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Old 3rd February 2010, 05:50 PM   #431
juluska is offline juluska  Ukraine
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Originally Posted by sangeet2 View Post
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I think probably you have changed the transistor pins. This letters E and B next to Q5 refers to emitter and base? I think is wrong. Follow the E-C-B indications of this photo.
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Old 3rd February 2010, 06:14 PM   #432
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Originally Posted by juluska View Post
I think probably you have changed the transistor pins. This letters E and B next to Q5 refers to emitter and base? I think is wrong. Follow the E-C-B indications of this photo.
nono, i put in the transitor like indicated...if i would have messed with it, smoke would have come up again ;-)
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Old 4th February 2010, 02:05 AM   #433
Ruwe is offline Ruwe  Europe
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Originally Posted by sangeet2 View Post
I measure at the Output of the Amp now about 10V DC!

Are the input and the output grounds tied together?
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Old 4th February 2010, 03:04 PM   #434
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My Earth from IEC Socket goes to the screw which keeps the Transformer to the enclosure. From there a lead goes to the ground input of the power components.
Also the green and yellow leads from my transformer go to this screw.
From the output of the power components the other ground goes to the amp board.
It looks pretty similar then on your Amp.

I just put in the other amp board. There I am also measuring about 10 Dc V at the Output to the ground

At the moment no Input or Output sockets are connected...

Last edited by sangeet2; 4th February 2010 at 03:34 PM.
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Old 4th February 2010, 05:32 PM   #435
john65b is offline john65b  United States
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Do you have continuity from speaker ground to input ground?

The green and yellow wire from transformer go to the Chassis ground?
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Old 4th February 2010, 06:11 PM   #436
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Not sure if I understand you right...
But if i take an Ohm meter i have connection from chassis ground to the ground of the amp board. The green and yellow leads from my transformer also do have connection to chassis ground.
As stated before in 434, I did neither connect an input or output socket.
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Old 5th February 2010, 01:22 AM   #437
Ruwe is offline Ruwe  Europe
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Originally Posted by sangeet2 View Post
My Earth from IEC Socket goes to the screw which keeps the Transformer to the enclosure. From there a lead goes to the ground input of the power components.
Also the green and yellow leads from my transformer go to this screw.
From the output of the power components the other ground goes to the amp board.
It looks pretty similar then on your Amp.

I just put in the other amp board. There I am also measuring about 10 Dc V at the Output to the ground

At the moment no Input or Output sockets are connected...
The point is that on these boards the input and output grounds are disconnected.
When you say "connected to the power components ground", I understand that you're talking about the output (speaker) ground.
Have you checked, as John65b suggests, the continuity between the input ground (where the input cable shield goes) and your "power components ground"? They must be connected.
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Old 5th February 2010, 07:44 AM   #438
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I guess a picture is worth more then my english ;-)
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Old 5th February 2010, 08:16 AM   #439
juluska is offline juluska  Ukraine
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Originally Posted by sangeet2 View Post
I guess a picture is worth more then my english ;-)
żare the secondary wires of the toroidal correct? What is the exact model of this toroidal? Are the secondaries red-yellow-blue-green?
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Old 5th February 2010, 09:07 AM   #440
Ruwe is offline Ruwe  Europe
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Originally Posted by sangeet2 View Post
I guess a picture is worth more then my english ;-)
These boards are different topology than mine. Why don't you attach the schematic so we can see the components numbers. It would help if you mark the DC voltages that you measure. Not only at the output but everywhere on the board.

Is the same problem on both channels?

I suspect that you may have a problem in the differential pair on the input. These are the transistors that maintain the 0V output (...assuming that your output transistors are OK)

Are you sure the resistors in the base of the differential pair are correct values? You should have 27k in the feedback path and something that gives you a sum of 27k on the input. I've seen combinations of (24k+2.7k) or (22k+4.7k).
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