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Old 27th March 2009, 07:29 PM   #11
audiodan is offline audiodan  New Zealand
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Hello All

Thanks for your knowledge Much Appreciated !

Another Question.
I see that a dual supply is needed but I was gonna use the same transformer used with my AP1.7, have the 1.7 and pearl in one box and power supply in another. Supply is 30-0-30v 160VA. Yes i know its overkill but the price was right.
Should I swap for two 0-30 transformers, in which series them up and power ap1.7 and use seperately for pearl?

Cheers
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Old 27th March 2009, 08:15 PM   #12
steenoe is offline steenoe  Denmark
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What really needs matching in the Pearl (as with all RIAA's ) is the equalization components. Those parts are mainly R19, R22, R23, R24, C10, C13, C11 and C12. The main concern is to match them so they are the excact same in each channel. Doing this will greatly add to the soundstage, both in width and depth. The Pearl is capable of delivering an great soundstage, if this is taken care of. The excact value is not as important as being the same between channels. Mrupp mentioned this, and I think it deserves to be repeated
You would also do good by matching at least Q8-Q11 to some degree, since they sit in //. Not really needed though, as mentioned above.

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Old 29th March 2009, 07:40 AM   #13
audiodan is offline audiodan  New Zealand
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Thanks for that steenoe

I take it there is no problem with not using a dual supply.
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Old 21st January 2016, 04:06 PM   #14
ci11 is offline ci11  United States
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Quote:
Originally Posted by Nelson Pass View Post
Get a 5 to 13 volt supply and a DC voltmeter. Connect the +V to the
Drain, connect the Gate and Source together to a 100 ohm resistor,
and connect the other lead of the resistor to ground.

Measure the voltage across the resistor, which gives the Idss. 1 volt
= 10 mA of current.

Try to measure all devices under the same conditions, temperature,
and duration of test.

Mr Pass,

I know this is an old thread but would you mind checking the attached circuit to see if this is what you mean in the post regarding checking Idss?

Thanks!
Attached Images
File Type: png Nelson Pass JFet Idss Tester.png (20.3 KB, 865 views)
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Old 21st January 2016, 04:44 PM   #15
vdi_nenna is offline vdi_nenna  United States
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2SK170 matching
Is this matching different than Idss matching? This is Vgs matching?
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Old 21st January 2016, 04:52 PM   #16
Zen Mod is offline Zen Mod  Serbia
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trick question - what is voltage between gate and source , on that picture ?

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Old 21st January 2016, 04:57 PM   #17
ci11 is offline ci11  United States
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Quote:
Originally Posted by Nelson Pass View Post
Get a 5 to 13 volt supply and a DC voltmeter. Connect the +V to the
Drain, connect the Gate and Source together to a 100 ohm resistor,
and connect the other lead of the resistor to ground.

Measure the voltage across the resistor, which gives the Idss. 1 volt
= 10 mA of current.

Try to measure all devices under the same conditions, temperature,
and duration of test.

Quote:
Originally Posted by Zen Mod View Post
trick question - what is voltage between gate and source , on that picture ?


ZM,

Not a trick question, only following papa's instruction as highlighted above in his message.
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Old 21st January 2016, 05:09 PM   #18
Zen Mod is offline Zen Mod  Serbia
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circuit is good , but I was (sort of ) replying on vdi_nenna's post .....

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Old 21st January 2016, 05:12 PM   #19
ci11 is offline ci11  United States
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Quote:
Originally Posted by Zen Mod View Post
circuit is good , but I was (sort of ) replying on vdi_nenna's post .....

ZM,

Thanks for the confirmation. I will go rig this up.
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Old 21st January 2016, 05:20 PM   #20
vdi_nenna is offline vdi_nenna  United States
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Quote:
Originally Posted by Zen Mod View Post
trick question - what is voltage between gate and source , on that picture ?

I don't know. 1 volt?
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