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-   -   J-JLH or PLH-J ? (http://www.diyaudio.com/forums/pass-labs/164938-j-jlh-plh-j.html)

drjbf1 12th April 2010 09:47 AM

J-JLH or PLH-J ?
 
In the PLH article Nelson says:

"If you send me a bag of high power Jfets, Iíll supply a schematic that will work with them, too."

Has anyone seen such a schematic?

flg 12th April 2010 11:55 AM

Only the "simplified" J2 as far as I have seen...
:Pawprint:

Nelson Pass 12th April 2010 09:59 PM

I had forgotten that I made such a promise. It is, however
very do-able. All you have to do is send me that bag. I
cannot be expected to supply the high power Jfets as well...

:cool:

Blues 12th April 2010 10:13 PM

:rofl:

Circuit should be reserved for the PL custom power jfets:snail: Maybe the color green will make it get to the production line sooner...

FYC 13th April 2010 01:07 PM

A step forward at least, is to replace the input IRF610 with a J-FET. I've done that and I do see an improvement. As a matter of fact, I put 2 2SK147 in parallel as the input stage in place of the IRF610.

Nelson Pass 13th April 2010 08:32 PM

I have not tried it yet, but I would expect interesting results
with the SJEP170R550.

:cool:

tmblack 18th July 2011 09:31 PM

How would one make a PLH with a dual power supply?
In the article that was left as a future exercise.

tmblack 18th July 2011 09:32 PM

Quote:

Originally Posted by FYC (Post 2152087)
A step forward at least, is to replace the input IRF610 with a J-FET. I've done that and I do see an improvement. As a matter of fact, I put 2 2SK147 in parallel as the input stage in place of the IRF610.

How would the circuit change if any with the input J-FET ?

flg 18th July 2011 09:45 PM

Quote:

Originally Posted by tmblack (Post 2643076)
How would one make a PLH with a dual power supply?
In the article that was left as a future exercise.

The Class-A Amplifier Site Here you will find at least one version like that :D

sheep 19th July 2011 06:43 PM

I'll work on the latest JLH dual supply version with power BJT's as I have a large supply and they are much cheaper. I'll add the current sources using DM2540 depletion FETS though.


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