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Levinson 33H buzzing on standby

Hi All,
I just noticed that my pair of Levinson 33H emits a buzzing sound from the tweeter when it is on Standby (blinking red).

When the amps are turned on, the buzzing sound goes away and is replaced with a slight hissing sound.

When I connect the speakers to my Levinson 433, there is no buzzing...so I'm guessing its not my power/equipment that is causing the problem.

I took the amps into my local service shop and they are telling me that its "normal" behaviour.

Does anyone (perhaps someone with 33Hs) confirm this is normal?

Thanks, Ray
raysam
splaskin
170 posts
 
Missioncoonery,

Were your 33H amps made at the old or new factory. Just curious. It's too bad that the present Levinson doesn't stand behind the equipment like the former group did.
renjy651
74 posts
 
Levinson 33H amp uses phillips capacitors. Also these inferior phillips capacitors were used in 331/332/333/334/335/336.

Levinson 33H uses four filter capacitors at 60000uf at 100V and two regulator capacitors at 1900uf/150V. When these phillips caps go bad you will get buzzing,distortion and amp shutting down etc. I recommend replacing these filter caps with cornell dubilier cap at 76000uf/100V. Three inches in diameter and 5.8 inches long. For regulator caps at 1900uf/250V. 1.39 inches in diameter and 4 inches long. You will hear a huge improvement in sound. And using a higher value filter capacitor helps the cap to run cooler.
renjy651
74 posts
 
Just for the record the original Levinson 33H Filter Capcitors were made by Philips part# 3186FH603U075DPA2. 60000uf/75V.(2.5 inches in diameter and 5.6 inches long)
Cornell dubilier makes these caps at 2.5 inches in diameter. I recommend either 62000uf/75V also 68000uf/75V both very expensive since these caps are 2.5 inches in diameter.
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