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Old 20th September 2008, 05:02 AM   #11
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Quote:
By Andrew t:The first 5 opamps and the circuitry around them might give you a clue to the lost bass.
I agree .. try bypassing all the opamps ,drive the amp directly
("PA" direct to first stage) WOW ,is this amp huge or what!!
What are the rails at 120-0-120V ???

Also ...C's with ?? marks at input + NFB loop ,what are they???
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Old 20th September 2008, 06:03 AM   #12
mhtplsh is offline mhtplsh  India
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Quote:
I agree .. try bypassing all the opamps ,drive the amp directly ("PA" direct to first stage) WOW ,is this amp huge or what!! What are the rails at 120-0-120V ??? Also ...C's with ?? marks at input + NFB loop ,what are they???
This means no need to keep opamps in the path. Just bypass it.
The amplifier is huge.
I hvn't checked the supply rate.
I will check the value of C in the feedback path.
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Old 20th September 2008, 09:35 AM   #13
jaycee is offline jaycee  United Kingdom
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My money would be that the amp is not the problem - its the speakers. This is why speaker/amp combos for bass guitars have huge speakers usually designed for this sort of work.
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Old 20th September 2008, 11:50 AM   #14
mhtplsh is offline mhtplsh  India
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Quote:
My money would be that the amp is not the problem - its the speakers.
I tried this also.
The same speakers under same conditions give more powerful bass with another amplifier.
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Old 20th September 2008, 11:55 AM   #15
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i agree the amp is not the problem, its the speaker system. why not build a kick bin for that tight and punchy sound. Try this site www.speakerplans.com. Hope this helps.

best regards,
audiomachines
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Old 24th September 2008, 08:12 AM   #16
mhtplsh is offline mhtplsh  India
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ostripper :
Quote:
Also ...C's with ?? marks at input + NFB loop ,what are they???
I located the components. The c? is 100/25v BP. But the resistor in series with it is 1.2k.
This means that the gain is just 20.
I think it will be better to increase the gain to 33.
So i will replace the 24k resistor feedback resistor with 39k.
Plus should i replace 100/25V bipolar with 220/25vBP or more.
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Old 24th September 2008, 10:32 AM   #17
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If you are not needing to have the input level control at max then you don't need more gain. Changing gain will affect the stability of the amp.
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Old 24th September 2008, 11:48 AM   #18
sreten is offline sreten  United Kingdom
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Hi,

Increasing amplifier gain improves stability, reducing gain is the no-no.

/sreten.
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Old 24th September 2008, 03:11 PM   #19
mhtplsh is offline mhtplsh  India
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sreten:
Quote:
Increasing amplifier gain improves stability, reducing gain is the no-no.
So what i am going to do is right. Increasing the gain in limit which is not extended upto oscillation.
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Old 16th September 2010, 02:38 AM   #20
C3PO is offline C3PO  Philippines
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Default t-amp proline 3000

Quote:
Originally Posted by mhtplsh View Post
The amplifier is with heavy duty transformer & power supply. It is used for pa. But there is no powerful bass as required. What modifications might be required to get kick bass for PA use.
hi, is this your amp?
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