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In Reply to: RE: TU-882R Headphone Amp - Possible Mods posted by Mike C on April 12, 2016 at 17:18:23
Mike, C12 and C13 replacement is a no brainer. Just what to use? The Panasonics get huge respect, one person thinking that the ED is an equal to the BG. You, Nelson Pass, Michael Samra and others all like the Panasonics for the 350v cap. In Panasonic I see two different alternatives, the ED and the EE. I guess I'll try them both. Any notion of how big they can safely go up to from 22uf. Tweaker
I know very little about electrolytic caps as I rarely use them.
I've tried Black Gates in the past and I'm not convinced even though many people rave about them. From what people say, Panasonic are worth trying. As for ED or EE, check the data; 105 deg C is good, and you want minimum series resistance and maximum rated ripple current (the two tend to go together); also look them up on Tube DIY Asylum.
As for capacitance value ... I can't help as I have no experience of regulated supplies as used here, or of RC dropper stages. I do know that too much capacitance can be harmful; it can sometimes give a 'slow' sound and mess up leading edges. My unit has a fast, clean, engaging sound with fine clean leading edges so myself, I'm leaving the values as is.
My unit is very quiet so I see no need to increase the capacitance.
It's worth seeing what other people have done and try things out yourself carefully, just be aware more capacitance may not be an improvement.
Actually I think that the power in this circuit is not regulated. I believe that the fet is used as a ripple filter. Not exactly regulation, I'm pretty sure. I'm no expert but there are no regulators. Tweaker
Mike, My experience with SS power supplies is that more better. Improvement in bass speed, impact... I have a note to the designer as to how high it can go. The Panos are well loved, as stated before. Being in the more is often better camp a higher rated FET would be an all but certain improvement ,IMO. A little like a higher gauge power cord. I would replace the 2SK2750 with the highest current, wattage rated device that would operate the exact same as the 2750, in the same or similar TO-220 package. Can't pick this out myself, it's out of my league. Tweaker
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