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Old 3rd March 2004, 08:34 AM   #1
trancy is offline trancy  Slovenia
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Default cathode follower with gain

can someone show me, how to build mu CF with ECC88, power supply +/- 50 V or 100V, with gain 3, input res on my amp is 4,7Kohm (3,5V ,700uA)...

thanks
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Old 3rd March 2004, 09:18 AM   #2
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Hi trancy

A CF alone has no gain ( gain <1).
It has to be preceded (or followed) by a gain stage.

Federico
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Old 3rd March 2004, 09:26 AM   #3
trancy is offline trancy  Slovenia
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Quote:
Originally posted by fscarpa58
Hi trancy

A CF alone has no gain ( gain <1).
It has to be preceded (or followed) by a gain stage.

Federico
yeah ....like that...

I was trying to make a schematic in micro-cap, but probably Im too stupid.....
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Old 3rd March 2004, 09:33 AM   #4
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Hi trancy

Last year I was in Bled for my white week holidays
Beautiful place.

I'll send you a pic for a 6dj8 common cathode
followed by a CF.
But since a gain of 3 is very low I have to
attenuate the input or the output.

Federico
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Old 4th March 2004, 01:41 AM   #5
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A mu stage has a CCS-loaded triode (although it should work with pentodes just as well) with CF output. Think about it!

Tim
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Old 4th March 2004, 02:36 AM   #6
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Trancy,

Attached is a cathode follower followed by a common cathode stage. I was told that tubes such as 6DJ8, 6922, ECC88, 6N1P can be used for such a configuration.

Federico,

Would it be possible for you to provide values for the resistors using 6N1P and ECC88 tubes? I have a couple of 6N1P sitting here waiting to be used.

Thanks!

JojoD
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File Type: jpg common_cathode-cathode_follower.jpg (16.3 KB, 716 views)
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Old 4th March 2004, 05:37 AM   #7
trancy is offline trancy  Slovenia
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Quote:
Originally posted by fscarpa58
Hi trancy

Last year I was in Bled for my white week holidays
Beautiful place.

I'll send you a pic for a 6dj8 common cathode
followed by a CF.
But since a gain of 3 is very low I have to
attenuate the input or the output.

Federico
wau...I live near by Bled, next time we should meet...


Iam waiting for your sch. .....thanks a lot...
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Old 4th March 2004, 11:53 AM   #8
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Hi trancy

Sorry for the delay, but yesterday
I had not success in connecting
to the forum.
here is the pic

ciao

Federico
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File Type: jpg cf.jpg (10.4 KB, 640 views)
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Old 4th March 2004, 11:59 AM   #9
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JojoD

what is the input resistance of the amplifier?
( I am supposing that this is a preamplifer
which will drive an amplifier)

ciao
Federico
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Old 4th March 2004, 12:36 PM   #10
trancy is offline trancy  Slovenia
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thanks a lot federico, I will report how it works soon...I hope without smoking signals....
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