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Krell KSP-7B power supply issue
Krell KSP-7B power supply issue
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Old 17th January 2019, 09:21 PM   #1
df_genius is offline df_genius  United Kingdom
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Default Krell KSP-7B power supply issue

I have a KSP-7B power supply with a dead rail, does anyone have a schematic please? I can't seem to find one anywhere, it seem to be a design they regularly use to get +/-21V. Thanks.
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Old 17th January 2019, 09:46 PM   #2
analog_sa is offline analog_sa  Europe
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Krell KSP-7B power supply issue
Never ever seen a published schematic of a Krell pre. But why do you need a schematic anyway? The PS is just 3-terminal regulator based, isn't it? As straightforward as they come.

EDIT: Just looked at the pics of my old KRC. Not 3-teminal but a circuit with bipolar pass transistors and an opamp. Looks pretty simple, something along the lines of Jung/Sulzer. Can probably draw it from the pics. Is it the same in yours?

Last edited by analog_sa; 17th January 2019 at 09:59 PM.
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Old 17th January 2019, 10:46 PM   #3
df_genius is offline df_genius  United Kingdom
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mine doesn't have an op amp, just four mje15030/1 per rail.
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Old 18th January 2019, 12:38 AM   #4
analog_sa is offline analog_sa  Europe
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Krell KSP-7B power supply issue
So, why do you need a circuit? It is probably just a zener referenced emitter follower and for the purposes of troubleshooting there are very few components to go wrong, mostly the transistors.

Check voltage at base, if present and around 20v, but missing at emitter > check/replace transistor.
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Old 18th January 2019, 01:45 PM   #5
sq225917 is offline sq225917  United Kingdom
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Send a message via MSN to sq225917 Krell KSP-7B power supply issue
Bloody awful PSU and they run them far too hot. Do yourself a favour and replace the small caps with 105 degree parts and snub the diode bridge while you're in there.
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