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In the Forum: Melquiades Amplifier
In the Thread: An ultimate transformer for narrow bandwidth?
Post Subject: Re: ...apply similar tactics to the power supply...Posted by cv on: 2/25/2005
Well, I have little comparative experience of this cos the required chokes get huge and expensive, but some people I trust swear by low DC resistance chokes; they feel that this parameter is so important that they will sacrifice inductance to achieve it. Ie nothing to do with the inductance or current handling, (at least, not directly). I heard a system which utilised low DCR chokes that had a very unstressed and "non-frenetic" (or is it unneurotic?) sounding bass - didn't draw attention to itself in a bad way.
As for giving each LF channel its own supply, yes, definitely worthwhile. Class A is only constant current in PP! In SE, the current draw will be anything but constant. The last thing you want is the bass channel demands modulating the supply rails on the MF and HF channels... and a low DCR for the power supply inductors will mean that the 6C33s have a more steady supply to draw on. Think of it as bringing some of the benefits of regulation without the baggage.
If it becomes impractical, you can run everything through 1 big choke first (with low DCR) and make sure each channel has some good filtering after that.
Some guys I know run separate supplies for each *tube*, no less... whether this is worth doing really depends on the circuit topology and type/loading scheme of the input tube...I suspect that with 2 stages and that little *** valve upfront, little will be gained.
cheers,
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