Re: Op Amp preamp for a single stage valve amp.
The opamp current is almost certainly low enough for you to steal it from the HT supply.
A conservatively rated WW resistor, 12 or 15 volt zener, a 470uF 25V electrolytic and a bit of stand off tagstrip will do nicely.
If the opamp has a dual rail supply, it gets a bit more involved but still not very.
Which Velleman kit are you using?
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