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Old 8th May 2003, 12:43 PM   #1
blueman is offline blueman  Viet Nam
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Question Krell KSA 100 schematic, resistor value question

Hi all,
Anybody have experience on DIY Krell KSA 100, please help me for a little. I just wanna know what is the reasonable value of the resistor in the cross distortion in attached schematic.
(which is circled in red): 475 ohm, 4K7 or 4,7M ohm
Thanks in advance,
Chinh.
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Old 8th May 2003, 12:46 PM   #2
jam is offline jam  United States
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475 ohms.
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Old 8th May 2003, 12:50 PM   #3
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Yes! 475 Ohm is the correct value
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Old 8th May 2003, 01:50 PM   #4
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470 ohms would be a safe bet....475 ohms is not a standard resistor
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Old 8th May 2003, 03:58 PM   #5
Philo is offline Philo  United States
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Quote:
Originally posted by JOE DIRT®
470 ohms would be a safe bet....475 ohms is not a standard resistor
Well, maybe not at Ratshack but you can get 475 ohm resistors fairly easily. Digikey and similar distributors sell them.
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Old 8th May 2003, 04:16 PM   #6
UrSv is offline UrSv  Sweden
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Quote:
Originally posted by JOE DIRT®
470 ohms would be a safe bet....475 ohms is not a standard resistor
Doesn't get more standard than that...

However it seems funny to open a thread asking about a resistor that is clearly printed in the diagram...
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Old 18th February 2004, 04:00 PM   #7
K-amps is offline K-amps  United States
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Quote:
Originally posted by UrSv


Doesn't get more standard than that...

However it seems funny to open a thread asking about a resistor that is clearly printed in the diagram...

Who cares At least this way we get to see the "secret" Krell schematics... Pretty average looking if you ask me.

by the way Blueman, if you have more Krell schematics, please feel free to post!

-K
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Old 18th February 2004, 04:07 PM   #8
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20log(1+12k/475)=28.4dB gain

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Old 18th February 2004, 10:25 PM   #9
MikeW is offline MikeW  United States
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Default questions

Has anyone built this amp?
How many output devices?
How much bias?
How does it sound?
Is it worth doing a board for it?
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Old 18th February 2004, 10:36 PM   #10
K-amps is offline K-amps  United States
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Based on the schematic. looks like 3 pairs of outputs. If it runs 100watts class-A into 8 ohms, i'd say the bias is as follows:

Total bias 2.5 amp per rail.
Bias per device 0.84 (x3 devices for each cycle of push pull) .
voltage across each emmitter resistor = 416.6mv.

This amp will dissipate 235 watts per channel at idle.

All this is based on the 100 watt class-A spec and the values on the schematic.

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