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Old 16th April 2008, 12:44 AM   #121
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Quote:
Originally posted by Dennis Hui


I wasn't too thrilled with the ordering page either.
However, the lure of the F5 was too great, so I
went ahead.

I had ordered late at night and I received a
confirmation the following day via email.

Cheers,
Dennis

The TAA Audioxpress organization is very small and has always relied on simplicity. the original mag was printed on what appeared to be cheap paper run through a photo copier. Still it was great! If they say they got your subscription you will get the mag. They just dont move to quickly. Go to Peterborough , NH sometime --you'll see why!
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Old 16th April 2008, 12:44 AM   #122
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If you don't pick up enough from this thread, www.firstwatt.com
will be posting it after a while.
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Old 16th April 2008, 01:16 AM   #123
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Quote:
Originally posted by apassgear


And what is Nelson’s suggestion on PSU filtering?


Papa says that ordinary unregulated PSU will work fine.
And, if we need suggestion, he would suggest ZV5 or ZV3 types.

I would suggest ZV5 type based on my experience with respect
to the "soft start" and the lower "modulation at low frequency".


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Old 16th April 2008, 01:30 AM   #124
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Quote:
Originally posted by sandstorm33



The TAA Audioxpress organization is very small and has always relied on simplicity. the original mag was printed on what appeared to be cheap paper run through a photo copier. Still it was great! If they say they got your subscription you will get the mag. They just dont move to quickly. Go to Peterborough , NH sometime --you'll see why!
Now that just isn't true -- it wasn't slick like "Audio" or "Radio and Electronics" or the ham radio magazines like QST, CQ or Ham Radio, but it certainly wasn't produced on a mimeograph or Xerox either -- I have every issue going back to 1970 -- and you would be surprised by the folks who contributed "in their youth" -- and are on DIYAUDIO.

Peterborough NH was pretty famous for some very fine magazines "in the day".

Click the image to open in full size.
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Old 16th April 2008, 02:29 AM   #125
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Quote:
Originally posted by jackinnj
I have every issue going back to 1970
Me too

dave
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Old 16th April 2008, 05:06 AM   #126
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Quote:
Originally posted by jackinnj


Now that just isn't true -- it wasn't slick like "Audio" or "Radio and Electronics" or the ham radio magazines like QST, CQ or Ham Radio, but it certainly wasn't produced on a mimeograph or Xerox either -- I have every issue going back to 1970 -- and you would be surprised by the folks who contributed "in their youth" -- and are on DIYAUDIO.

Peterborough NH was pretty famous for some very fine magazines "in the day".

Click the image to open in full size.

You misread my intention..The Mag was great and Peterborough was a Publishers Colony...Content was most important and the contributors were (and are) the creme dela creme.. Odd you chose the Twin Twenty issue... mine is still in use in Rhode Island.
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Old 16th April 2008, 07:37 AM   #127
Vix is offline Vix  Yugoslavia
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Quote:
Originally posted by Nelson Pass


The charm of the buffer will perhaps not be appreciated without the
text commentary that comes with it. A little patience will be
required.

Nelson, thanks for posting the F5 schematic. It was a surprise. Sure, it's much more fun to read the article, but even a schematic is highly appreciated. Now that we have F5 here being the main topic, it's worth waiting for the buffer...( As you once said,it's better to concentrate on one thing at a time)...

Best Regards,

Vix
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Old 16th April 2008, 08:31 AM   #128
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Thanks Nelson for the schematic and everyone else for their very useful comments. Nelson is a genius - and he is now talking about tweeks for the F5!! But what generosity!! Thanks a lot again.
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Old 16th April 2008, 11:29 AM   #129
zinsula is offline zinsula  Switzerland
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Default Balaced alternative

Conceptually, this should work, even if there is no balanced source (pre) available.
"Current Feedback" to the sources of J-Fets, as the F5. Don't know if it would count as X-ed in this case.

Anyone to comment?

Deriving the "voltage feedback" solution (as per susy patent, to the gates) will be trivial for you a-Pass-ionados.

Ciao, Tino
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Old 16th April 2008, 01:12 PM   #130
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Default Re: Balaced alternative

Quote:
Originally posted by zinsula


Anyone to comment?

The cross line does not exchange any signal voltage between the
left and the right. The reason is that the cross line is an potetial
zero point which is always the centre of vertically symmery in any
case with respect to the electrical potential. Just a thinking . . .
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