"Mysterious" wire in Krell KSA-50MkII - Page 3 - diyAudio
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Old 23rd July 2014, 03:30 AM   #21
rayma is offline rayma  United States
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Quote:
Originally Posted by LineSource View Post

PERHAPS: A past owner added this switch with the yellow wire and another feedback resistor as a way of setting two different amplifier gains .... two different R8/R9 ratios. i.e. for ONE CHANNEL the switch selects between (a) one resistor = R8; or (b) two resistors in series(or parallel) = R8. This would allow passive Xover circuit bi-amping with different gain for the woofer than for the mid-tweet.
Now that makes some sense. What are the resistor values?
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Old 23rd July 2014, 09:04 AM   #22
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Quote:
Originally Posted by LineSource View Post
This Sunday I went to Church and prayed upon your yellow wire.
God told me that Satan is in that yellow wire!
If you fall to temptation and turn the rear switch, Satan will destroy your speakers!!

If you want your speakers free from Satan, you must perform an Exorcism and remove the yellow wire and restore both channels to the standard wiring+feedback. Never touch Satan's switch!!
Can I get an AMEN!



I have seen several Krell KSA50 and KSA100 amps. None had your rear "switch". Your pictures do not show enough details around the switch to trace the circuit.

PERHAPS: A past owner added this switch with the yellow wire and another feedback resistor as a way of setting two different amplifier gains .... two different R8/R9 ratios. i.e. for ONE CHANNEL the switch selects between (a) one resistor = R8; or (b) two resistors in series(or parallel) = R8. This would allow passive Xover circuit bi-amping with different gain for the woofer than for the mid-tweet.
It seems that only the Mk2 version (fan under the cooling tower and with very thick copper wiring) had the switch on the back:

Click the image to open in full size.

Click the image to open in full size.
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Old 23rd July 2014, 09:23 AM   #23
godfrey is offline godfrey  South Africa
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If there's a switch on the back, I'd expect there to be something about it in the user manual.
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Old 23rd July 2014, 09:36 AM   #24
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The manuals aren't available anywhere
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Old 23rd July 2014, 01:15 PM   #25
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the resitor value is 22K
Attached Files
File Type: pdf krell_ksa-50-mkii_esoteric_dual_mono_classa_pa_sm.pdf (339.6 KB, 40 views)
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Old 23rd July 2014, 01:17 PM   #26
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Yes, I already have the circuit diagram.

I'm starting to wonder if this isn't a kind of bridge switch
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Old 23rd July 2014, 03:14 PM   #27
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Attached: 1-resistor Bridged Amp Topology.


Most bridged amps include an inverting buffer on one input.
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File Type: jpg Bridged Amp.jpg (37.7 KB, 93 views)
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Old 23rd July 2014, 03:39 PM   #28
rayma is offline rayma  United States
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This makes sense. Now we know.
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Old 23rd July 2014, 05:35 PM   #29
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Originally Posted by SonyFan View Post
Click the image to open in full size.
I want one of these! Where'd you find it and what's it called?
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Old 24th July 2014, 06:38 AM   #30
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It's called : "Armageddon USB Hub"

Google it !

Philippe
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