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Old 30th August 2012, 06:27 PM   #1
milosus is offline milosus  Serbia
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Default cathode follower ecc88 on 60volt

Hello

Pls,i need answer of more expirienced people,is it be good working point of ecc88 like cathode follower on 60 volt on anode and 13 ma cathode current (i need for one experiment with headphone amp) Only thing that i have problem is that that i canot put more than 60 volt on anode,that is maximum and i want to get maximum current.Thanks
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Old 30th August 2012, 07:49 PM   #2
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Quote:
Originally Posted by milosus View Post
is it be good working point of ecc88 like cathode follower on 60 volt on anode and 13 ma cathode current
That operating point has only about 1/2 Volt negative bias, which is really very small, especially for such a high gm valve. The potential issue is that the grid looks somewhat conductive to the driving source, and conductance will non-linearly vary with signal.

If driven from a low impedance and/or for small signals this might be just fine. Try it and see - can't hurt anything.

All good fortune,
Chris
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Old 30th August 2012, 08:07 PM   #3
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Milosus, do you mean that you have 60 V supply voltage available?
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Old 30th August 2012, 09:12 PM   #4
milosus is offline milosus  Serbia
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Yes i have 60 volt supply and i need maximum current that is possible becouse i want to drive headphones,Thank you
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Old 30th August 2012, 09:54 PM   #5
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Why do you want to drive headphones with an ECC88? There are tubes more suitable for that task...

Andreas
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Old 31st August 2012, 12:18 AM   #6
milosus is offline milosus  Serbia
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Ok,i listen..which tube will be suitable,but i have some proposition ..it must be noval type.And without a current ofr heating above 0,3 A.If you have any idea,which tube will be the better.

Thank you
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Old 31st August 2012, 10:40 AM   #7
palmas is offline palmas  Portugal
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Originally Posted by milosus View Post
Ok,i listen..which tube will be suitable,but i have some proposition ..it must be noval type.And without a current ofr heating above 0,3 A.If you have any idea,which tube will be the better.

Thank you
That's a tough one!
for low voltage and low filament current maybe ECC86 (even so I believe it has more than 0,3A).
Power will be on the short side for headphones, but there are way around that.
For higher power tubes, filament power grows fast...
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Old 31st August 2012, 10:42 AM   #8
SY is offline SY  United States
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It might help to define the load (headphone impedance) and required voltage swing into that load before you start trying to choose tubes or even the amp topology.
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Old 31st August 2012, 10:58 AM   #9
palmas is offline palmas  Portugal
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It might help to define the load (headphone impedance) and required voltage swing into that load before you start trying to choose tubes or even the amp topology.
I thought he was taking the "I have the PSU and some more parts and I want to use it to make whatever I can to drive some headphones".
If you're doing it right (starting by defining the exact goal) he will skip using what he has...
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Old 31st August 2012, 11:12 AM   #10
SY is offline SY  United States
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Nonetheless, if he wants to drive 32 ohm phones to 3VRMS, he'll have to do things quite a bit differently (or give up the idea) than if he wants to drive 2k headphones to 200mVRMS.
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