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which diamond buffer to build for pimeta? - Page 5

post #61 of 62
3/11/10 at 10:49pm
2N5486 you'll need, but any with similar Idss will work.
2N5087/2N5088 can be replaced with BC327/BC337 and MJE243/MJE253 with BD139/BD140, but remember different pinout.

The PPAv2 actually has basically the same buffer as the one I just linked.
As for parts, they should all available from one common distributor, such as Newark.
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post #62 of 62
3/11/10 at 11:11pm
[QUOTE=Spacehead;6469608
R4 and R7 ratio is 2X , mine is now 1.42X
I don't know if want to bother with that, I don't have 2 ohm resistors and there isn't room for two, except underside.

These sound good and they are almost identical, transistors are matched.[/QUOTE]
Oh I fixed that, added 4.7 ohm parallel with 3.3 ohm, got 2.35 ohm which is exactly 1:2 of 4.7 ohm.
That fixed the strength of this buffer, now there is no distortions in bass even at higher volumes. Sounds better than single BD139.

Little silly that I have biased my op amp so hard, that it gets warm to touch. But no worries, I have a fan directed towards my amplifier. Now listening to AD8066 which is excellent op amp. Smooth strong bass with almost BB-style "lazyness" with accurate AD soundstage imaging.

My source , Sound Blaster X-FI is now the worst component... I need to start from a cheap usb dac, like BantamDAC.

Edit: Damn, just played 20 Hz test signal. I heard that finally. It was distortion free, but some kind of sound of air...
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