6N7 PP amplifier

eta_beta_60 · 23rd April 2008, 07:06 PM

Hallo,
I am interested in building a PP amplifier class B with 6N7.
The signal inversion made by interstage transformer.
Driver stage with 6N7 with the two section in parallel.
Did someone realize a similar ampli?

Best regards

EC8010 · 23rd April 2008, 08:01 PM

Quote:

Originally posted by eta_beta_60
I am interested in building a PP amplifier

Please remember that just as English isn't your first language, it isn't the first language of many other posters, so it's very important to make your thread title as clear as possible - "ampli" might be an acceptable Italian abbreviation but it won't necessarily be recognised by everyone else.

As to your question, isn't there a diagram on the 6N7 data sheet?

Bandersnatch · 24th April 2008, 12:19 AM

hey-Hey!!!,
I've seen that schematic in the RCA book, but I can't hwlp wanting a better driver...and then the grid-current B operation of the finals gets consideration...an' I start wondering 'Why?'

But don't let that stop you, the 1635/6N7 is an inexpensive valve, and I like low-cost...

cheers,
Douglas

m6tt · 24th April 2008, 04:38 AM

Is there a reason this valve cannot be used in class A or AB? I'm not an EE, just a hobbyist, and so I guess I don't really understand what suits a triode to a particular class of operation (with pentodes I understand it has to do with the loadline v. plate dissipation, i.e., the knee might lie outside of where the class A loadline would go). I saw one of these valves for $3 and grabbed it at a local shop–however I've never seen a circuit use on in class A or AB as a P-P amp, and I was surprised considering the 10w total dissipation for the tube…(the class A data in the datasheet is for both sections in parallel as a driver)

Colt45 · 24th April 2008, 08:35 AM

6N7 pulls almost no plate current, with negative Vg1. no current... no power.

eta_beta_60 · 24th April 2008, 06:00 PM

I posted this 3D because the tube is very cheap but the intersatge transfomer not!!!!
So before to spend lot of money I hope to have some feed from someone that already build it.
Regards

Bandersnatch · 24th April 2008, 06:42 PM

hey-Hey!!!,
Consider also the RK34. It has similar circuit requirements, but its lower plate Z makes some parts of the design easier.
cheers,
Douglas

Bandersnatch · 24th April 2008, 06:45 PM

hey-Hey!!!,
Consider also the RK34. It has similar circuit requirements, but its lower plate Z makes some parts of the design easier.
cheers,
Douglas

23rd April 2008, 07:06 PM	#1
eta_beta_60 diyAudio Member Join Date: Dec 2007	6N7 PP ampli Hallo, I am interested in building a PP amplifier class B with 6N7. The signal inversion made by interstage transformer. Driver stage with 6N7 with the two section in parallel. Did someone realize a similar ampli? Best regards

24th April 2008, 12:19 AM	#3
Bandersnatch diyAudio Member Join Date: Jul 2003 Location: Ann Arbor, MI	hey-Hey!!!, I've seen that schematic in the RCA book, but I can't hwlp wanting a better driver...and then the grid-current B operation of the finals gets consideration...an' I start wondering 'Why?' But don't let that stop you, the 1635/6N7 is an inexpensive valve, and I like low-cost... cheers, Douglas __________________ the Tnuctipun will return

24th April 2008, 06:42 PM	#7
Bandersnatch diyAudio Member Join Date: Jul 2003 Location: Ann Arbor, MI	hey-Hey!!!, Consider also the RK34. It has similar circuit requirements, but its lower plate Z makes some parts of the design easier. cheers, Douglas __________________ the Tnuctipun will return

24th April 2008, 06:45 PM	#8
Bandersnatch diyAudio Member Join Date: Jul 2003 Location: Ann Arbor, MI	hey-Hey!!!, Consider also the RK34. It has similar circuit requirements, but its lower plate Z makes some parts of the design easier. cheers, Douglas __________________ the Tnuctipun will return

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24th April 2008, 04:38 AM	#4
m6tt diyAudio Member Join Date: Aug 2007	Is there a reason this valve cannot be used in class A or AB? I'm not an EE, just a hobbyist, and so I guess I don't really understand what suits a triode to a particular class of operation (with pentodes I understand it has to do with the loadline v. plate dissipation, i.e., the knee might lie outside of where the class A loadline would go). I saw one of these valves for $3 and grabbed it at a local shop–however I've never seen a circuit use on in class A or AB as a P-P amp, and I was surprised considering the 10w total dissipation for the tube…(the class A data in the datasheet is for both sections in parallel as a driver)

24th April 2008, 08:35 AM	#5
Colt45 diyAudio Member Join Date: Feb 2002 Location: Canada	6N7 pulls almost no plate current, with negative Vg1. no current... no power.

24th April 2008, 06:00 PM	#6
eta_beta_60 diyAudio Member Join Date: Dec 2007	I posted this 3D because the tube is very cheap but the intersatge transfomer not!!!! So before to spend lot of money I hope to have some feed from someone that already build it. Regards

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