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F6 Amplifier
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Old 18th May 2013, 01:15 AM   #4291
jackinnj is offline jackinnj  United States
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Quote:
Originally Posted by buzzforb View Post
I'm "thick as a brick". Don't know what you mean.
Should have put a couple of "AA"'s in series with the gate stepper.

The vertical axis is 2 amps per division. The horizontal is 1V per division.
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Old 18th May 2013, 07:40 PM   #4292
Gyuri is offline Gyuri  Hungary
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This would be a suitable instrument.
I found this in a South-Korean multinational company warehouse in Romania.
They had no idea what it is.
May be some kind of oscilloscope?
Arrgh...
Unfortunately, I may brought it home only to poor quality images.
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Last edited by Gyuri; 18th May 2013 at 07:47 PM.
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Old 18th May 2013, 07:59 PM   #4293
Zen Mod is offline Zen Mod  Serbia
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nice toy ..................

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Old 18th May 2013, 08:25 PM   #4294
Gyuri is offline Gyuri  Hungary
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Here's a word from an electronics multinational company.
Absolution from this sin can only be, they do not use triple-legged parts nowadays, I suspect.

And I have not even mentioned many oscilloscopes, throwed into large paper boxes.
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Old 18th May 2013, 09:00 PM   #4295
generg is offline generg  Germany
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Quote:
Originally Posted by gazzagazza View Post
What is the application you are using for measurements?
Spoken by Tapatalk.

a Mac with Electroacoustic Toolbox....

because there is no visible difference I decided to measure again, I cannot believe it, because I hear a clear difference....
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Old 18th May 2013, 09:44 PM   #4296
buzzforb is offline buzzforb  United States
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Have you looked at phase?
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Old 19th May 2013, 12:17 PM   #4297
generg is offline generg  Germany
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Good idea Buzz will do it!
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Old 21st May 2013, 08:28 PM   #4298
WalterW is online now WalterW  Netherlands
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Quote:
Originally Posted by buzzforb View Post
Just a matter of ordering them from Profusion. Little expensive, but great deal less than SS.
Two I would recommend.
ECW20N20-Z
ECW20P20-Z
Nice, I will order some to try in a F5...
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Old 21st May 2013, 11:19 PM   #4299
kasey197 is offline kasey197
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Tea and others who've built this - how are you finding the offset setting and drift on the F6?
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Old 22nd May 2013, 05:37 AM   #4300
permaneder is offline permaneder  Germany
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Quote:
Originally Posted by kasey197 View Post
Tea and others who've built this - how are you finding the offset setting and drift on the F6?
Bias and offset settings correlate. Once you have found the right balance, both keep very stable after a certain warm-up phase.

My F6 has a total power consumption of between 250W and 260W when started cold and decreases to about 220W after one hour or so. These consumption figures include the losses in the transformers, the rectifiers and in the regulated power supplies.

I built it strictly dual mono with considerably dimensioned heat sinks to achieve a relative constant temperature during its operation time. There is no degeneration of the power JFETs implemented.

Last edited by permaneder; 22nd May 2013 at 05:40 AM.
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