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Old 5th July 2013, 09:17 PM   #1
aldovan is offline aldovan  Brazil
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Default 6N7...this configuration work ?

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I want use the two sections of a 6N7 as voltage amplifier in cascade.
This configuration is possible ? Work without problem?
double triode single catode.jpg

Thanks,

Aldovan
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Old 5th July 2013, 09:21 PM   #2
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No grid leak on either section. No it won't work as drawn.

Shoog
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Old 5th July 2013, 09:30 PM   #3
aldovan is offline aldovan  Brazil
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Default Sorry I forget...

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Originally Posted by Shoog View Post
No grid leak on either section. No it won't work as drawn.

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OK, AND NOW ?

double triode single catode.jpg
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Old 5th July 2013, 09:42 PM   #4
ilimzn is offline ilimzn  Croatia
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...And it is in danger of becoming a Schmitt trigger circuit. In this case the common cathode is actually positive feedback. Although the LED has a very low impedance compared to the cathodes, looking at it on a dB scale shows a problem - this amplifier will have a small hysteresis WRT input signal. I.e. it will be non-linear in a ost unwelcome fashion. If you are building a stereo amp, use one 6N7 as the first stage and another as the second stage, do not use one for both stages.
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Old 5th July 2013, 09:57 PM   #5
aldovan is offline aldovan  Brazil
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Default Ok, and now ?

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Originally Posted by ilimzn View Post
...And it is in danger of becoming a Schmitt trigger circuit. In this case the common cathode is actually positive feedback. Although the LED has a very low impedance compared to the cathodes, looking at it on a dB scale shows a problem - this amplifier will have a small hysteresis WRT input signal. I.e. it will be non-linear in a ost unwelcome fashion. If you are building a stereo amp, use one 6N7 as the first stage and another as the second stage, do not use one for both stages.
Ok, and now, work ?
double triode single catode.jpg
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Old 5th July 2013, 10:03 PM   #6
aldovan is offline aldovan  Brazil
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Default new variation

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Originally Posted by aldovan View Post
Ok, and now, work ?
Attachment 358343
And now ?

double triode single catode.jpg
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Old 5th July 2013, 10:12 PM   #7
Merlinb is offline Merlinb  United Kingdom
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Quote:
Originally Posted by aldovan View Post
OK, AND NOW ?

Attachment 358342
Yes that will work. You don't need to worry about Schmitt trigger action with only an LED in the cathode circuit; it's impedance is negligible.
Click the image to open in full size.
CCDA Noval Stereo PCB

Last edited by Merlinb; 5th July 2013 at 10:25 PM.
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Old 5th July 2013, 10:17 PM   #8
aldovan is offline aldovan  Brazil
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Originally Posted by Merlinb View Post
Yes that will work. You don't need to worry about Schmitt trigger action with only an LED in the cathode circuit; it's impedance is negligible.
CCDA Noval Stereo PCB
But I need the capacitor in parallel or not ?
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Old 5th July 2013, 10:21 PM   #9
Merlinb is offline Merlinb  United Kingdom
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Quote:
Originally Posted by aldovan View Post
But I need the capacitor in parallel or not ?
You don't *need* one, but you can try it if you like.

Also, I think you meant to use 47k anode resistors and not 4.7k.

Last edited by Merlinb; 5th July 2013 at 10:29 PM.
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Old 5th July 2013, 10:42 PM   #10
aldovan is offline aldovan  Brazil
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Quote:
Originally Posted by Merlinb View Post
You don't *need* one, but you can try it if you like.

Also, I think you meant to use 47k anode resistors and not 4.7k.
No, I want driver a power triode.
Now the circuit is ok ?
I will use 600V in the plates and the catode current is 40mA,
The tube is replaced by RK34.

double triode single catode.jpg
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