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Old 1st November 2012, 12:52 AM   #1451
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turn the caps as the outer foil work as shield
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Old 1st November 2012, 06:47 AM   #1452
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PSZ and everyone else - hindsight is always keen... The case on any comupter electrolytic cap is always at the potential of the (-) terminal of the cap, which is one reason why you see them often with plastic sleeving around the case. In the instance of the Rifa long-life computer ekectrolytics with the stud on the bottom of the case, well, that stud is at the same potential as the case/(-) terminal of the cap.This is not a biggie if the cap is used for the usual filtering purposes ( but not for negative supplies, obviously). When used as coupling caps, the mounting stud on the bottom of the cap must be isolated, otherwise you are shorting the amp output to chassis. Obvious in retrospect, but not on Sunday - sheesh...
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Old 1st November 2012, 06:46 PM   #1453
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hum gone, i think it was the grid choke having to big ac impedance and turning my non shielded cable to antenna , i just put a 27K resistor to charge the gate and still have strong bass with a 3.9uF input capacitor , it seems 10uf is a little overkill in this place
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Old 3rd November 2012, 09:24 AM   #1454
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Click the image to open in full size.

somtehing tells me christmas time is coming sooner this year
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Old 3rd November 2012, 04:29 PM   #1455
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Here's something else:

Fun with PASS-SIT-1
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Old 3rd November 2012, 04:47 PM   #1456
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Quote:
Originally Posted by Michael Rothacher View Post
Here's something else:

Fun with PASS-SIT-1
But wow ! Will we be able to purchase some of the PASS SIT-1 this year ?
Can't wait!

s

PS

I did read the news ( and all the article ) . But I keep crossing my fingers .

Last edited by stefanobilliani; 3rd November 2012 at 04:50 PM.
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Old 3rd November 2012, 05:31 PM   #1457
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I wouldn't hold your breath, though.
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Old 3rd November 2012, 05:42 PM   #1458
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michael , i was thinking of our christmas not only yours

Mr pass , what do you want for a pair of these ? (except 5000$ for a SIT2)
drugs, girls,french wine?
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Old 3rd November 2012, 05:50 PM   #1459
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Maybe Nelson bumped his head or something; I don’t know why he’d make me this offer, but believe me, I don’t question it. For me, this was like George Lucas inviting a random fan to Skywalker Ranch to preview one of the Star Wars films. And I don’t mean Phantom Menace.
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Old 3rd November 2012, 07:42 PM   #1460
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Default More fun with PASS-SIT-1

Quote:
Originally Posted by Michael Rothacher View Post
Here's something else:

Fun with PASS-SIT-1



The weight of a TO-247 package is 0.2 oz for a bjt selling for $2; or 10 USD/oz. Do a similar calculation for a PASS SIT-1 transistor [TO 247] and then position it in this following field of precious metals:
  • Au at 1,689 USD/oz
  • Pt at 1,540 USD/oz
  • Rh at 1,150 USD/oz
  • Ir at 1,050 USD/oz
  • Pd at 600 USD/oz
  • Ru at 110 USD/oz
  • Ag at 31 USD/oz
  • SemiSouth R100A at 250 USD/oz
  • bjt at 10 USD/oz
PASS-SIT -1 may be poised to trade in the market of precious metals. It'll easily surpass Silver and may gracefully sit between Ruthenium and Iridium.
The TO-3 metal package [2SB.. and 2SD..bjts] made in Japan weighed ~0.4 oz. The weightliest was ~0.5 oz. Those DIYers who used KD82 are in a position to place this SIT in the above list.

Last edited by Antoinel; 3rd November 2012 at 08:06 PM.
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