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Old 8th February 2004, 10:48 PM   #1
GAK is offline GAK
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Unhappy tube based CCS

Hi
Any good source for tube based CCS?
Thanks
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Old 9th February 2004, 12:10 AM   #2
EC8010 is offline EC8010  United Kingdom
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Just use a pentode with an undecoupled cathode resistor. If you make the control grid positive, you can use a larger cathode resistor, which is then multiplied by the pentode's enormous mu.
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Old 10th February 2004, 01:56 AM   #3
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I'm about to try this, in the tail of an LTP 6SL7 phase-splitter, using a 6AU6 (petode). It seems to be straightforward enough, except that a tube CCS needs quite a high voltage compared with solid state. Hopefully it sounds better, though!
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Old 10th February 2004, 03:19 AM   #4
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Quote:
Originally posted by EC8010
Just use a pentode with an undecoupled cathode resistor. If you make the control grid positive, you can use a larger cathode resistor, which is then multiplied by the pentode's enormous mu.
I just finished reading the triode/pentode CCS section in Morgan Jones book -- his description seemed a bit more involved....

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Old 10th February 2004, 04:16 AM   #5
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Probably striving for perfection then. Ain't needed. The same approach works fine in SS, biasing the "grid" (gate or base) positive (negative for P type) to account for the positive (on NPN and depletion-mode transistors) "grid"-"cathode" potential with a pair of diodes or (for really high quality) a zener.

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Old 11th February 2004, 03:47 PM   #6
GAK is offline GAK
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I think Morgan Jones reffers on a CCS for a PSU.I need a CCS for anode load for a triode line stage.
Like Gary Pimm's CCS.But Gary Pimm has more information about SS CCS.I love tubes and I like a tubed CCS.But I need more information.
The new issue of audioXpress has a nice article!!A triode preamp with EL34 for CCS.
But any new information is acceptable!

Ray_moth:can you post a schematic?
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Old 11th February 2004, 04:29 PM   #7
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Default Details, details...

Using a pentode as a CCS is easy enough, but you need to give some clues as to how much current it must sink, and how many volts are available for its operation. EF91/6AM6 is a possibility, as is EF184/6EJ7.
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Old 11th February 2004, 04:41 PM   #8
GAK is offline GAK
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EC8010 : You have right for this.
I need it for an anode load for a 12B4A line stage.With
Vg -12.5V
Rk 410R bypassed
Ia 30mA
rp 950R
u 6.4
The anode voltage is as much as I need.I haven't order the power transformer yet.

If you want more details let me know.
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Old 11th February 2004, 07:00 PM   #9
EC8010 is offline EC8010  United Kingdom
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Well, it is possible to use a pentode as an anode load, but it's not usually worth it - a high-mu triode is simpler and lower distortion. I'm guessing that Va is about 100V. Your best option is to turn the stage into a mu-follower using a 6C45 triode as the upper valve.
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Old 12th February 2004, 05:58 AM   #10
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may i ask, out of curiosity, why so much idle current? it would seem for most linestage type applications, you could get away with 10mA or even less depending on what your load looks like.

I agree with EC. I think a hi mu triode is practially as good a a pentode and easier to do.

In fact, if you were hanging around in 6922 territory, I think you could make a very respectable mu-follower with two 6922s.
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