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Old 23rd October 2012, 01:58 PM   #41
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After measuring the Transistor ive got from Frans
i got

HFE BC337-40 BC327-40
420...............3x.............................. ......1x
430...............7x.............................. ......2x
440...............8x.............................. ......4x
450..............10x.............................. ......9x
460..............11x.............................. ....15x
470................8x............................. ......30x !
480................9x............................. ......27x !
490..............10x.............................. ....10x
500................3x
510...............13x
520...............12x
530................4x
257............................................... .......1x
289................1x

Measured on duewi DMT7977

The question now is witch to drop where ?
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Last edited by Benedetto; 23rd October 2012 at 02:03 PM.
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Old 23rd October 2012, 03:11 PM   #42
RCruz is offline RCruz  Switzerland
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Quote:
Originally Posted by pdul View Post
Has anyone found a good technique to keep the insulationpads in place while mounting the powertrannies, without the screws to help?
If you use mica insulators is easier.

Once the power trannies are in place, lift the spring and pull them in with your fingers
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Old 23rd October 2012, 03:15 PM   #43
pdul is offline pdul  Denmark
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I wonder if its possiple to buy the siliconepad as a sheet, so i can put one piece to cover the whole surface?
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Old 23rd October 2012, 03:25 PM   #44
pdul is offline pdul  Denmark
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Quote:
Kerafoll 86/83
Where do you buy this?
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Old 23rd October 2012, 03:47 PM   #45
pdul is offline pdul  Denmark
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Quote:
After measuring the Transistor ive got from Frans
i got

HFE BC337-40 BC327-40
420...............3x.............................. ......1x
430...............7x.............................. ......2x
440...............8x.............................. ......4x
450..............10x.............................. ......9x
460..............11x.............................. ....15x
470................8x............................. ......30x !
480................9x............................. ......27x !
490..............10x.............................. ....10x
500................3x
510...............13x
520...............12x
530................4x
257............................................... .......1x
289................1x
Maybe it would be a good idea to start a transistor trading thread.
I have already traded some with Joachim with great result, got a lot of good pairs out of it.
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Old 23rd October 2012, 03:58 PM   #46
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If one fine day the GB-parts arrive
who knows what value those trannies got...
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Old 23rd October 2012, 04:28 PM   #47
pdul is offline pdul  Denmark
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you already have 8 nice pairs at hfe490 for the inputs of both boards.
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Old 23rd October 2012, 04:31 PM   #48
pdul is offline pdul  Denmark
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Then look at the assemply guide in post 13 to place the rest. Hesener has a very good explanation there about the ishue.
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Old 23rd October 2012, 04:43 PM   #49
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Quote:
Originally Posted by pdul View Post
I wonder if its possiple to buy the siliconepad as a sheet, so i can put one piece to cover the whole surface?

Kerafol 86/83 in my case

Yes I did cut a strip of a load I got. No problem realy fitting it tiny tiny litle bit of therm grease just to stick them there.

One can first Fit midle transistor on sink set to board, place second transistor hold in place take lot out, clamp repeat for 3, .... once al done Just weld in place altrought the welding part has been frown upon a while ago If you find that you will also find picture of clamping device

In which case line up transistors on board, solder then fit sink and clamp even 4 years old can do that

Clamping device I can sell you for 42 or you can look at picture and buy one for 3.50

Got **** load from Keratherm minimum order qty aplies got 550 X350 mm sheet. do not bother with cut shapes as they charge (rape) for tooling as well

I cut strips of 19 mm so can do TO3P TO247 and TO220 by changing orientation of pack.

By the way before you do all this the TO3 close to sink need to go in and have shorth legs or they touch the sink

Last edited by Bksabath; 23rd October 2012 at 04:48 PM.
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Old 23rd October 2012, 04:46 PM   #50
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Quote:
Originally Posted by pdul View Post
you already have 8 nice pairs at hfe490 for the inputs of both boards.
Fine by me but Hi Hfe especialy there on inputs is beterer.

I do not have mine so far but I got a stash from Fairchild and Hfe was sky hi on those.

So question: how do you measure them?

Distribution of Hfe values in theory shuld be a bell shape shape on graph paper where midle ground Hfe got more transistors but this if one get full batch

Last edited by Bksabath; 23rd October 2012 at 04:50 PM.
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