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Old 3rd November 2012, 10:57 AM   #2621
generg is offline generg  Germany
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I had no time my wife got fever....
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Old 3rd November 2012, 11:13 AM   #2622
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frankly , sometimes really puzzles me - why I'm here
Somebody has to make a mess for you to fix.
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Old 3rd November 2012, 11:24 AM   #2623
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Old 3rd November 2012, 01:21 PM   #2624
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Quote:
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let's just say that Iq was in 1A55 ballpark

somewhere earlier I gave little table of SJEP tempco at 2A (or something like that ) , so I'm expecting that , on value what I think I heard in Pa's Lecture , it's spot on dead ..... or dead spot on



so , let's Iq be a pulsar , not ookin' Ugs

btw. guys - flocchini didn't asked for Iq measuring procedure , but for expected Iq , for PSU calculus purposes
ZM,
I think I got this number for dissipation in my head from the speech. I am going to match some transistors this weekend.
I think around .75A @ 23-24v ballpark would be best for F6.
Do you agree?
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Old 3rd November 2012, 02:09 PM   #2625
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why not at proper Iq ?

1A5-1A6

if Papa confirms that ......... usual disclaimer is - you heard that from Mighty Moi , so caution is necessary
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Old 3rd November 2012, 02:35 PM   #2626
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I thought that .75 x 2 gets us there. Since two fets gives us 1.5A dissapation. No?
Probably dont have the right thought process down here.
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Old 3rd November 2012, 02:51 PM   #2627
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I had my crappy F6 at 1.5A per fet not per channel. I wonder if that is what ZM is eluding to.
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Old 3rd November 2012, 04:01 PM   #2628
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Do it, it is one of the easiest PTP I made, only thing is to check twice the polarity of the windings to be correct.

@ ZM ISKRA adventure continues tomorrow, my wife has a cold and I have to do the household and some more....
Again a big thanks - I have a pair of Bud P transformers in addition to the Jensens and the windings are different. Wiring to the transformer is an idea I had'nt thought of - would be an easy way to compare transformers - Power supply first then .....

Best

Bob
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Old 3rd November 2012, 04:30 PM   #2629
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I had my crappy F6 at 1.5A per fet not per channel. I wonder if that is what ZM is eluding to.
Okay, so looking at Ohm's law calculator,
P=E x I
23V @ 1.5A = 34.5W
So 69 Watts per channel seems reasonable.
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Old 3rd November 2012, 04:34 PM   #2630
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I had 4 on a Heatsink USA 10.08 profile that was 12" long. It was laying with fins facing down and fets sitting on top, and had no real issue with heat
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