F5 power amplifier - Page 151

h_a · 25th July 2008, 02:08 PM

Seems the 2SK1530A is not a Toshiba part, but a Sony Mosfet used in some high-$ vintage gear (if you call gear from 2000 vintage, that is).

Have fun, Hannes

tryonziess · 25th July 2008, 02:08 PM

Nelson pcb,
And when are these little Nelson Pass pcb's going to be available? I would like about 4 of them.

On another note. What is the preferred method of utilizing jfets in the input section when the voltage available is beyond the fjets range. Many members have their own ideas on this ie, resistor, cascode, series with mosfet etc. Which works best? Thanks. Tad

jacco vermeulen · 25th July 2008, 02:15 PM

Quote:

Originally posted by h_a
not a Toshiba part

Same Toshiba part, but a special edition with goldplated leads.
The A-types were for sale briefly, but at 10 times the cost of the regular version.

h_a · 25th July 2008, 02:29 PM

Quote:

And when are these little Nelson Pass pcb's going to be available?

Master says soon. So somewhere this year?

Quote:

What is the preferred method of utilizing jfets in the input section when the voltage available is beyond the fjets range

You can just cascode it - with whatever you want (bjt, mosfet, jfet). The resistor you mention is the load and will not ensure that the jfet sees sufficiently low voltage.

Have fun, Hannes

EUVL · 25th July 2008, 03:14 PM

> I'm waiting for Nelson's pcbs. Sure I could do my own, but having at least a single Nelson Pass piece is a bit special

This place is called DIY Audio ??

> I'm still thinking of the Toshibas, it's just that I have more than enough Fairchilds already at hand...

Why not just build the Fairchild first ?
Then you can always decide to swap the Toshibas in later on.

Patrick

Zen Mod · 25th July 2008, 03:36 PM

Quote:

Originally posted by EUVL
> I'm waiting for Nelson's pcbs. Sure I could do my own, but having at least a single Nelson Pass piece is a bit special

This place is called DIY Audio ??

.......

Patrick

you forgot smiley there .

maybe someone wants 4 Papa's pcbs to hang them on wall , as pride and joy ?

Blues · 25th July 2008, 03:39 PM

Quote:

Originally posted by EUVL
[BIn any case, don't do armchair DIY...
Patrick [/B]

For that I have a powerhouse of researchers, experimenters and developers that include you, NP, JC, BC, etc...throw in JaccoV when you're going through your parts list and you want a good laugh...then I start building

Thank you.

jacco vermeulen · 25th July 2008, 03:47 PM

Actually, i was thinking of using the F5 boards as body jewelry at the nudy beach.
Single Ended, of course.

chrismercurio · 25th July 2008, 03:47 PM

This may be DIY Audio...though around here if you snooze you lose.

Power J-Fet anyone?

jacco vermeulen · 25th July 2008, 03:53 PM

Sure, you got some P-channel PWRLites for moi ?

25th July 2008, 02:08 PM	#1501
h_a diyAudio Member Join Date: Sep 2006 Location: Graz, Austria	Seems the 2SK1530A is not a Toshiba part, but a Sony Mosfet used in some high-$ vintage gear (if you call gear from 2000 vintage, that is). Have fun, Hannes __________________ fresh matched IRFP240/IRFP9240 fets \|\| AlephJ/JX-kits F5 transistor kits \|\| Burning Amp BA-1/2/3 transistor kits

25th July 2008, 03:47 PM	#1508
jacco vermeulen diyAudio Member Join Date: Oct 2004 Location: At the sea front, just under Rotterdam	Actually, i was thinking of using the F5 boards as body jewelry at the nudy beach. Single Ended, of course. __________________ Looks like Sponge Bob has killed another thread.

25th July 2008, 03:53 PM	#1510
jacco vermeulen diyAudio Member Join Date: Oct 2004 Location: At the sea front, just under Rotterdam	Sure, you got some P-channel PWRLites for moi ? __________________ Looks like Sponge Bob has killed another thread.

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25th July 2008, 02:08 PM	#1502
tryonziess diyAudio Member Join Date: Apr 2007	Nelson pcb, And when are these little Nelson Pass pcb's going to be available? I would like about 4 of them. On another note. What is the preferred method of utilizing jfets in the input section when the voltage available is beyond the fjets range. Many members have their own ideas on this ie, resistor, cascode, series with mosfet etc. Which works best? Thanks. Tad

25th July 2008, 03:14 PM	#1505
EUVL diyAudio Member Join Date: Oct 2003	> I'm waiting for Nelson's pcbs. Sure I could do my own, but having at least a single Nelson Pass piece is a bit special This place is called DIY Audio ?? > I'm still thinking of the Toshibas, it's just that I have more than enough Fairchilds already at hand... Why not just build the Fairchild first ? Then you can always decide to swap the Toshibas in later on. Patrick

25th July 2008, 03:47 PM	#1509
chrismercurio diyAudio Member Join Date: Aug 2006 Location: Silicon Valley	This may be DIY Audio...though around here if you snooze you lose. Power J-Fet anyone?

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