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Old 23rd April 2008, 07:06 PM   #1
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Default 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
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Old 23rd April 2008, 08:01 PM   #2
EC8010 is offline EC8010  United Kingdom
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Default Re: 6N7 PP amplifier

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?
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Old 24th April 2008, 12:19 AM   #3
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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
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Old 24th April 2008, 04:38 AM   #4
m6tt is offline m6tt  United States
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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)
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Old 24th April 2008, 08:35 AM   #5
Colt45 is offline Colt45  Serbia
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6N7 pulls almost no plate current, with negative Vg1. no current... no power.
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Old 24th April 2008, 06:00 PM   #6
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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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Old 24th April 2008, 06:42 PM   #7
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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
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Old 24th April 2008, 06:45 PM   #8
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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
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