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Old 19th May 2006, 05:00 PM   #101
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Quote:
Originally posted by choky
whatza initial DC offset for Aleph amp (from cold) ?

do we and when we will have chance to see J service manual ?
The cold DC figures for an Aleph are usually less than 500 mV.

I don't know about the J service manual - I haven't written in,
and I'm still shipping the product.
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Old 20th May 2006, 06:46 AM   #102
BillWW is offline BillWW  United States
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Default Compensation caps.

Well,

Its Friday, so I could not resist checking the Aleph jfet compensation caps tonight with my computer square wave generator. It was only able to use a 1Khz square wave not 10Khz.

After trying 5 through 10 pF, it looks like 10 pF was the best with out any ringing as Mark had shown previously. I tried 9 pF but there was a tad bit of ringing at 1Khz, so I guess the verdict is in for the jfet amp. 10 pF seems to be the best for no ringing on the square wave tests.

I did not have any oscillations while checking it and did not need the mpsa18 base to collector either with the .001 uF (1 nF) cap to stabilize the Aleph jfet, so I left it out.

I noticed touching the board caused extrenious noises, so perhaps that was the problem over at Mark's home.

I still need to check the AC current gain, but I think the jfet conversion is finished. I would like to try it one more time over at Mark's to see what he thinks along with Lyndon and then I could go ahead and write a pdf on what the end results were to build this conversion.


Mark may be out of town though, because I have not heard from him all week. He may be stuck in Wyoming again on a theatre install repair.

Bill
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Old 20th May 2006, 12:53 PM   #103
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Quote:
Originally posted by Nelson Pass


The cold DC figures for an Aleph are usually less than 500 mV.

I don't know about the J service manual - I haven't written in,
and I'm still shipping the product.

with delay circ for ldsp out in range of 1 minute,that's nice even for Lowthers

regarding manual-just take your time;
children are already spoiled too much
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Old 20th May 2006, 12:59 PM   #104
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Default Re: Compensation caps.

Quote:
Originally posted by BillWW


I still need to check the AC current gain, but I think the jfet conversion is finished. I would like to try it one more time over at Mark's to see what he thinks along with Lyndon and then I could go ahead and write a pdf on what the end results were to build this conversion.


Bill

If you need any help that I can give, just buzz
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Old 20th May 2006, 01:04 PM   #105
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Quote:
Originally posted by choky

spoiled . . .

???

Mmm . . .
Attached Images
File Type: jpg soon.jpg (19.1 KB, 215 views)
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Old 20th May 2006, 05:08 PM   #106
BillWW is offline BillWW  United States
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Default Re: Re: Compensation caps.

Quote:
Originally posted by choky



If you need any help that I can give, just buzz

Maybe, I will have you do my complete schematic layout of what I did. I then could incorporate that into my pdf and send it to you to post eventually.

I would still like Mark to check my bandwidth for higher frequency oscillations when he gets back, since my computer signal generator is bandwidth limited on doing a nice square wave.

Thanks again.

Bill

PS now it is time to just listen and burn the Aleph 3 jfet in for a while.
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Old 20th May 2006, 09:16 PM   #107
jleaman is offline jleaman  Belgium
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Any one care to see the New SMD Alephs ?

Here is a link to a hand full of picture's..

Yes it took lot's of time and patiance to do these

http://gallery.jasesspace.com/main.php?g2_itemId=487
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Old 20th May 2006, 10:24 PM   #108
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Default Re: Re: Re: Compensation caps.

Quote:
Originally posted by BillWW


PS now it is time to just listen and burn the Aleph 3 jfet in for a while.

yes!!!




Quote:
Maybe, I will have you do my complete schematic layout of what I did. I then could incorporate that into my pdf and send it to you to post eventually.
attaching file is easy:
keep it under 100KB, allowed formats are :gif jpg png txt zip jpeg pdf


for pics is smart to keep it under 1000xsmaller pixels


when you write reply (or post) on bottom of the page is line "attach file" and "browse" button.........


simple,isn't it?


anyway,I'm here
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Old 20th May 2006, 10:47 PM   #109
BillWW is offline BillWW  United States
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I've tried attaching photos before, but nothing shows up on the board. Do I have to have a photo account?

Bill
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Old 20th May 2006, 10:50 PM   #110
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Quote:
Originally posted by BillWW
Do I have to have a photo account?

Bill

nope;
see next post ;
pic is on my desktop
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