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-   -   Krell KSA 100 schematic, resistor value question (http://www.diyaudio.com/forums/solid-state/14902-krell-ksa-100-schematic-resistor-value-question.html)

blueman 8th May 2003 12:43 PM

Krell KSA 100 schematic, resistor value question
 
2 Attachment(s)
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 :o
Thanks in advance,
Chinh.

jam 8th May 2003 12:46 PM

475 ohms.

Jan Dupont 8th May 2003 12:50 PM

Yes! 475 Ohm is the correct value :checked:

JOE DIRT® 8th May 2003 01:50 PM

470 ohms would be a safe bet....475 ohms is not a standard resistor

Philo 8th May 2003 03:58 PM

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. :)

UrSv 8th May 2003 04:16 PM

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...

K-amps 18th February 2004 04:00 PM

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 :D 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! :shhh:

-K

Morello 18th February 2004 04:07 PM

20log(1+12k/475)=28.4dB gain

:cool:

MikeW 18th February 2004 10:25 PM

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?

K-amps 18th February 2004 10:36 PM

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.

Chocoholic and Millwood, did I make you proud? :D

K-Amps


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