If you look carefully at Deep Surplus website, the remaining quantity is dwindling - epecially the low Vgs values. I would order a bunch of stuff left to keep for future projects if you want matched units with original (non-exteneded) pins.
I agree they are probably real as the low level of interest doesn't warrant fakes like NP mentioned. Mine sound really nice anyhow.
I see plenty of LU1014 in stock at Deep Surplus:
LU1014
Also, xrk ordered his LU's from China as well, so I wouldn't take the fact that yours look his as proof that they are genuine. Of course, they are a rather obscure part, so are probably not as high on the list of parts to counterfeit. So, the parts may well be genuine.
They don't appear to keep their website bang-up-to-date. Try to order a pair and you'll get:
I need them for a F3 where 250mA probably won't do the trick. (I've got a Bottlehead S.E.X. and a DIY Torpedo III underway for phones.)
Like JeffYoung said, he is looking to build a power amp for speakers, not headphones. Aside from that, many of us here in the Pass Labs forums believe simpler circuits sound better - even more so with headphones where the power requirements are so low. Integrated circuits like the LME are anything but simple. An amp using that chip likely measures better than the things we build and may sound pretty good. But, measurements aren't everything, and better sound can often be had using a few discrete parts in a simple circuit. At least for me, an amp using a chip just isn't my cup of tea.
IF lots of 2nd harmonics, input and output coupling caps, .... means good sound, then maybe something like this to try ??
(Not my circuit.)
Patrick
.
Might be ok for high efficiency speakers.
They were talking about headphones ?
Will surely drive this :
https://www.innerfidelity.com/conte...ealed-planar-magnetic-headphones-measurements
Patrick
Will surely drive this :
https://www.innerfidelity.com/conte...ealed-planar-magnetic-headphones-measurements
Patrick
Since there is such interest after all these years, I am posting some pdf
documents that you will find useful.
The LU1014D you probably have already, as well as the F3 owner's manual
which is also found at FIRST WATT - in particular, the performance curves
of a production unit.
The full schematic of an F3 channel you might not have, so here it is also.
Not previously seen is the measurement information for selecting the Jfets
and the data on a sampling of the actual parts tested for this amplifier,
along with the calibration curve for minimum distortion via choice of R5
against the Vgs results of the selection test.
documents that you will find useful.
The LU1014D you probably have already, as well as the F3 owner's manual
which is also found at FIRST WATT - in particular, the performance curves
of a production unit.
The full schematic of an F3 channel you might not have, so here it is also.
Not previously seen is the measurement information for selecting the Jfets
and the data on a sampling of the actual parts tested for this amplifier,
along with the calibration curve for minimum distortion via choice of R5
against the Vgs results of the selection test.