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Catode follower with 6N7S (6n7GT)
Catode follower with 6N7S (6n7GT)
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Old 20th April 2013, 09:20 PM   #11
Gost22 is offline Gost22  Bolivia
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let's close the topic,...
cheers!
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Old 21st April 2013, 05:55 AM   #12
Gost22 is offline Gost22  Bolivia
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Originally Posted by Gost22 View Post
let's close the topic,...
cheers!
Hi,
Yes, this is a revised schematics Broskie John's!
Now I need help for connecting power supply to the heater with anode voltage catode follower?
Please help me where to connect the points A and B of the heater with cathode follower? (see schematics power supply for heater)
Thank you for your cooperation!
Attached Images
File Type: png Catode follower with 6n8s (schematics-1).PNG (23.1 KB, 150 views)
Attached Files
File Type: pdf Power supply (heater).pdf (36.1 KB, 47 views)

Last edited by Gost22; 21st April 2013 at 06:11 AM.
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Old 22nd April 2013, 04:26 PM   #13
Gost22 is offline Gost22  Bolivia
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Come on, guys have to work on this case ... so little to go on, ...
I can not understand what the problem is?!
It seems the problem is because the English is not my native language!?
cheers!

Last edited by Gost22; 22nd April 2013 at 04:35 PM.
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Old 22nd April 2013, 05:34 PM   #14
ErikdeBest is offline ErikdeBest  Switzerland
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Catode follower with 6N7S (6n7GT)
I think you can ignore the regulated PS for the moment, as it should be possible to make a line stage with AC heating.

So, connect a 47k and 150k (2W) resistor in series. Put a 1000nF (electrolytic) of at least 150VDC across the 47k resistor, with the positive of the cap connected to the node between 150k and 47k. Connect the 150k loose end to B+, the 47k (and cap) to B-. Connect two 100R resistors in series across the 6,3V heater, the center of these resistors goes to the node of the 47k and 150k resistor.

Confusing description, but if you understand make a drawing and we can say if it is correct.
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Old 23rd April 2013, 08:35 AM   #15
Gost22 is offline Gost22  Bolivia
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Originally Posted by ErikdeBest View Post
I think you can ignore the regulated PS for the moment, as it should be possible to make a line stage with AC heating.

So, connect a 47k and 150k (2W) resistor in series. Put a 1000nF (electrolytic) of at least 150VDC across the 47k resistor, with the positive of the cap connected to the node between 150k and 47k. Connect the 150k loose end to B+, the 47k (and cap) to B-. Connect two 100R resistors in series across the 6,3V heater, the center of these resistors goes to the node of the 47k and 150k resistor.

Confusing description, but if you understand make a drawing and we can say if it is correct.
Hi ErikdeBest!
Could you please show all this on schematics.
thank you!

Last edited by Gost22; 23rd April 2013 at 08:47 AM.
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Old 23rd April 2013, 09:14 AM   #16
ErikdeBest is offline ErikdeBest  Switzerland
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Catode follower with 6N7S (6n7GT)
I can't draw schematics, therefore I wrote it down so you could do it. But I did some googling and found a drawing to illustrate above. It is from valvewizard, a must read. In the attached schematic R1 should be 150k, R2 is 47k, C1 is 10muF (instead of 1000nF I wrote before). The point marked HT+ goes to the positive rail, the point marked with earth goes to the negative rail (not to earth!!)
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File Type: jpg heater5.jpg (32.8 KB, 97 views)
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Old 23rd April 2013, 10:10 AM   #17
Gost22 is offline Gost22  Bolivia
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The full schematics in peint can now a connect .
thank you!
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File Type: png Complet schematics-1.png (185.4 KB, 88 views)

Last edited by Gost22; 23rd April 2013 at 10:26 AM.
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Old 23rd April 2013, 10:33 AM   #18
Gost22 is offline Gost22  Bolivia
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Originally Posted by Gost22 View Post
The full schematics in peint can now a connect .
thank you!
On picture is schema who is completed now you can make conection.
Is this okay? (see schematics-2)
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File Type: png Complet schematics-2.png (227.9 KB, 86 views)

Last edited by Gost22; 23rd April 2013 at 10:48 AM.
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Old 26th April 2013, 08:48 AM   #19
Gost22 is offline Gost22  Bolivia
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ErikdeBest, where comment?
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Old 26th April 2013, 09:10 AM   #20
ErikdeBest is offline ErikdeBest  Switzerland
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Catode follower with 6N7S (6n7GT)
Hi Gost22

Many years ago I could barely understand basic circuits and spent days to understand a small suggested modification/combination of circuits. I decided to start from the basics and built battery operated headamps, small gainclones, while reading through several books to get the understanding of circuits I have now (which is still not much, but enough not to kill myself or lose precious components).

The knowledge level you demonstrate in your posts shows you are at the same position I was years ago: besides not understanding circuit design also a lot of doubts about what sounds best, etc etc. Therefore I am not comfortable with explaining what is wrong with your circuit and to correct it: not that I don't want or can't, but I am really afraid that with your lack of knowledge you will hurt yourself with the HV present in this circuit.

My recommendation is that you do some further reading before embarking in building tube circuits. Meanwhile you may be better of building LV Solid State circuits - but take care with mains!
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