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Zen Variation 9
Zen Variation 9
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Old 21st March 2018, 12:44 PM   #41
kinku is offline kinku  United States
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Zen Variation 9
What are you matching these devices on both Chanel for? Idss ?
In that case how about matching those 3W power resistors and capacitors in circuits too. Because they are 5-10% tolerance rated for values.
So for all the commercial amplifiers they pick fets and transistors after these matching process of some kind, so there is no assymetry between channels.
I think it is far of a stretch!
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Old 21st March 2018, 06:43 PM   #42
EUVL is offline EUVL  Europe
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> What are you matching these devices on both Chanel for? Idss ?

We match them with curve tracer under working conditions (in the triode cell) at working temperature.

> In that case how about matching those 3W power resistors and capacitors in circuits too.

We match those to well below 0.5%


Patrick
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Old 24th March 2018, 07:56 PM   #43
Soundhappy is offline Soundhappy  France
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Quote:
Originally Posted by carsten.witt View Post
Dear Mr. Pass,

for the EU boys I would like to say THANK YOU!

Shipping will be in a few days, thank you again!
Yes Mr. Pass thanks for generosity & gift of the jfet´s.
Warm thanks like class A heat sinks temperature are
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Old 25th March 2018, 05:56 PM   #44
Nelson Pass is offline Nelson Pass  United States
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Zen Variation 9
I've still got about 7,000. Maybe we should work up a kit in the store.
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Old 25th March 2018, 06:02 PM   #45
codewritinfool is offline codewritinfool  United States
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Zen Variation 9
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Originally Posted by Nelson Pass View Post
I've still got about 7,000. Maybe we should work up a kit in the store.
Sounds like a great idea to me.
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Old 25th March 2018, 06:15 PM   #46
res07njc is online now res07njc  United States
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A new LU kit would be wonderful! Perhaps something other than an voltage output section? Between them, vfets and Semisouths, it's been done. signed, Greedy.
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Old 26th March 2018, 08:22 AM   #47
EUVL is offline EUVL  Europe
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> I've still got about 7,000. Maybe we should work up a kit in the store.

I hope someone would at least do some prematching beforehand, as Grey did years ago.
Here are some measurements for some we bought from Grey years ago (~4USD a piece).
As well as some others bought in China unmatched.
They were measured in circuit (a 200mA triode cell as used in the DAO headphone amp).
As you can see, even the prematched ones are not perfect.

For the triode cell to work properly, as even in the ZV9, one has to measure and adjust circuit accordingly.
See Nelson's original article.

In the DAO & DAO circlotron, we measured all prematched ones from Grey and from Deepsurplus from the same grouping.
With a large enough pool of >>100, we can match to < 0.5% over the working range.


Patrick

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File Type: png LU1014D Prematched.png (8.4 KB, 85 views)
File Type: png LU1014D Random.png (22.3 KB, 85 views)
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Old 26th March 2018, 01:37 PM   #48
kinku is offline kinku  United States
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Zen Variation 9
EUVL still not sure the need for matching in ZV9 OR F3! As very few people are going to match resistors and capacitors as mentioned.

Last edited by kinku; 26th March 2018 at 01:52 PM.
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Old 26th March 2018, 01:52 PM   #49
woody is offline woody
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Has anyone measured the typical gate leakage?
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Old 26th March 2018, 02:11 PM   #50
EUVL is offline EUVL  Europe
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> still not sure the need for matching in ZV9 OR F3!

That depends on what sort of DIY you want to do.
I have nothing to add as Nelson & ZM already did.
My last post was meant for Nelson, BTW.


Cheers,
Patrick
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