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Old 15th June 2013, 02:04 PM   #1971
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Quote:
Originally Posted by carsten.witt View Post
Hello together,

Please, see next answer (last sentence).


I don't know how much it is, Alex said it to me but i don't remember.

So, i asked Alex via mail and wait for a respond. Some other pics from Alex.
Wow that is HUGE!!! too bad the blades of the heat sink are horizontally, I think it will dissipate heat faster and easier if the blades are vertically.
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Old 15th June 2013, 02:10 PM   #1972
tinitus is offline tinitus  Europe
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Originally Posted by boywonder View Post
Hi Andrew: I'm not sure I'm following you here....what can I do differently at the RCA sockets?
its fine

Im more worried that the long brass connectors could touch each other if one accidentally loosens and turn

very nice clean amp
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Old 15th June 2013, 02:16 PM   #1973
6L6 is offline 6L6  United States
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Quote:
Originally Posted by AndrewT View Post
Have a look at the aerial loop in the Signal wiring at the RCA sockets.
You must reduce that loop area considerably.
He is using shielded wire and it goes directly to the inputs of the amp PCB...

I'm not entirely sure how it could be made shorter... Am I missing something?
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Old 15th June 2013, 02:17 PM   #1974
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Originally Posted by boywonder View Post
My F4.....it's been done awhile, just got around to snapping a few pics.
Very nice job! I think AndrewT is saying the RCA terminal are a little wider open than it should be. I do not think that is too much to worry about, as long as amp does not have any "back noise" all should be fine! I always use triple shielded microphone wire to connect the inputs and I have not encounter any problems with any back noise. so far..so good!
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Old 15th June 2013, 04:41 PM   #1975
bcmbob is offline bcmbob  United States
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Andrew, Is this what you are calling a loop? Through the negative/ground?
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Old 15th June 2013, 05:26 PM   #1976
AndrewT is offline AndrewT  Scotland
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Originally Posted by bcmbob View Post
Andrew, Is this what you are calling a loop? Through the negative/ground?
not that.
Look at the back of the RCA socket.
The shield is connected via a wire that is then soldered to the solder tag.
Look at the gap between the Signal wire and the grounding wire.
That gap is a loop. It picks up interference.

The loop can be made at least ten times smaller in area and with care maybe even reduced to 1% of the existing area.

Bare a tiny bit of signal and insert such that the screen nearly touches the free end of the RCA. Solder the signal to it's receptacle. Solder the screen to the end of the RCA using a tiny length of strand from a multi-strand core. If you are really careful you could try to solder 4 strands around the end of the RCA stub arranged at 90. These extra strands contact the screen around the periphery of the screen.
Until I read Ott, I had not realised how important the complete circumference of the screen is to making the screening effective.
Ott repeatedly tells us to NOT use a screen pigtail.
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Old 15th June 2013, 06:31 PM   #1977
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Hi AndrewT are you talking about this in the "coaxial cable"?Extron Electronics - Answer: Hum, Buzz, and Ground Loops
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Old 15th June 2013, 07:59 PM   #1978
AndrewT is offline AndrewT  Scotland
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fig5 shows and notes the problem.
The area between the pigtail and the signal must be minimised.
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Old 16th June 2013, 06:17 AM   #1979
AndrewT is offline AndrewT  Scotland
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I should have added that the screen should extend all the way to the connector.
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Old 16th June 2013, 01:37 PM   #1980
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Quote:
Originally Posted by duder1982 View Post
Nice and clean boy, where did you get that chassis.
Duder: I built it using HeatsinkUSA 10.80" heat sinks, and aluminum angle and plate from a local metal supply house.


Quote:
Originally Posted by AndrewT View Post
I should have added that the screen should extend all the way to the connector.
Hi Andrew: The screen/braid is tinned and soldered to the ground tab (no lead wire), but I suppose that I can make that entire joint a smaller "loop".
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