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Old 11th December 2006, 05:49 PM   #1
Nordic is offline Nordic  South Africa
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Question 1971 Plastic Tiger

http://www.swtpc.com/mholley/Popular...PE_Oct1971.htm

I found this project and it looks realy easy... no thinking required... I need one like that for a change.

Prolem is, 3 of the transistors are no longer freely available.
So, I would like the silicon gurus out there if there may be alternatives I could use to the following.

schematic : http://www.swtpc.com/mholley/Popular..._1971_Pg28.jpg

So, I would like the silicon gurus out there if there may be alternatives I could use to the following.
1. SS1122
2. SS1123
3. MPS6566

Thanking you in advance.
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Old 11th December 2006, 05:57 PM   #2
SY is offline SY  United States
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Keep a fire extinguisher handy.
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Old 11th December 2006, 06:19 PM   #3
edl is offline edl  Hungary
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Quote:
Originally posted by SY
Keep a fire extinguisher handy.



Nordic,

SS1122 = 2n5415, 2n5416

SS1123 = 2n3439, 2n3440

MPS6566 = bc182, bc546
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Old 11th December 2006, 06:22 PM   #4
Nordic is offline Nordic  South Africa
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Cool, I smoked my first transistor today....
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Old 11th December 2006, 07:26 PM   #5
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Default Beautifull to remember...thank you very much Nordic.... alike a treasure to me


You made me very happy with the link you provide.

We can fix here or there to avoid the fire extinguisher...for sure.

Dear Epupa will say to me...as usual:

"Be happy with you basket full of sheet..of papper of course.... and really, this will fill my basket till the top, with sheets of papper previously printed to read with joy!"

hehe

regards,

Carlos
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Old 11th December 2006, 07:48 PM   #6
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Default Nordic...common transistors will work fine there


Q5-BD139C
Q6-BD140C
Q1,Q2,Q4 and Q9- BC546
Q3-BC556

I think they may work fine with those...also the output can be replaced by TIP3055 and TIP2955

I think that voltage amplifier and mirror will need a capacitor from colector to base (Miller)...33J

It is a good idea to include small capacitors into the drivers too..from base to coletor (10J)

From the first transistor base to the feedback one, a series of 100pf and 100 ohms will be nice.

Small capacitor (100N) in parallel with D1

The inclusion of rail resistors (2) of 47 to 100 ohms, and filters also, to input DC voltage.

regards,

Carlos
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Old 11th December 2006, 08:16 PM   #7
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Tiger, Tiger, burning bright
In the forest of the night,
What immortal hand or eye
Could frame thy fearful symmetry?
In what distant deeps or skies
Burnt the fire of thine eyes?
On what wings dare he aspire?
What the hand dare seize the fire?
And what shoulder and what art
Could twist the sinews of thy heart?
And, when thy heart began to beat,
What dread hand and what dread feet?
What the hammer? What the chain?
In what furnace was thy brain?
What the anvil? What dread grasp
Dare its deadly terrors clasp?
When the stars threw down their spears,
And water'd heaven with their tears,
Did He smile His work to see?
Did He who made the lamb make thee?
Tiger, Tiger, burning bright
In the forests of the night,
What immortal hand or eye
Dare frame thy fearful symmetry?

William Blake (1757-1827)
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Old 11th December 2006, 10:07 PM   #8
Nordic is offline Nordic  South Africa
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The last paragraph does say it got hot under testing but not during regular listening, also the building instructions have some thermal management instructions.
Click the image to open in full size.

Thanks Uncle Carlos, I found somme specs for the mps6566, it seems closer to 2n222 except being 10v as opsed to 5.
Oh well those are cheap enough to try a few I guess...
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Old 11th December 2006, 10:15 PM   #9
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Default I am sure that a lot of old folks are happy to see those ancient things


This magazine was nice....you gave an enormous gift to us.

You have made my day Nordic...also Graham Maynard is watching...also John Mateus amd many others.

John told me that was the first amplifier the made in this life.

hehe

thank you,

Carlos
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Old 11th December 2006, 10:22 PM   #10
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The original tigers were way ahead of there time. but had many problems. Audio Amature did a rebuild of these and talk about many of the problems. like the Bias resistor stack being underated, the use of inferior PECOR brand transistors etc.

Zc
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