Charles Hansen come in please

[Wizard]

Hello, Charles Hansen ,Can you recommend the best of power supply for the Erno_Borbely's

EB-2000/402 SE Balanced Jeft Lineamp?
Thank you very mach.

[Charles Hansen]

Hello -

I'm not sure why you're asking me instead of Erno Borbely. This circuit is not the kind of thing that I'd recommend. However, I can make a couple of comments:

1) The power supply rejection ratio of this circuit isn't very good, so its performance will be quite dependent on the quality of the power supply.

2) It is possible to blow the 2SJ74s used in the output stage. These are rated at 25 volts and if the circuit is running up to the clipping point, the full rail of 36 volts will be applied. You might try reducing the supply rails.

Hope this helps,
Charles Hansen

[Jocko Homo]

He asked you instead of John Curl.

Jocko

[lumanauw]

Hi, Charles Hansen,

Why do you say this in Etalon thread

If you want to get rid of the servo, I would also suggest getting rid of the error correction. In my experience you are better off just adding another pair (or two or three) of output devices. This is particularly true for this design as the triple emitter-follower output stage will be able to drive low impedance loads quite well.

I'm very interested with error correction, but your indications are not to use them. Including the comment by AndyC. I have questions.
1. Error correction can improve damping factor. Is applying error correction gives AUDIBLE difference/result (not only measurement result?)
2. I want to use error correction, but also parrareled (4 pairs) or triple emitor darlington output. Is this makes the error correction not worth it ( you compared error correction with parrareled output)
3. Please explain why you dont suggest error correction.

[lumanauw]

Can anyone help, where can I see Halcro design or at least Halcro patent? Some said Halcro uses modified error correction, I wanted to see what it likes.

[Wizard]

Hello, Charles Hansen. I thought I have made some mistakes in my words. I mean to find an excellent power supply circuit that is used in Erno_Borbely's EB-2000/402 SE Balanced Jeft Lineamp. Can you give me some recommends(advice)? Thanks very much!

[Wizard]

Hello, Charles Hansen. I thought I have made some mistakes in my words. I mean to find an excellent power supply circuit that is used in Erno_Borbely's EB-2000/402 SE Balanced Jeft Lineamp. Can you give me some recommends(advice)? Thanks very much!

[john curl]

I built a nearly exact example of this design for the Grateful Dead at Alembic Inc in 1973. It is somewhat dated, but Walt Jung's power supplies should work OK. Be careful about power supply noise, as it can easily get into the design.

[Wizard]

Hello ,John Curl.
Can you give me the circuit?
Thank you very mach!

[Charles Hansen]

Originally posted by lumanauw
Can anyone help, where can I see Halcro design or at least Halcro patent? Some said Halcro uses modified error correction, I wanted to see what it likes.

Go to:

http://patft.uspto.gov/netahtml/srchnum.htm

and search under patents 6600367 and 5892398