Mark Levinson 33H

[montana]

If you look beneath the levinson
There are screws that goes inside out
You should unscrew them
Secondly you should remove the screw that are inside the heatsink and than you can remove the heatsink
Good luck
If it never serviced I strongly recommend that you recap it
And if you wish to take it one step further replace all the diode bridges
It's will be far better power amplifier

 

[renjy651]

MONTANA

HERE IS THE ML-33H OVERHAUL USING WORLDS BEST PARTS SINCE HARMAN NOT ORDERING ANY NEW PARTS FOR POWER SUPPLY CAPS.
8 FILTER CAPS MADE BY CORNELL DUBILIER 60000uF 75V
4 REGULATOR CAPS 1900uF 250V
24 ULTRA LOW ESR HIGH RIPPLE 330uF 100V MADE BY CDE 301R331U100JE2 WORLDS MOST EXPENSIVE RADIAL CAPS.$19 EACH. (INCREASING TO 1500uF NOT RECOMMENDED.
36 CAPS ARE YOUR POWER SUPPLY.
ALL PARTS ARE CORNELL DUBILIER AND FEW UNITED CHEMICON ALL MADE IN USA NO CHINA PARTS. ALSO 6 NEW SURGE RESISTORS.
AFTER ALL THESE PARTS 33H WILL SOUND THE BEST LIKE NEW SINCE THE PWER SUPPLY CAPS IS OVER 30 YEARS OLD.
THESE PARTS WERE USED IN (3) ML-33H MONO BLOCKS.



THE UPDATE ACCORDING TO ML SERVICE CENTER.3CAP,TH,ELEC,ALUM,10uF,50V,20%,RAD,85C

2000 Hrs , Lead Spacing 2.5mm, D 5mm, H 12.5mm	Nichicon
8​	CAP,TH,ELEC,ALUM,68uF,63V,20%,RAD,105C	5000 Hrs @ 105°C, Lead Spacing 5.00mm, Diam 10mm, H 17.5mm (360mArms/105℃,100kH)	United Chemicon
5​	CAP,TH,ELEC,ALUM,100uF,25V,20%,RAD,105C	Low impedance 3000 Hrs, 6.3 x 11mm
1​	CAP,TH,ELEC,ALUM,680uF,6.3V,20%,RAD,105C	2000 Hrs Lead Spacing 3.50mm, Diam 8.00mm, Height 15.00mm
4​	CAP,TH,ELEC,ALUM,10000uF,6.3V,10%,AXIAL,85C	custom part Ripple@120Hz: 1.748 Amps @ 85°C
1​	CAP,TH,ELEC,ALUM,2200uF,35V,20%,RAD,105C	2000 Hrs Lead Spacing 7.50mm, Diam 16.00mm, Height 26.5mm
1​	CAP,TH,ELEC,ALUM,4700uF,35V,20%,RAD,85C	2000 Hrs, Lead Spacing 10mm, D 20mm, H 33mm
6​	CAP,TH,ELEC,ALUM,470uF,10V,10%,RAD,85C	2000 Hrs 6.3 x 11, IR 120 Hz/85 °C 366(mA)
8​	CAP,TH,ELEC,ALUM,22uF,35V,20%,RAD,85C	2000 Hrs Lead Spacing 2mm, Diam 5.00mm, Height 12.5mm
12​	CAP,TH,ELEC,ALUM,330uF,100V,-10/+100%,RAD.105C	customer to supply CDE part
1​	CAP,TH,ELEC,ALUM,680uF,60V,-10/+100%,RAD,105C	5000 Hrs @ 105°C IRMS (20kHz/85°C): 6.16 A	United Chemicon
4​	CAP,TH,ELEC,ALUM,22uF,100V,20%,RAD,105C	3000 Hrs 8 x 11.5 mm, mArms/105c,100kHz 282	United Chemicon

 

[montana]

I'm glad for you that you got everything that you need for the levinsons
We see things totaly different
Cornell dubilier is a good capacitor but my epcos has better specs mainly ESR which is the most important value of a capacitor
If you would bought my capacitors.. you would got free points that are critical to improve is those old beasts
Further more increase the capacity in a specific points helps a lot by its effortless ability of this amp.

 

[renjy651]

Montana

These parts were used for my customers.
Anyway did you replace the big filter caps 60000uF 75V and regulator caps? EPCOS DONT MAKE THOSE BIG CAPS. You think Mark Levinson use a 1500uF EPCOS?
ONLY WAY TO FIND WHICH ONE SOUNDS BETTER WE HAVE TO DO A TEST MY CUSTOMERS LEVISON VERSUS YOUR ML 33H.

 

[montana]

I did already those tests over my mono blocks and comparing one to the other