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Mark Levinson Sound that Speaks for Itself

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  #1  
Old 01-16-2019, 12:30 PM
Old School Old School is offline
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After looking for a nice Mark Levinson number 30.6, I have finally found one. It completes my Levinson reference front end. It replaced my 360S. It was an awesome upgrade. I never knew that bass could be so detailed!

My system consist of:
No 32
No31.5
No 30.6
No 336
B&W 800 Diamonds

My question is, the power supply of the number 30.6 has a low frequency hum to it. I have tried changing outlets. I moved my cables around some. There is no sound from my speakers with the system on, dead quiet. Any other ideas to try to get rid of this hum? I can't hear it when the music is playing. But when my listening room is quiet I can hear it......

I love the mark Levinson 300 series!
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Mark Levinson No 32 No 336. No 30.6. No 31.5 B&W 800 Diamond

Last edited by Old School; 01-16-2019 at 12:33 PM.
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  #2  
Old 01-16-2019, 05:43 PM
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Old School, direct your question to Ivan aka Masterlu. He may be able to help you.
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  #3  
Old 01-19-2019, 07:00 PM
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Quote:
Originally Posted by Old School View Post
After looking for a nice Mark Levinson number 30.6, I have finally found one. It completes my Levinson reference front end. It replaced my 360S. It was an awesome upgrade. I never knew that bass could be so detailed!

My system consist of:
No 32
No31.5
No 30.6
No 336
B&W 800 Diamonds

My question is, the power supply of the number 30.6 has a low frequency hum to it. I have tried changing outlets. I moved my cables around some. There is no sound from my speakers with the system on, dead quiet. Any other ideas to try to get rid of this hum? I can't hear it when the music is playing. But when my listening room is quiet I can hear it......

I love the mark Levinson 300 series!
That sounds like a transformer. This is a mechanical hum induced by some sort of resonance between wires or the core.
A very common problem especially if gets older and the resin (if used)!dries up.
Often the hum varies over time as a DC component present on your mains line can influence it.
This could be a tricky one to solve, as this kind of hum is stubborn.

A wooden cabinet can amplify this as well
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Old 01-19-2019, 07:29 PM
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I checked the pls-330 supply on the web.
Indeed two fairly large toroidal transformers are used for the left and right analog power supplies.
If you know what you are doing and use great caution (I don't want fellow forum members to die because of my instructions) you could lift the cover and very carefully run the unit while the power supply is open.
If that made it louder you could investigate isolating the cover with some dampening sheets.
Also if you put some controlled pressure on the transformer it can become less or more.
By all means if you are not comfortable ask a service guy to invest the root cause.

Good luck
Peter
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Old 01-20-2019, 09:51 AM
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Indeed, may be as simple as a slight tightening of the bolts that hold the xformers in place. Ask ML. The one time I contacted ML thru their website in the past several months they did respond to the question (asking about their support for vintage ML like yours - the answer was yes), albeit, took about 10 days.

BTW - great system with a great R2R ladder DAC. Many folks are starting to 'look back' at this older technology for their 'preferred' sound. Please post a pic or two of your system for our edification.
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Audeze LCD-3 Canton Ref 9K Clearaudio SM Pro Denon DP-80 w/Lyra Kleos, Ortofon Cdza Blk & K-b, AT33R & AT150Ti Kenwood L-07M mono-blocks Mark Levinson No. 383 Oppo 203 Parasound JC3 jr PS Audio Ultimate Outlet Sony ST-J75 Stax UA-7/CF SurgeX XR-315 Woo WA6 Gen 1 WW Eclipse 8/7 Pt, Au, Ag, Mini(x2), Starlight & Nano Yamaha T-2

Last edited by Formerly YB-2; 01-20-2019 at 09:57 AM.
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Old 01-20-2019, 10:38 PM
Old School Old School is offline
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Quote:
Originally Posted by Formerly YB-2 View Post
Indeed, may be as simple as a slight tightening of the bolts that hold the xformers in place. Ask ML. The one time I contacted ML thru their website in the past several months they did respond to the question (asking about their support for vintage ML like yours - the answer was yes), albeit, took about 10 days.

BTW - great system with a great R2R ladder DAC. Many folks are starting to 'look back' at this older technology for their 'preferred' sound. Please post a pic or two of your system for our edification.
That was it! I tightened the transformer down on the power supply, no more hum. It was actually quite loose....

I would love to add a photo of the system but I don't know how.......
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Mark Levinson No 32 No 336. No 30.6. No 31.5 B&W 800 Diamond
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Old 01-20-2019, 10:53 PM
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Great!! Glad it worked for you.
Think you have to become a 'subscriber' in order to post pic's.
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Glenn...
Audeze LCD-3 Canton Ref 9K Clearaudio SM Pro Denon DP-80 w/Lyra Kleos, Ortofon Cdza Blk & K-b, AT33R & AT150Ti Kenwood L-07M mono-blocks Mark Levinson No. 383 Oppo 203 Parasound JC3 jr PS Audio Ultimate Outlet Sony ST-J75 Stax UA-7/CF SurgeX XR-315 Woo WA6 Gen 1 WW Eclipse 8/7 Pt, Au, Ag, Mini(x2), Starlight & Nano Yamaha T-2
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