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John Curl's Blowtorch preamplifier part II
John Curl's Blowtorch preamplifier part II
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Old 13th March 2013, 03:27 PM   #36651
gpapag is offline gpapag  Greece
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John Curl's Blowtorch preamplifier part II
Quote:
Originally Posted by john curl View Post
It is funny, in a perverted sort of way. I use thick aluminum and I am attacked for wasting money and material.

Twisting words and meanings in a perverted sort of way. Just enough for to convince yourself that in this site you are attacked instead of being praised (or “believed”).

George
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Old 13th March 2013, 03:45 PM   #36652
vacuphile is offline vacuphile  Netherlands
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Originally Posted by simon7000 View Post
Clever,

Scott,

Just for you http://www.jensen-transformers.com/as/as019.pdf This started life with an NE5534 and seems some one just plugged in a newer chip. However when I built one it didn't work correctly. So I'll leave it open as to how many folks can suggest how to improve this circuit.

ES
I really don't understand why you would need a DC servo (even two) in this transformer coupled setup. You can null any DC offset using pins on the AD797.
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Old 13th March 2013, 03:54 PM   #36653
scott wurcer is offline scott wurcer  United States
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Quote:
Originally Posted by simon7000 View Post
Scott,

Just for you http://www.jensen-transformers.com/as/as019.pdf This started life with an NE5534 and seems some one just plugged in a newer chip. However when I built one it didn't work correctly. So I'll leave it open as to how many folks can suggest how to improve this circuit.

ES
Elaborate on didn't work correctly. I helped Mitch Cotter with a similar problem (if it's what I think). You need a turn on catcher for the Ib comp network (the one the user can't see).
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Old 13th March 2013, 04:03 PM   #36654
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Mr. Cheesy Weezy in the little Squeezy,

might as well take the opportunity to inquire what your stance is on DC servoing ?
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Old 13th March 2013, 04:05 PM   #36655
john curl is offline john curl  United States
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Gpapag, you don't need to be insulting to me specifically. I expressed my criticism in general, from my point of view.
I do my best to put up with, as well as understand any criticism put up here.
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Old 13th March 2013, 05:33 PM   #36656
gpapag is offline gpapag  Greece
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John Curl's Blowtorch preamplifier part II
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Originally Posted by john curl View Post
Gpapag, you don't need to be insulting to me specifically. I expressed my criticism in general, from my point of view.
I do my best to put up with, as well as understand any criticism put up here.
You made me ring the bell.
When it comes to thick aluminium for front panels, there are many out there (cosmetics and “feel”).
The possible technical reasons for mm of aluminium in home audio gear have been discussed here for good and in a technical manner.
The “aviation grade’ and the tens cm thickness were criticized.
RF sections in avionics (antennas input) and broadcasting (“ball receivers” within repeater stations) have to be housed into chambers and channels machined into billets of aluminium. But there, the RF fields for which the electronics are to be shielded from, measure in kV/m

George
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Old 13th March 2013, 05:53 PM   #36657
scott wurcer is offline scott wurcer  United States
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Quote:
Originally Posted by jacco vermeulen View Post
Mr. Cheesy Weezy in the little Squeezy,

might as well take the opportunity to inquire what your stance is on DC servoing ?
Me? I'm neutral.
Attached Images
File Type: jpg cheezwhiz.jpg (11.4 KB, 172 views)
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Old 13th March 2013, 05:57 PM   #36658
Esperado is offline Esperado  France
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Beurk !
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Old 13th March 2013, 06:15 PM   #36659
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Originally Posted by RNMarsh View Post
some simple things can help in certain places for certain issues:

What else can be done?

Attachment 335733


Thx-RNMarsh

Well, you could flip it around if you're on 120vac mains with a dual 120vac primaries. In either event, you'd be in 'violation' of Menno Vanderveen's US patent # 6087822. This is used in the Torus conditioners from Bryston.
It worked quite well on the primaries of an overspecified r-core powering a dac.

Last edited by pmkap; 13th March 2013 at 06:21 PM.
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Old 13th March 2013, 06:31 PM   #36660
jneutron is offline jneutron  United States
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Originally Posted by gpapag View Post
But there, the RF fields for which the electronics are to be shielded from, measure in kV/m

George
kV/m????



Ah, ok...you're talking about standby mode...

jn
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