More info & pics of FirstWatt F3 PowerJFet on Sixmoons - diyAudio
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Old 15th December 2005, 02:56 AM   #1
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Default More info & pics of FirstWatt F3 PowerJFet on Sixmoons

Sixmoons has put more info up on the F3:

F3 on Sixmoons
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Old 15th December 2005, 10:41 AM   #2
steenoe is offline steenoe  Denmark
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Those fets sure look like good ol' TO247 to me Not like those Lovoltechs in a weird house. But I guess they could be the ones underneath the flange?

Steen.

BTW Very nicely build
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Old 15th December 2005, 04:41 PM   #3
Buhl is offline Buhl  Denmark
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Quote:
Originally posted by steenoe
Those fets sure look like good ol' TO247 to me Not like those Lovoltechs in a weird house. But I guess they could be the ones underneath the flange?

Steen.

BTW Very nicely build

I think the good ol' TO247 IS good ol' IRFP240 - but look just above the RCA input socket in the top-down picture - three small legs going in under the heatsink, and a small nut on top......mabye it's the Jfet ??

Cheers !
Buhl
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Old 15th December 2005, 06:18 PM   #4
steenoe is offline steenoe  Denmark
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Yep, I think they are irfp240's too. If that is the case, the reviewer at 6 moons had it all wrong. Here is quoting from 6moons:
Quote:
the power JFET, shown enlarged above.
The picture he reffers to is attached below Either that, or NP did have them custom made Those suspicious 3 legs underneath the flange is more likely the Jfet

Steen
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File Type: jpg 2_hero_jfet.jpg (44.0 KB, 1446 views)
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Old 15th December 2005, 06:21 PM   #5
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One Mosfet for CCS, one Mosfet for the Cascode, so what's the 3rd mosfet for

SMathews
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Old 15th December 2005, 06:57 PM   #6
Blues is offline Blues  United States
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Quote:
Originally posted by SMathews
One Mosfet for CCS, one Mosfet for the Cascode, so what's the 3rd mosfet for

SMathews

The 3rd Mosfet is for Voltage Regulation like I said in another thread. Yes I'm 100% those 3 legs sticking out is that of the Jfet sandwiched between the pcb and the flange with the heatsink surface facing up of course.
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Old 15th December 2005, 11:11 PM   #7
lohk is offline lohk  Europe
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I may be wrong, but doesn't the JFET sit under the PCB, not sandwiched between the heatsink and the PCB? I can see a cutout or hole in the PCB where the three legs are visible.
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Old 15th December 2005, 11:42 PM   #8
moe29 is offline moe29  United States
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reviewer doesn't know the difference between a MOSFET and a JFET!

i suppose we can cut some slack to a non-DIYer
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Old 16th December 2005, 05:06 AM   #9
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Trust me...these things are much, much smaller than a TO-247. They're about the size of your pinky fingernail. I haven't looked at these pictures, but from pictures I saw before I seem to recall that the JFET appeared to be sandwiched between the PC board and the heatsink flange--a stealth part.

Grey
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Old 16th December 2005, 05:35 AM   #10
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Hi nice review,who did it, first off this product is pure class-a,
no doubt about!,i was expecting to hear good words about it
there has been no mention of how it sounded at all, i am disappointed because my pure class-a s sound like super sonics

I wish Mr Pass good luck in the field of pure A it would be a tough
field to compete in in the future

regards
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