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Old 1st December 2015, 12:27 PM   #1
zedda is offline zedda  Italy
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Default Carlsbro powerline 2000 possible modding?

Hello everyone

I have a carlsbro powerline 2000 (1000 watt x2 4 ohm load)

It is similar to thomann t.amp 2400mkx or some copy...

I want to post some photo.

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18 toshiba transistor for channel

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Rubycon caps and nichicon caps on signal

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The emitter resistor are 0.33 ohm
It's possible to change this to 0.22 ohm 5w 2%?

What type of mod can I make?
It's possible to make it stable into 2 ohm load?

Thanks a lot
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Old 1st December 2015, 12:48 PM   #2
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Why would you want to do that? The output stage is designed with over current protection in mind. Changing the value from 0R33 to 0R22 will mean a redesign of the bias and detection circuit.
It is not designed for 2R load as the power transformer will not handle the excess current.
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Old 1st December 2015, 12:53 PM   #3
zedda is offline zedda  Italy
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Hy! Thanks for the reply

I want do this because I want more speaker control.
The bias regulation isn't a problem because I can reset this with a rigol oscilloscope.

I do the same on a monacor sta700 (0R50 to 0R27 and it has the same transistor)

You know some type of possible mods?

Thanks a million
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Old 1st December 2015, 03:16 PM   #4
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These kinds of amps tend to have ample damping factor as-is. Open-loop output impedance is only a fraction of an ohm open-loop, and feedback brings that down to negligible levels. Mid-low frequency output impedance is usually limited by output inductor resistance.
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Old 1st December 2015, 04:47 PM   #5
zedda is offline zedda  Italy
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Thank you Sgross
What do you mean for inductor resistance?
Inductor of the amplifier?

You mean the small inductor and the small resistance near the output connector?

Or you mean the resistance of the cable,connector,etc?

My english is very obsolete

Last edited by zedda; 1st December 2015 at 04:49 PM.
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Old 1st December 2015, 06:00 PM   #6
JMFahey is offline JMFahey  Argentina
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Do yourself a favor and leave as is, and use as intended.

If you need more power to drive extra speakers , get another.

If you want to save money, get a second hand one or from a cheaper brand, same specs.

Otherwise we'll meet again here, in a Month or two, in a thread called "HELP !!!!! I blew my Carlsbro Powerline 2000 !!!!! "
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Old 1st December 2015, 06:02 PM   #7
JMFahey is offline JMFahey  Argentina
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Leave as is and use as intended.

Remember it won't blow on the bench or testing at home, but in the middle of a VERY important show.
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Old 1st December 2015, 06:55 PM   #8
zedda is offline zedda  Italy
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Thank you for advice JMFahey
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Old 20th December 2015, 11:49 AM   #9
zedda is offline zedda  Italy
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hello everyone

where installing this type of circuit?

Mains DC and Transformers

https://maurmun.wordpress.com/2013/0...000-amplifier/
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Old 24th December 2015, 04:43 PM   #10
zedda is offline zedda  Italy
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there is 4 different main board

1)input/output
2)rectifier/caps
3)main board left
4)main board right

I want eliminate the first board because there is some useless function i don't need...

from 1 to 3/4 there is triple way cable non-shielded called "+/- input"
I think it's the real input to convert to unbalanced

infact

there are another two cable shielded (non balanced, but triple) from pots to 3/4 whit a 10uF caps for uncople the DC...

but near the "bridge, parallel,stereo" selector on the input board, there are three mono cable shielded...
two go on the left channel (one red and one white), and the last one go on the right channel (yellow)...

i think the white cable on the left channel serve to send the inverted or the parallel signal

how to delete these three cable?

I need only stereo mode...

meanwhile I rewired and twisted the power section
and I installed a new 3x2,5mm cable for the 230v

p.s. when I set "ground" on the rear selector, the cabinet, the earth of "+/- input" and the earth of pots cable are connected... This means I could use it directly with unbalanced signal

Last edited by zedda; 24th December 2015 at 05:09 PM.
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