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Old 21st November 2017, 09:22 PM   #101
Pars is offline Pars  United States
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As long as the voltage range is sufficient, the OP07 will work fine.
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Old 22nd November 2017, 04:02 PM   #102
idir is offline idir  Poland
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Originally Posted by Pars View Post
As long as the voltage range is sufficient, the OP07 will work fine.
Thank you . I have replaced the OP27 with the cheap OP07. Cannot hear a difference. The main transistor radiators are very hot, as they used to be. Wondering what does the OP amp change in the PSU?
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Old 22nd November 2017, 04:49 PM   #103
Pars is offline Pars  United States
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Default Krell KSA5

I believe it is the error amp in the PSU, and no you wouldn’t hear any difference. These aren’t the type of applications where you “roll” opamps... they either work or they don’t.
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Old 19th December 2018, 03:31 PM   #104
idir is offline idir  Poland
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Originally Posted by Algar_emi View Post
Here the latest tweaks, as I said lowered the supply voltage to +-19V, easily done, simply added 2K on parallel with the reference output volt divider 511R.

Then on the supply added an input CRC filter (4R resistor and second 4700uF cap) to reduced a little the regulator input voltage from 32V to 30V, since I increased the bias current.
That will reduces the pass regulator power dissipation.

That also reduce the amp already low noise floor. Regulator input ripple went from 300mVac to 100mVac...

End result is very nice indeed, excellent amplifier
Could you please show me, how you connected the CRC filter?
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Old 7th September 2019, 06:43 PM   #105
vizion is offline vizion  United States
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Hi, has anyone tried a KSA5 to drive a high efficiency full tower speaker ? How does it compare to an ACA amp ?

Thanks.
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Old 13th September 2019, 08:25 PM   #106
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Hi, has anyone tried a KSA5 to drive a high efficiency full tower speaker ? How does it compare to an ACA amp ?
Thanks.
Isn't the KSA5 a multi-stage complementary transistor design and the ACA a two-stage SE;-? On how bad speakers should the KSA5 sound better;-?
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