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Old 19th March 2012, 11:55 PM   #11
Zen Mod is offline Zen Mod  Serbia
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try to decrease OLG of your J2 , and listen is there difference you need
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Old 20th March 2012, 12:00 AM   #12
a.wayne is offline a.wayne  United States
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After comparing prices too ................
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Old 20th March 2012, 12:50 AM   #13
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Quote:
Originally Posted by Nelson Bass View Post


So... What can cause the reduced spatial ambience? Feedback? Capacitance in PSU?
IMO
Phase response and armonics and speed
not gettin in to which one is best as it is all a mater of taste.

Whit what records
? Tried Masterpiece the Temptations ?
can you tell where the band is positioned how tall they are when hand clapping.

Figure up 2 guitars say Fender or Gibson tuned exactley to same note do they sound the same?

No they don't is all down to wood how they are built how the pick ups are wound and so on the note is exactley yhe same frequency so what change?

Which one is better? no one just do things a different way for different taste
IMO
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Old 20th March 2012, 01:13 AM   #14
labjr is offline labjr  United States
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"What causes reduced spatial ambience?"

Not enough drugs.
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Old 20th March 2012, 02:25 AM   #15
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Lord of the SIT sez:

In the case of the J2, try removing the Source resistance on the bottom
Jfet and then lowering the amount of feedback. Easiest place for that is
increased value of the feedback resistor from output to (-) input. Make the
input resistor to ground for the same value if you are running balanced.

Don't forget to re-adjust the DC offset.

6 dB more super-happy-fun gain!

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Old 1st April 2012, 11:42 AM   #16
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Quote:
In the case of the J2, try removing the Source resistance on the bottom
Jfet
how will this mod affect the f2j?
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Old 2nd April 2012, 10:04 PM   #17
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Similar effects.

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Old 2nd April 2012, 10:33 PM   #18
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I want some effects ala LabJr. Regards
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Old 18th August 2012, 09:57 PM   #19
generg is offline generg  Germany
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Quote:
Originally Posted by Nelson Pass View Post
Lord of the SIT sez:

In the case of the J2, try removing the Source resistance on the bottom
Jfet and then lowering the amount of feedback. Easiest place for that is
increased value of the feedback resistor from output to (-) input. Make the
input resistor to ground for the same value if you are running balanced.

Don't forget to re-adjust the DC offset.

6 dB more super-happy-fun gain!

Yes i did it.....and i like it! I choose 150k for the feedback resistor.

I even replaced the the chain of the drain resistor of the lower SS and the source resistor of the upper SS (around 0R8) by a chain of 8 0R1 resistors and changed the node where output and feedback connection meet step by step...
Sound change was interesting, but Helas! I liked the masters point most!

And the omitting of the source resistor and loosening the feedback was more important for the sound improvement finally.
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Old 21st August 2012, 02:59 AM   #20
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There is an important DIY point imbedded here, which is that given the
particular sound of an amplifier (or other component) there are often
inexpensive ways of adjusting it in a particular direction. I happen to
have known the answer through experimentation, and the J2 sound
was a particular choice, but not the only one available.

Contrast this inexpensive approach with "Recap everything with the all
new Vera$$ity mk 4 teflon$, replace all the wire with 99.999999
gold filament$ wound helically around organic $paghetti noodles boiled
in $quid ink and align the magnetic pole$ of the transformer to the center
of Orion'$ belt during the $olar eclip$e"

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