Nelson Pass Aleph J

[marantzfan]

Just to clarify, I’m doing a classic build, not the redux.

F5M

The original F5 amplifier was a commercial product made by First Watt in 2008, and like other FW projects, in a limited quantity. As with most First Watt amplifiers, the ever generous Nelson Pass released the design after the retirement of the commercial product. Happy DIYers have been building...

diyaudiostore.com

 

[Tables_and_Tubes]

I have nearly all of the parts to build five or six Pass DIY amps. F5, F5m (classic with linear P.S. and chassis), Aleph J, F4, M2X. I have two of the special Pass DIY chassis that Modushop in Italy made. And all of the power supply related parts except for a few transformers as Antek is nearly always out of the popular 18v doughnuts.

What I am missing is time. That is why I built both of the Redux kits, ACA and F5M. They go together in just a couple evenings.I am slowly working on ramping up my "project time" . Only have about twenty, or so on the docket. I just love building stuff!

Dan

 

[asilker]

The F5M Redux kit will be coming my way this winter for sure. They’ll be used to drive the tweeters (front and rear) in my dipole OB speakers. I’m currently driving them with the ACA Mini I built a couple years ago. I need a new soldering project!

Would be interested to hear your impressions of the F5M VS low power tube stage.

Tangential, but this week I have been wondering:
- IF spatial cues are related to harmonic content
- THEN DSP crossovers might reduce that spatial distortion effect because they cut the lower freq and therefore my high freq drivers do not get fed harmonics from the fundamental directed to the mid freq woofer
- THEN passive XO's may offer an unusual benefit because you get harmonic content from the full range

EX/ if I cross a 2-way over at 1000hz with DSP, then my tweeter sees 1k hz and harmonics up from there (2k /3k/ 4k / etc)

But if I feed a full range signal through an amp which generates harmonic content, then feed it to a passive XO crossed at 1k, then my HF driver is fed the 2nd harmonic from that 500hz wave that's fed to the woofer

I dunno. I feel like either this is pretty clever or I'm a real dumbass. (or pretty clever AND Im a dumbass?)