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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: RE: Thinking outside (chassis #3) posted by Mike Mount on February 26, 2021 at 10:42:54:
Those are very impressive builds and I agree entirely about the value of a great power supply. I like the construction technique as well: very clean and sanitary. Who makes those extruded metal frames you use?
I have found that a typical commercial amp generally can not even come close to providing adequate current for transient musical events, in particular. Two very mundane examples are the popular Dynaco ST70 and SCA35. Both of these amplifiers have severely limited power supplies that are not just hot and noisy but entirely insufficient for providing the necessary current without compromise during loud passages.
For example, I measured the current at full output with both channels driven on a SCA35 to be 200mA with a 20V sag in B+. The power transformer is specified at 180mA! Installing a 250mA external supply with low impedance output totally transforms this amplifier from mid fi to hi fi!
I find that I only need a couple of power supplies for a multitude of potential topologies and tube types. I have one that is 550V @ 350mA and another at 500V @ 300mA. No electrolytic caps are used in either; I use Wima DC Link MKP4 and two very low resistance chokes at <25r @ 4 H each. The 550V is choke input only but the 500V is cap input and could be choke input for something like a PP EL84 or 2A3 SE amp to reduce the output voltage to 400V.
Here's the 550V @ 350mA supply:
Here's the 500V @ 300mA supply:
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Follow Ups
- RE: Thinking outside (chassis #3) - Palustris 11:59:56 02/26/21 (1)
- RE: I like your external HV P/S - Mike Mount 16:35:54 02/26/21 (0)
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