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Old 20th December 2009, 12:40 PM   #1
Brit01 is offline Brit01  United Kingdom
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Default Nice! First CCS.

Have never used a CCS before despite members swearing by them.

Hooked up a CCS on the anode of one of my simple common cathode linestages.

Using a SV83 as the CCS. OK maybe inefficient but not worried about that. Getting a nice stable 190V from the CCS.

Very nice indeed.
Bass amongst other things significantly improved.
Never had much success using 6N1P's but now it really shines with the CCS on the plate.

Also replaced the cathode resistor/cap bypass with some yellow leds. Got a perfect 1.85V on both cathodes.
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Old 20th December 2009, 12:52 PM   #2
SY is offline SY  United States
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There's a great synergy between CCS and LED bias, too. Welcome to the Dark Side.
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And while they may not be as strong as apes, don't lock eyes with 'em, don't do it. Puts 'em on edge. They might go into berzerker mode; come at you like a whirling dervish, all fists and elbows.
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Old 20th December 2009, 01:32 PM   #3
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Congrats!

Try a CCS on some "worthless tee vee toobs" as well and you'll hear the magic genie come out of the bottle

Cheers!
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Old 20th December 2009, 01:49 PM   #4
Brit01 is offline Brit01  United Kingdom
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Thxs SY/Geek.

Trying a variety of music and really liking this.

I had an issue with humming before thinking the transformer was damaged, but it seems to have cleared up using the CCS. Strange.

Now to try with some different tubes

But the lady of the house wants to go out

Well an excuse to enjoy my classic alfa romeo and hear those sweet weber carbs singing.
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Old 20th December 2009, 02:08 PM   #5
SY is offline SY  United States
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Using a CCS will dramatically improve the power supply rejection, so that may be why you have less hum.
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And while they may not be as strong as apes, don't lock eyes with 'em, don't do it. Puts 'em on edge. They might go into berzerker mode; come at you like a whirling dervish, all fists and elbows.
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Old 20th December 2009, 03:31 PM   #6
Brit01 is offline Brit01  United Kingdom
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QQ

mu stage

Looking at this article above I see he takes the output of the gain stage between the cathode of the CCS penthode and RK2 (V2's cathode resistor) at the point where the cap is.

I am taking it off from the point below the cathode resistor.

What difference would this make?

So far I'm getting good results. (took the CCS design from Pete Millets low mu amp).
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Old 20th December 2009, 07:55 PM   #7
Gluca is offline Gluca  Italy
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It depends on what you are driving. BTW I did always prefer the plate output. Give solid state CCS a try, you will never come back.

Gianluca
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Old 20th December 2009, 08:17 PM   #8
Brit01 is offline Brit01  United Kingdom
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So I'm assuming we take the output from the plate or above the cathode resistor depending on how hard it is to drive?
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Old 20th December 2009, 11:09 PM   #9
dhaen is offline dhaen  Europe
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I think the cathode point has a much lower impedance, so is preferable.
My amp OnRyoku 845SE does this.
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Old 27th December 2009, 07:12 PM   #10
Brit01 is offline Brit01  United Kingdom
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tweeked design:

my best sounding amp to date.

Correction. R5 is 910 ohms Holco.
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