F5X -- the EUVL Approach - Page 40

JBdV · 11th August 2011, 03:16 PM

Spencer will get back to me next week

ashaw · 11th August 2011, 03:19 PM

What specifications did you ask for might I ask?

JBdV · 11th August 2011, 09:27 PM

I have asked for perfect pairs (7,0 and 8,18 mA) and higher current versions if not available, of course everybody can contact Spencer, but I think one joined effort may be better for all parties.(my response to him was pretty quick)
I am willing to buy 50 or maybe more of his best pairs (quads, octets), and provide them for cost to all F5X builders (as far as they need them)
I will keep the rest for future ventures.

ashaw · 11th August 2011, 10:13 PM

I was asking as I had also asked him for some transistors, and was wondering what level of match you were wanting. I asked for 0.05mA match, I was wondering what level of match you asked for.

Woody1911a1 · 11th August 2011, 10:41 PM

will be interested in what he says . out of the 400 j74'2 and 400 k170's that i bought , i couldn't come up with even one set of those values . these were toshiba packaged 200/bag bl grade fets .

good to see another source to continue the good times

cheers Woody

JBdV · 11th August 2011, 10:42 PM

I have asked him to mark all suitable fets with current value with 2 digits after the comma, so picking for best pairs from a bigger quantity will be effective (normally he matches within 0,2 mA)

NYCOne · 12th August 2011, 02:09 AM

Quote:

Originally Posted by JBdV

I have asked him to mark all suitable fets with current value with 2 digits after the comma, so picking for best pairs from a bigger quantity will be effective (normally he matches within 0,2 mA)

I have two "dengen" octets left. Matched to better than 3%.

PM for info.

JBdV · 11:34 AM

It looks like we are lucky! Spencer will be able to provide pairs of fets in 2 ranges:

K170 will be 6.9 to 7.0 or 7.0 to 7.1 and J74 will be 8.1 to 8.2 or 8.2 to 8.3 mA

There will be enough for all F5X builders if they want.

I will buy the complete lot from Spencer and offer them to all F5X builders for cost.
(The rest I will save for future adventures)

ashaw · 21st August 2011, 12:33 PM

Also Spencer will do accurate 5R1 degeneration's, (he has got a very good set for me).

EUVL · 21st August 2011, 12:49 PM

Since he has a large pool to match from, you should make use of the opportunity and ask him to match for transconductance as well as bias current.

I am sure he knows how. If not he can PM me.

Patrick

21st August 2011, 11:33 AM	#398
JBdV diyAudio Member Join Date: Mar 2009	It looks like we are lucky! Spencer will be able to provide pairs of fets in 2 ranges: K170 will be 6.9 to 7.0 or 7.0 to 7.1 and J74 will be 8.1 to 8.2 or 8.2 to 8.3 mA There will be enough for all F5X builders if they want. I will buy the complete lot from Spencer and offer them to all F5X builders for cost. (The rest I will save for future adventures) Last edited by JBdV; 21st August 2011 at 11:34 AM. Reason: typo

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11th August 2011, 03:16 PM	#391
JBdV diyAudio Member Join Date: Mar 2009	Spencer will get back to me next week

11th August 2011, 03:19 PM	#392
ashaw diyAudio Member Join Date: Jul 2006	What specifications did you ask for might I ask?

11th August 2011, 09:27 PM	#393
JBdV diyAudio Member Join Date: Mar 2009	I have asked for perfect pairs (7,0 and 8,18 mA) and higher current versions if not available, of course everybody can contact Spencer, but I think one joined effort may be better for all parties.(my response to him was pretty quick) I am willing to buy 50 or maybe more of his best pairs (quads, octets), and provide them for cost to all F5X builders (as far as they need them) I will keep the rest for future ventures.

11th August 2011, 10:13 PM	#394
ashaw diyAudio Member Join Date: Jul 2006	I was asking as I had also asked him for some transistors, and was wondering what level of match you were wanting. I asked for 0.05mA match, I was wondering what level of match you asked for.

11th August 2011, 10:41 PM	#395
Woody1911a1 diyAudio Member Join Date: Nov 2010 Location: Marblehead Ma	will be interested in what he says . out of the 400 j74'2 and 400 k170's that i bought , i couldn't come up with even one set of those values . these were toshiba packaged 200/bag bl grade fets . good to see another source to continue the good times cheers Woody

11th August 2011, 10:42 PM	#396
JBdV diyAudio Member Join Date: Mar 2009	I have asked him to mark all suitable fets with current value with 2 digits after the comma, so picking for best pairs from a bigger quantity will be effective (normally he matches within 0,2 mA)

21st August 2011, 12:33 PM	#399
ashaw diyAudio Member Join Date: Jul 2006	Also Spencer will do accurate 5R1 degeneration's, (he has got a very good set for me).

21st August 2011, 12:49 PM	#400
EUVL diyAudio Member Join Date: Oct 2003	Since he has a large pool to match from, you should make use of the opportunity and ask him to match for transconductance as well as bias current. I am sure he knows how. If not he can PM me. Patrick