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Old 31st October 2010, 03:42 PM   #1021
Mitchel is offline Mitchel  Brazil
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Hello Roby,

You can use 4 x 10.000uF capacitors on the power supply unit, nothing wrong with that. Maybe a little overkill, but that's what I use here too! (the PCB looks nicer this way!)
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Old 31st October 2010, 04:15 PM   #1022
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Desoldered all the BD139-140 trannies none is broken.Gonna desolder all the BC trannies to be shure.

Last edited by meanman1964; 31st October 2010 at 04:21 PM.
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Old 31st October 2010, 04:26 PM   #1023
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Default I am reading with all interest

I do feel pain when these things happens.... i do loose my peace.

regards,

Carlos
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Power supply; ripple, filter, noise, stability and the use of capacitance multiplier... Portuguese and English; https://www.youtube.com/watch?v=sSm0ku1eIgg
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Old 1st November 2010, 11:58 AM   #1024
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Eureka!!!Problem solved amp is back alive.Q6 is the one that died.What could be the reason for his dead?
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Old 1st November 2010, 12:38 PM   #1025
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Carlos come online on yahoo

Lets have some talk

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Old 1st November 2010, 01:04 PM   #1026
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Default All right Worhorse...i will search for you.

Meanman

Are you using 220 ohms into Q6 emitter (Dx Blame ST) or using 100 ohms (Dx Blame ES)?

I have assembled several amplifiers without Q6 burning..so..you have something wrong in your amplifier and Q6 will burn once again if you force it to operate into clipping..... i suppose you are using 100 ohms into Q6 emitter.... let me know if you using 100 ohms please.

The Dx Blame ES was considered not safe...not supported, not suggested and not guaranteed..because 100 ohms there is dangerous.

Take some time and read the thread, the Blame ES and Blame ST and you gonna see these transistors are not burning...your case is exception, so i do think you may have a remaining error..and it will burn once more till you discover what is wrong on it.

Try 2N5551 instead of BC546...maybe your BC is a generic fake one....but ATTENTION!... the 2N5551 has emiter and colector inverted..so..you must install it turning 180 degrees related the BC546 insertion position...leads are not the same!

regards,

Carlos
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Power supply; ripple, filter, noise, stability and the use of capacitance multiplier... Portuguese and English; https://www.youtube.com/watch?v=sSm0ku1eIgg

Last edited by destroyer X; 1st November 2010 at 01:07 PM.
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Old 1st November 2010, 01:42 PM   #1027
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I use 220 Ohm for the Q6 emitter resistor

Last edited by meanman1964; 1st November 2010 at 01:44 PM.
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Old 1st November 2010, 02:09 PM   #1028
AndrewT is offline AndrewT  Scotland
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Q6 will be damaged if the amp is overloaded.
Q6 needs the protection of a resistor between Collector and Power Ground.

The value of R16 determines the quiescent current through Q6. It has almost no effect on the fault power when 35V potential is driving current through Q6.

This was brought up many posts ago and DX refused to take in the information and went HIS OWN way saying I and others have nothing to contribute.
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Last edited by AndrewT; 1st November 2010 at 02:32 PM.
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Old 1st November 2010, 02:25 PM   #1029
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Default So, check your amplifier for mistakes.

Several guys have assembled... no one had troubles..so, i cannot accept the amplifier have design troubles and no modification will be made.

Some guys wants to see defects because they want that...maybe the defect is in themselves, not the amplifier...i have tortured amplifiers....there's absolutelly no problem on it.

Mr. AndrewT will return to ignore list because is re starting to provocate Uncle Charlie and i will not be answering him anymore.

regards,

Carlos
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Power supply; ripple, filter, noise, stability and the use of capacitance multiplier... Portuguese and English; https://www.youtube.com/watch?v=sSm0ku1eIgg

Last edited by destroyer X; 1st November 2010 at 02:37 PM.
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Old 1st November 2010, 02:45 PM   #1030
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Quote:
Originally Posted by AndrewT View Post
Q6 will be damaged if the amp is overloaded.
Q6 needs the protection of a resistor between Collector and Power Ground.

The value of R16 determines the quiescent current through Q6. It has almost no effect on a fault power when 35V potential is driving current through Q6.

This was brought up many posts ago and DX refused to take in the information and went HIS OWN way saying I and others have nothing to contribute.
NO effect on the sound , but can "save the day" (below) ,It is easy to add .. worst case scratch a trace in half , add it. Don't feel bad , I missed it on early amps , will add at least the pads (for resistor) , on future ones. It is hard for me to clip at 75V.
OS
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