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Old 4th November 2004, 08:20 PM   #1
hihopes is offline hihopes  South Africa
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Default 6n1p simpl(ish) design

Hi tube-nuts! I have spent endless hours looking for simple but good line-amp designs, preferably using 6N1P tubes. All I have to show for it so far is gigabytes of downloads and a massive telephone bill. (And a fair amount of confusion!)
Can anyone suggest something not too difficult? I am a newbie to tubes, but I know without any doubt this is the way I want to go. Gain can be anything from unity to about 5x. I am replacing my passive pre and I have just enough gain with it at the moment, but a bit more would also be okay.
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Old 4th November 2004, 08:52 PM   #2
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6N1P are beautiful in mu-follower or Loftin-White CF stages
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Old 5th November 2004, 01:33 AM   #3
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Hi,

Quote:
6N1P are beautiful in mu-follower or Loftin-White CF stages
Hmmmm...
Too much gain from the mu-follower probably and unity gain from the WCF.

Somewhere inbetween there's that nice SRPP circuit which will do nicely provided you build it a nice PS and don't use too long and too capacitive interconnects. Never too bright an idea anyway.

Make sure you look at the correct datasheet for the 6N1-P. There's quite a bit of rubbish being spread over the net about that one....

Cheers,
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Old 5th November 2004, 02:28 AM   #4
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Use a Lundahl LL1660 (or other OPT) anode loaded SE with a 4.5:1 ratio.
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Old 5th November 2004, 03:25 AM   #5
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6N1P in SRPP can have an output Z of ~100 ohms. Why would you want to muck it up with a transformer?
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Old 5th November 2004, 03:41 AM   #6
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Quote:
Originally posted by Geek
6N1P in SRPP can have an output Z of ~100 ohms. Why would you want to muck it up with a transformer?
Why would you want a crap SRPP? Awful sounding things.
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Old 5th November 2004, 05:30 AM   #7
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Quote:
Why would you want to muck it up with a transformer?
You have never really tried the transformer thing, right?
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Old 5th November 2004, 06:31 AM   #8
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hihopes,

Is there any particular reason why you want to use the 6N1P?

A simple grounded cathode circuit with a low-mu triode like the 12B4 is reputed to sound good. If you are willing to use transformer-coupling (which is of course more expensive because of the transformer), olden-day 1930s triodes like the 56, 76 etc are also reputed to be good-sounding.

I don't mean to confuse, but there are many other options out there...
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Old 5th November 2004, 07:34 AM   #9
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Quote:
Originally posted by audiousername
hihopes,

Is there any particular reason why you want to use the 6N1P?

A simple grounded cathode circuit with a low-mu triode like the 12B4 is reputed to sound good.
The 12B4A is a great option and will give the specified performance at modest cost, cheaper than the OPT option. I've posted my variation on that theme several times before on this board. Using such a high mu triode (6N1P) to try to get a stage with a 0-5x gain is not the best choice imo/ime.
Quote:
If you are willing to use transformer-coupling (which is of course more expensive because of the transformer), olden-day 1930s triodes like the 56, 76 etc are also reputed to be good-sounding.
There are also other more modern options such as the ECC99 that are less finicky than some of the vintage triodes.
Quote:
I don't mean to confuse, but there are many other options out there...
You raise good points, and there are of course a lot of other options. The 6N1P is a decent tube, but this is not where I'd use it.
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Old 5th November 2004, 09:56 AM   #10
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There is no such thing as a Loftin -White cathode follower. Eric White was a colleague of Alan Blumlein and he patented the push-pull cathode follower circuit which bears his name. Nothing at all to do with the Loftin-White direct coupled circuit.
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