The ones I used (CBB60, 250 VAC) don’t have threaded mounting studs, but there are others that do.
What's on Deck..
I have PCBs already waiting for some parts to arrive from Mouser. This is the version of the F6 that I originally built to make the most of higher voltage rails & higher bias current supported by the FQH44N10 Mosfets. The Diamond buffer is a minor variation of the Austin input stage that Mark J. designed for the M2x. It became my favorite and remains in semi-permanent installation in my M2x. The Toshiba TTC004B and TTA004B bipolars are able to withstand higher voltage and power dissipation than the ZTX parts used originally. This version of the F6 should be able to run up to 28 or 30V rails depending on heat sinking capacity. Think 400mm deep chassis.
I have a tube of Fairchild NOS FQH44N10 parts waiting for this one. Will also try a set of the IRFP048 to see how they sound in comparison. These boards are going to be swapped into my original F6 chassis to give them a workout.
I have PCBs already waiting for some parts to arrive from Mouser. This is the version of the F6 that I originally built to make the most of higher voltage rails & higher bias current supported by the FQH44N10 Mosfets. The Diamond buffer is a minor variation of the Austin input stage that Mark J. designed for the M2x. It became my favorite and remains in semi-permanent installation in my M2x. The Toshiba TTC004B and TTA004B bipolars are able to withstand higher voltage and power dissipation than the ZTX parts used originally. This version of the F6 should be able to run up to 28 or 30V rails depending on heat sinking capacity. Think 400mm deep chassis.
I have a tube of Fairchild NOS FQH44N10 parts waiting for this one. Will also try a set of the IRFP048 to see how they sound in comparison. These boards are going to be swapped into my original F6 chassis to give them a workout.
These caps were also in the premium 300b amp of the much missed Maison de l'Audiophile ( with Jean Hiraga) in Paris
@TA, any idea on when the gerbers for the diamond buffer version will be published, just asking to see if I should delay placing a current order with JLCPCB, to wait to also include those pcb's. - not rushing you though.
Would the gate capacitance prevent secondary saturation...?? I don't know... but, it might be worth checking...
Last edited:
The Jensens are being driven well below their max output level of 20 dBu. The laminations are 50% nickel. I would not anticipate issues with saturation in the windings.
My plans are to build and test the new F6 Diamond PCBs over the weekend; parts are scheduled to arrive this afternoon. There is a lot more going on with this design, and I want to make sure everything is Ok before releasing it.
As with the previous boards, these are just for the Jensen JT-123-FLPCH.
Here is a list of parts that are specific to this build, plus some recommended resistors and trimpots.
As with the previous boards, these are just for the Jensen JT-123-FLPCH.
Here is a list of parts that are specific to this build, plus some recommended resistors and trimpots.
OK, thanks for the further update TA, I will wait on a while before placing any JLCPCB order, good luck with your weekend build.
Just a quick question TA, on the Jfet board the pots P1 and P2 have inline pins, and on the parts list for the diamond buffer version you show in post #48 you have pots P1 and P2 with staggered pins (the X version pin layout) - is this correct, as I am just getting a Mouser order ready.
OK, thanks for that, TA will have to amend the partial parts list he has shown.
Part # would be 652-3266Y-1-502LF (Mouser)
Part # would be 652-3266Y-1-502LF (Mouser)
Last edited:
Well dang, I thought I had the Bourns code figured out. Was just soldering parts into the boards and needed to use wide flat faced pliers to force the pins into an inline format.
Thanks for the corrected part#, I’ll get it into the list.
Thanks for the corrected part#, I’ll get it into the list.
Hi TA,
Hope your build of the F6 with the diamond buffer is going well.
Share some pics when you are done. 🙂
Hope your build of the F6 with the diamond buffer is going well.
Share some pics when you are done. 🙂
"more challenging" - is that just because there are more components than the Jfet version? Let us know your thoughts once tested and you have had a listen,thanks. Great work by the way, any reason why the zeners are missing.
Yes, “more challenging” = quite a few more parts with more tiny leads densely packed.
I appreciate the thoughts and comments.
I appreciate the thoughts and comments.