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RE: Garg0yle 2A3 DC

Thirteen henries is moderately low for a 2.5K transformer; that can give you perceptibly weak bass, especially at high levels. The Hammond 125ESE is spec'd at 10 henries. I like to go for 20 henries at 2500 ohms; beyond that you get big transformers with questionable treble - in my experience at least.

I totally agree that better power supplies make better music. A shunt regulator for this amp would be a beautiful thing. But in series feed you need ore current through the shunt reg than through the amp itself, so the regulator will dissipate at least 30 watts - no longer a simple, inexpensive project!

Incidentally, I did not design this for parallel feed even though I personally prefer it. A lot of people seem uncomfortable with it. But it does provide a good measure of power supply isolation.

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