is now owned by a Electronics company in OC California
Mine is still noisy. But it’s gotten better after trying different tubes. I was discussing that issue with Dave Hill himself and he was very nice and helpful.
Might also be that the 990 opamp is not fully up to specs any more after so many years. You can buy 990C as a replacement (with a slight change in circuitry). But so epeople think the old ones just sound better.
I bought a second unit after all, a newer one from the 90ies. It’s a lot quieter by design.
BTW, don’t forget: the unity gain position on a TLA100 is around the marking 3 on the gain knob! Ich you compare at 5, it seems ok to have like 10db more noise. Compare with LA2A - roughly the same phenomenon, afaik.
I talked to the great Al Schmitt and Steve Genewick a lot about their TLA100s at Capitol. Both told me that they could not hear any difference between an old one and a newer one. They have them even mixed up in the racks and don’t care about which one to use on which source. Regarding sound, I can totally agree with this. My two units also sound identically. Just the noise floor is a bit worse on my older 1st gen unit. I still think there is something more inside, that is not fully ok. Perhaps a full recap would help? I’ll try one day when I find the spare time. Till then I just keep using them. Plz keep us up to date about your findings! Those are surely great units and they deserve the effort of finding the best way to keep them up to spec! Many greetings, Toni
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