6N6P vs 5687

[morfeas]

Below are the spectum analysis on the output 6AS7G PSET, driver 5687 vs 6H6. Pout 6.2watts. At lower pout 6H6 wins on total thd.

 

[Bas Horneman]

They always sound better to me than metal chassis

So I've been told as well...never did establish that for myself though...

 

[Bas Horneman]

Hi Bas,
You did a very nice job here. I just bought 6 of 6N6P for $10 at eBay and I’ll make a same kind of this Amp when I get all my parts ready. I might use all 6N6P for driver and output too.

Thanks! Good luck on the build..and please show and tell when youre done

 

[Bas Horneman]

Here is a little movie (7mb) of the little amp that could. (I call it the jdpp short for James Doddington PushPull)

http://basaudio.net/data/jdpp.wmv

smaller file without title and credits (4mb)
http://basaudio.net/data/jdpp_small.wmv

 

[Bas Horneman]

Youtube.com link so you can see it as it starts and kill it if you don't find it interesting. (And so you don't have to download the whole thing first)

http://www.youtube.com/watch?v=A2ks5GjxcrE

And that way you can see the amps of some other Geeks
AX84 diy guitar amp
http://www.youtube.com/watch?v=R15m6EpGwRc

Marshall factory tour pt1
http://www.youtube.com/watch?v=MMn54QSvmX0

 

[denny9167]

I am using a 6N6P in a schematic designed for a 6H30,and first impressions are WOW!!! very little if any microphonics,it blows away any 12AU7 I've used,a wonderful tube,really cheap as well.

 

[jimmyd53]

Denny,

Can you please post the 6h30 schematic that you are using. Thanks. James

 

[denny9167]

Denny,

Can you please post the 6h30 schematic that you are using. Thanks. James

Sure it can be found here,a super topology!!





http://digilander.libero.it/paeng/a_6h30s_line_preamp.htm

 

[kstagger]

I recently rewired my 5687 simple linestage filament supply to use the 6N6P - I've always been a firm believer in the superiority of USA/Euro tubes - and the 6N6P has certainly changed my mind on that account.

Best bang for the buck tube out there.

 

[Tyimo]

Hi!

What is the ideal load for a 6N6P tube? Ri x 2?-3?-4?-5?

Greets:

Tyimo

 

[Koifarm]

Tyimo, below a application to calculate the ideal load.

http://www.ict-net.net/tube.xls

 

[Tyimo]

Thanks!

I am just interested how people choose the plate load for the 6N6P tube.

Tyimo

 

[Brit01]

single 6N6P for stereo pre-amp

Hi guys,

I'm going to have a shot at a very simple cathode follower pre-amp but using both sides of double triode like the 6N6P for the left and right channels.

I have attached a photo (don't have any software to design these yet; if anyone knows of a good freeware please advise).

How does this look?

 

[Tyimo]

Hi!

In push pull a single 6N6P or 6H30 will give about 1.5 to2W in Class A. If you examine their structure you can see that these two are the same except for grid spacing yielding lower mu and Rp for the 6H30.

Move it to Class AB and you can double that.

How can I change the circuit to ClassAB??? Could somebody help me?

Greets:
Tyimo

 

[artosalo]

6N6P with 8k...10k OPT, 5 W at class AB1.

An externally hosted image should be here but it was not working when we last tested it.

 

[Tyimo]

Thanks!!!
R1-R2 are 1 Ohm??

 

[artosalo]

Yes, 1 to 10 ohms. These are to measure quiescent current separately from both triodes.
The drawing above is just the basic schematic. A bias balance adjustment is required for actual circuit, etc.
I understood your question so that you just wanted to know how the make class AB1 6N6P output circuit, not full working amplifier.
Am I right ?

 

[Tyimo]

Hi!
Yes, but what would you suggest for bias balance adjustment ?
I would like to try Garter bias.
greets:
Tyimo

 

[artosalo]

Below is an example of bias balance arrangement with fixed bias (potentiometer P2 together with R13 and R14).

An externally hosted image should be here but it was not working when we last tested it.

Garter circuit is possible with autobias only (as far as I know...).

 

[twystd]

6n6P linestage

I built a 6N6P parafeed line stage, and I'm very happy with it. The 6N6P is very linear. Here's a link to a post I made in the Magnequest forum.

Bwahahaha....! It's FRANKENLINE II ! - twystd - MagneQuest/Peerless Forum

It's a simple parafeed triode gain stage, with battery bias, K&K audio CCSs as loads, Magnequest 15K B7 transformers, Russian KBG parafeed caps, bypassed by Russian SSG silver and micas, DAC attenuators.

Power supply: small balanced power transformer, feeding R core power transformer, TV damper diode rectification, critical inductance choke input, LCLC PDM filter section, using Russian MBGO smoothing caps.

Like most tubes, not all 6N6Ps are created equal. IMO some of the best are early 70's vintage Reflector/Saratovs, same vintage Novosibirsks are very nice as well, the Novosibirsk with the red dab of paint at the tip of the tube are select grade, I buy them when I can find them. By far the best are the 1964 Reflectors with the square getter, and the old diamond shaped logo. They may be available in other years around that time, but I have only seen the 1964s.

The 6N6P is cheap, readily available, very linear, robust, and IMO sound great....obviously I'm a big fan of this tube.

twystd