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Old 14th May 2008, 08:21 AM   #1
kalmara is offline kalmara  Bulgaria
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Default What amp can I construct with KU606 ?

I have a bunch of original Tesla TO3 devices sitting here, and as much as I hate mounting to3's, I would like to make them of some use. I couldn't find any datasheet, but in a book I have I saw that they are NPN's rated at 120V, 8A, 50W. What can I do with them ... maybe a quasi-complementary design ? Wich one EASY and simple would you refer to me... I have six devices :
Click the image to open in full size.
Also - I have one pair of KD607/KD617 (80V, 10A, 70W), and one pair of KD503 (80V, 20A, 150W). The 503's are connected with the first question, but what about the low power complementary pair 607/617? For the power supply I have one 2x22V transformer, and one 2x31V. Probably about +/-30 and +/-42.

Thank you for your attention.
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Old 14th May 2008, 11:06 AM   #2
e-mos is offline e-mos  Norway
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what about this?

http://www.tcaas.btinternet.co.uk/index-1.htm

I built one for my self some time ago and it works really well.
the output transistors are not critic use any colour u like.

I used the very common 2n3055 and it works..
attention though to the heat this needs a BIG heatzink

this is a very simple amp and there maight be some room for experiments.
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Old 14th May 2008, 11:12 AM   #3
PMA is online now PMA  Europe
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Forget the KU606!!!!

Long ago we did not have acces to normal transistors, and we had just these our old Teslas. This is a switching, highly nonlinear transistor, extremely sensitive to 2nd breakdown! I can ship you a truck of them, if you wish.

KD607/617 are a bit better, but nothing to call home about. They are for linear purposes.
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Old 14th May 2008, 06:34 PM   #4
wg_ski is offline wg_ski  United States
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At least they probably aren't fakes.
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Old 14th May 2008, 07:11 PM   #5
PMA is online now PMA  Europe
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That is very true !

But they are really no good, believe me. The KD607/617 is quite usable, and is not a fake as well. Also KD503, KD504.
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Old 14th May 2008, 07:19 PM   #6
PMA is online now PMA  Europe
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You know, KU606 is a MESA-epitaxial transistor technology.
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Old 15th May 2008, 03:24 AM   #7
wg_ski is offline wg_ski  United States
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For +/-42V, I'd just find a couple pairs of 3055's or 3772's, select for 100V VCEO and be done with it. Drive 'em with TIP41/42C.

If you want better performance than that, hold out for some sustained-beta Jap devices.
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Old 15th May 2008, 03:55 AM   #8
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I hate mounting TO3's just like you, and by looking at the lower power rating of most of those, it may be more sensible to use some nice Flat-Pack transistors instead. Also, if you already have TO-3 heatsinks, you can mount 2 plat-pack devices in the place for one TO-3, using the two mounting screws, and saving heatsink space for other parts.

I do like to use extra TO-3's for non-heatsinked projects, like small voltage regulators or power supply components. You can get them red-hot and they don't die.
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Old 15th May 2008, 09:51 AM   #9
kalmara is offline kalmara  Bulgaria
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Thank you for your replies, I really appretiate it! So the KU's are definetly out of the question, all that is left are the KD607/617 and the two KD503's. About the last post - you are absolutely correct, but genuine flat-pack toshiba devices are reeeeeeeally hard to find here ... almost impossible. Can I use the 607/617 with the Rod Elliot Project 03 ? (or 3A) with +/-42V power supplies ? As far as I know the voltage rating of the output devices has to be the sum of the power supplies, beacause at power-on the whole voltage is dropped over one of the two outputs, is that correct ?

That is for the first KD's. Wich quasi-complementary circuit would you refer to me for the second ones - the KD503's ? And do they have a complementary brother ?
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Old 15th May 2008, 11:16 AM   #10
PMA is online now PMA  Europe
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Quote:
Originally posted by kalmara
but genuine flat-pack toshiba devices are reeeeeeeally hard to find here ... almost impossible
I thought you entered EU?
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