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In the Forum: Audio Discussions
In the Thread: Initial thoughts about new/old Lamm ML2s
Post Subject: Only if you have specific complains…Posted by Romy the Cat on: 10/3/2008
It does not sound right to me. If I am not mistaken then it has 2 X2uF caps. What 10uF coupling cap can do there and what 1000V cap does in ML2. The 1000V cap is almost $6 more expensive – Lamm would kill himself but would never allow such a waste of capital! The PS of ML2 even with delay develop such a high voltage and it shell be used smaller voltage copping caps. Let see, the first stage has on plate probably 150V with second stage has on grid a few volts – 400V cap will do there perfectly fine. The second stage has I think 150V-200V on plate and the last stage has up to minus 100V on grid. The 400-600V cap will do there just fine, if the stages are capacitance coupled. Then the caps. The selection of 935 is kind of strange. The 935 are Metallized Polypropylene. They have higher volume and inferior sound. The Polypropylene Foil 950 are way better but at this voltage they have max nominal of 2uF (it is what Lamm used before. I do not know what he changed. He might change the loading impedance of the first stage that forced him to go for higher coupling capacitance. It is not difficult to trace and to measure it and to circulate the filter that the cap will form. Stay with 5Hz or lower. I would stay with Electrocube 950, Multicap RTX or those new Teflon V-caps. I do not like to bypass them if a good cap used to begin with (Multicaps are self-bypassed). If I were you then I nether would worry about ESR of the electrolytics nor about anything else in ML2. Whatever is made in there is sufficient enough to leave it alone. Still, I would touch anything only if you have the specific complains to the way how the amps sounds. Rerurn to Romy the Cat's Site