F6 Illustrated Build Guide

[kaputt]

These are for the input buffer stage.

 

[Bones13]

Small panic attack I have ordered/paid for the F6 Boards & Tx package.
And the matched Jfets package:
Matched JFET pairs (Grade B) - Parts

Now I'm wondering if these are actually For the F6 build??
Photo sure doesn't look like ones that are bolted to the Heatsink.

Help?

If you look at 6L6s pictures at the front of this thread, those transistors are zip-tied to each other (for thermal similarity).

The power mosfets are larger, and flat, and you have to order those with the other parts.

 

[Bare]

Thank you ..The store's parts photos (not to mention Inexperience) were confusing me

That said; does anyone have a Rudimentary Mouser BOM ?
Asking because there is Fair chance that I will bungle the order.
I'm finding hunting through their catalogue as intimidating, simply too many choices.

 

[rayma]

Hi rayma, I got it figured out, it was a power supply problem.

What was it, one rail not working?

 

[guglielmope]

Anyone have tested E120R10X on this amp?
Have a nice day.
Guglielmo

 

[needtubes]

It isn't clear whether anyone but NP or SemiSouthfan ever had his/her hands on these.

 

[tubesguy]

Two questions re this build: First, Jim's initial photos show the boards and outputs attached to the heatsink prior to running the wiring to the boards. Is this just for illustration purposes, or is this the way to proceed? (In other words, can I make all solder connections with the (stuffed) boards mounted?)

Second, what type of fuses are used with the Schurter switch/fuse holder included with the Store back panel parts for the 4U and 5U chassis?

Getting close. Have modified the boards for degeneration from the start, and have chokes for a CLC power supply. Hoping this will be the best-sounding amp in the tri-state area.;-)

 

[kaputt]

Not using the choke as an input after the rectifier seems like a waste to me. But it will work as a filter.

 

[2 picoDumbs]

Yes you can solder wiring to board last. No problem

 

[2 picoDumbs]

2.5A slow blow fuse for 120V

 

[tubesguy]

Thanks, 2

 

[Bare]

F6 'kit' and fets arrived today
Quick delivery, but Innoportune time, it being High Xmas season and all.
Surprised by how Tiny the jensen transformers are...( tough to judge scale from photos ) and by how few bits there are going to be on those PCBs..

 

[2 picoDumbs]

Merry Christmas

 

[Bare]

Certainly it's off to a good start
Erm.. Importance of Matched Irfp240's.
I can't do this capably , so will have buy matched ones if it's deemed necessary.

 

[vdi_nenna]

It's a "nice to have", but not absolutely necessary.

Amp will work without matched output mosfets.

 

[Bare]

Thank you.. Yess understand it's not essential, but will I be regretting the easy choice.. after it's finished .. the Usual scenario.
Will there be audible differences? My hearing, while tested as good, isn't that of a Teenager either

 

[6L6]

Will there be audible differences?

If you can set bias and offset properly, no.

 

[2 picoDumbs]

Thank you.. Yess understand it's not essential, but will I be regretting the easy choice.. after it's finished .. the Usual scenario.
Will there be audible differences? My hearing, while tested as good, isn't that of a Teenager either

I intentionally looked for UNMATCHING. Hahahaha
I don't like throwing out perfectly good 2nd harmonic.
That's just me though.

Just build it and have fun, it's a great amp. Don't worry about matching.

 

[6L6]

I intentionally looked for UNMATCHING.

Actually, with the stock source resistor values, Nelson already beat you to it...

 

[2 picoDumbs]

Actually, with the stock source resistor values, Nelson already beat you to it...

But only if you reroute cap leads to other side of resistor lead.