F6 Illustrated Build Guide

[2 picoDumbs]

Do you have a trustworthy supplier of Toshiba mosfets?

 

[tamra]

For 2sk1530 yes,no 2sj201.
But it's only 15 left.
I can buy them if you want.

 

[flocchini]

@tamra

Did you use Toshiba 2SK1530 at Q1 and Q2?

Has anyone tried Toshiba2SK1530 at Q1 and IXTH64N10L2 at Q2?

Time to rebuild my F6 (Tea Bag boards blue LEDs etc) which currently has IRFP 150 at Q1 and Q2. I will do 2pico mods

Thanks

Bob

 

[zman01]

Bob,

As part of the upgrades, you plan to put green LEDs in place of the blue LEDs?

 

[flocchini]

Yes I do and also use 3.2k resistors- it should be relatively easy on the Tea Bag board.

 

[2 picoDumbs]

@tamra
I will do 2pico mods

Thanks

Bob

Must be done exactly as described.
Vishay IRFP250 (not IRFP150)
Ixys IXTH64N10L2

 

[zman01]

Yes I do and also use 3.2k resistors- it should be relatively easy on the Tea Bag board.

Cool - good luck with the changes and it would be nice to see pics. 🙂

 

[flocchini]

2 pico - I will do exactly as described

pics will follow in a week? or so 😉

thank you

 

[tamra]

@tamra
Did you use Toshiba 2SK1530 at Q1 and Q2?
Bob

I have used 2sk1530 both Q1 and Q2 with 0.22ohm source resistor. No other change.
I have not done pico's mod without led.

 

[zman01]

tamra,

If I am not wrong Toshiba 2SK1530 is a T0-220 part and smaller than the TO-247 devices that the PCB is design for.

How are you connecting the 2SK1530 - is it using leads (wires)?

 

[2 picoDumbs]

TO-264

 

[tamra]

I connected with copper wire.
Actually one of 2sk1530 leg was easily snapped when I tried to bend.

 

[2 picoDumbs]

That shouldn't happen.
Copper is extremely ductile.

 

[flocchini]

I have used 2sk1530 both Q1 and Q2 with 0.22ohm source resistor. No other change.
I have not done pico's mod without led.

thank you

 

[tamra]

That shouldn't happen.
Copper is extremely ductile.

Yes,I surprised 2 legs snapped.
But sound is very good.

 

[dyrevennen]

Green LED References
R7 Anything between 2k and 3.3k
R8 Same as R7

Q1 IRFP250 (do not use IRFP150), - IRFP140 might be suitable but this has not been tested as yet.
Q2 IXTH64N10L2
R1 0.22 Ohms
R2 0.22 Ohms

R3 100 Ohms
R2 Anything between 20 and 23 Ohms

Bias around 1.5A to 1.75A

This will get you J2/Aleph J like operation without needing to degenerate - but also with the additional benefit of Class AB operation.

I am considering to do this mod over xmas. What is the recommended power-rating for R1 and R2?

Thanks for sharing. Awesome 🙂

 

[Monk55]

3w

 

[Russellc]

Just so there is no mistake

Q1 IRFP250 (Vishay)
Q2 IXTH64N10L2 (Ixys)

What sort of matching is to be done regarding Q1 and Q2? Getting ready to order some and wondering how many assuming some kind of matching is required...

Thanks,

Russellc

 

[2 picoDumbs]

I will check my data again

 

[Russellc]

thanks,🙂

Russellc