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-   -   cathode follower with gain (http://www.diyaudio.com/forums/tubes-valves/29431-cathode-follower-gain.html)

trancy 3rd March 2004 09:34 AM

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

fscarpa58 3rd March 2004 10:18 AM

Hi trancy

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

Federico

trancy 3rd March 2004 10:26 AM

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.....

fscarpa58 3rd March 2004 10:33 AM

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

Sch3mat1c 4th March 2004 02:41 AM

A mu stage has a CCS-loaded triode (although it should work with pentodes just as well) with CF output. Think about it!

Tim

JojoD818 4th March 2004 03:36 AM

2 Attachment(s)
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. :D

Thanks!

JojoD

trancy 4th March 2004 06:37 AM

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...

fscarpa58 4th March 2004 12:53 PM

2 Attachment(s)
Hi trancy

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

ciao

Federico

fscarpa58 4th March 2004 12:59 PM

JojoD

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

ciao
Federico

trancy 4th March 2004 01:36 PM

thanks a lot federico, I will report how it works soon...I hope without smoking signals....


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