SEN / CEN All JFET IV Converter Evaluation Pack - diyAudio
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Old 14th September 2011, 05:32 PM   #1
EUVL is offline EUVL  Europe
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Join Date: Oct 2003
Default SEN / CEN All JFET IV Converter Evaluation Pack

I now open a GB thread for the SEN / CEN All JFET IV Converters, as published in Linear Audio Volume 2.

Some details and discussions of circuit variants can be found here :

Zen -> Cen -> Sen, evolution of a minimalistic IV Converter


The content of the evaluation pack can be found here :

Zen -> Cen -> Sen, evolution of a minimalistic IV Converter

Each will cost 50 Euros including registered air mail but excluding Paypal fees.
Delivery is FOB, i.e. we are not responsible for postal losses.

To make life easier to source P-JFETs, I shall make available 40 pairs of 2SJ74BLs, matched to better than 30uA Idss.
These can however only be purchased in combination with the evaluation kit, and limited to one pair per person.
The additional cost will be 5 Euros plus Paypal fees.

I shall leave this open till end of September.
Minimum subscription is 60 packs, before we can start lot production.

You can subscribe by putting down your details in the following list.


Patrick

.

Last edited by EUVL; 14th September 2011 at 05:36 PM.
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Old 14th September 2011, 05:33 PM   #2
EUVL is offline EUVL  Europe
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Name__________ No of Kits___2SJ74 matched pair___Total costs excl Paypal

....
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Old 14th September 2011, 05:42 PM   #3
EUVL is offline EUVL  Europe
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Not that I do not want to have your support.
But I suggest you only subscribe for 1 evaluation kit first to try them out.

If you still like them as we do, we shall make them available over the longer term.
i.e. You can re-order later.


Patrick
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Old 14th September 2011, 06:17 PM   #4
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I don't undrestand the sj74 matched pair. Don't they have to match with the 170?

for 2 channel balanced, wouldn't I need 2 matched pairs?

Last edited by necplusultra; 14th September 2011 at 06:30 PM.
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Old 14th September 2011, 07:18 PM   #5
EUVL is offline EUVL  Europe
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Join Date: Oct 2003
Yes, they do have to bematched with 2SK170s.
But 2SK170s are so widely available, that you can get them somewhere much cheaper in bulk.
And then you can pick a pair to suit.

But you can also get 2SK170 / 2SJ74 matched here :
Toshiba 2SK170BL for sales

They might well be cheaper than what I have to offer.
And I would not mind saving the 40 pairs for myself if they don't go.


You are right, one needs 2 pairs of 2SJ74 for each evaluation pack.
So OK, 2 pairs per person max.


Patrick
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Old 14th September 2011, 07:25 PM   #6
EUVL is offline EUVL  Europe
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See also

Zen -> Cen -> Sen, evolution of a minimalistic IV Converter

for cost breakdown.


Patrick
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Old 14th September 2011, 08:52 PM   #7
Murdoc is offline Murdoc  Germany
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Location: Paderborn
Hi Patrick,

last days I loved to read about this genious I/V converter and now I can't wait to get my handy on a pair of Zen/Cen boards!
This is why I would like to order 1 pair boards and 1 pair of matched 2SJ74:
Murdoc, 1 Kit, 2 matched pairs of 2SJ74, makes 54 total costs excl. Paypal fee.

Thank you guys for your work on this!
Greeting Matthias
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Old 14th September 2011, 09:05 PM   #8
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Join Date: Jan 2011
Location: sitting down
Name __________ No of Kits___2SJ74 matched pair___Total costs excl Paypal
Name necplusultra No of Kits 1 2SJ74 matched pair 2 Total costs excl Paypal 60€
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Old 14th September 2011, 11:31 PM   #9
EUVL is offline EUVL  Europe
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Join Date: Oct 2003
Please note :

One pair of 2SJ74BL matched is 5 Euros.
I think same as Spencer but much tighter match.

Patrick


necplusultra__1 Kit__2 matched pairs__60€
Murdoc__1 Kit__2 matched pairs__60€
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Old 15th September 2011, 12:04 AM   #10
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maravedis_1 Kit__2 matched pairs__60€

thanks
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