[quote author="khstudio"]Do you have a schematic or the changes for the power supply you could send me or share?[/quote]
I used Fabio's PSU. I just scribbled on a printout, so I don't have the changes documented electronically, but it's quite simple. After the bridge rectifier (4 diodes), just leave of all the electronics for the negative rail. Then I just trimmed the 317 to 24VDC. And leave off all the 5V electronics as well.
[quote author="khstudio"]Also, I noticed in your parts list the 22-0-22 TX... are you just using one side?
AND - how does that effect the VA rating if you are?
I ask because I thought about using a 12-0-12 (series secondary) for 24 volts but I'm not sure how that effects the VA rating either???[/quote]
I used a 22-0-22 because I have a bunch of them in parts. And yes, I wired the secondaries in series and just used one "tap." Regarding VA, there's a wonderful explanation on how to calculate VA on the Avel Lindberg website. Each channel of 1272 draws 120mA or so when biased properly. I think I used 500mA for a 2 channel unit to account for additional LEDs and opamps. So 24V * 0.5A = 12VA. So a 15VA should do it for a 2 channel unit. I think I used a 25VA or 30VA, so all is well.
A 12-0-12 will work in series, but in this case, you're center tap won't be your reference, one of other leads will. This way you'll get the full 24Vac swing.
[quote author="khstudio"]BTW, How does your 1272 compare to other pres you have?... I've never heard a NEVE anything before & don't know what to expect.[/quote]
It's sound great... but very different from anything APIish. Expect a rich, creamy sound, but not a punchy buttom end. Based on what you've built, I think it will be a perfect compement to your APIs/PM-1000s.
