6DJ8 vs 6N1P (6H1N) - diyAudio
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Old 27th September 2009, 04:42 AM   #1
TheGimp is online now TheGimp  United States
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Default 6DJ8 vs 6N1P (6H1N)

I bought 10 of the 6N1P (6H1π) tubes that are advertised as equivalent to the 6DJ8.

In testing them I'm getting a Gm of around 800 for the 6H1π compared to 12,500 for 6DJ8s pulled from a 545 oscilloscope.

Has anyone had any experience with the 6H1π tubes? How do they work on low noise input amp circuits (which is what I plan on using them in)?

Thanks.

Steven
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Old 27th September 2009, 04:48 AM   #2
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800? Should be closer to 8000.

6N1P ~= 6922 (with less Gm anyway) in plate voltage ratings. Often it is subbed for a 6DJ8 in many apps and can work well there.

But if the goal is say a phono input stage or mic stage, a 6DJ8 will outperform, if run at high Ia to take advantage of the high Gm (which most designs don't).

6N1P is a gorgeous, clean, clear sounding tube. I like it

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Old 27th September 2009, 05:12 AM   #3
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Do note that the 6H1pi needs 2x the heater current as 6DJ8

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Old 27th September 2009, 06:13 AM   #4
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Try 6N23P, it is closer to 6DJ8 than 6N1P

When production of 6N1P started it was positioned as a replacement to 6SN7 for future developments of equipment.
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Old 27th September 2009, 03:16 PM   #5
TheGimp is online now TheGimp  United States
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Gm was 4000, not 800. Read wrong scale.

4000 would be high for 6SN7, but 6SN7 is tested differently on this test set, and when the 6N1P is tested that way it comes out near 3400Gm, which is reasonable.

So these are more an equivalent of the 6SN7.

I may watch for some 6N23Ps, thanks.

First photo is 6N1P, second photo is 6DJ8. Both have filament voltage adjusted near 6.3V.
Attached Images
File Type: jpg Small_6N1P-EV.JPG (129.5 KB, 1196 views)
File Type: jpg Small_6DJ8.JPG (136.3 KB, 1137 views)

Last edited by TheGimp; 27th September 2009 at 03:18 PM. Reason: add notes on photos
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Old 27th September 2009, 03:18 PM   #6
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I can't seem to find a good 6N1P. What makes are good, and where could I find it? It seems the Voshkhod and military grade stuff on ebay sound bad.
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Old 27th September 2009, 05:41 PM   #7
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Quote:
Originally Posted by 88man View Post
I can't seem to find a good 6N1P. What makes are good, and where could I find it? It seems the Voshkhod and military grade stuff on ebay sound bad.
Shuguang makes them too. Most people I know hate them. But, most like the Voshkhod.

Trade with some members?

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Old 27th September 2009, 06:24 PM   #8
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Quote:
Originally Posted by 88man View Post
I can't seem to find a good 6N1P. What makes are good, and where could I find it? It seems the Voshkhod and military grade stuff on ebay sound bad.

Well i have 6N2P's from Voskhod... and its true they sound very bad.

Ive got some 6N1P's with a red discription from ebay and they sound good to me
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Old 28th September 2009, 06:59 PM   #9
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6N1P & 6N2P it's have some difference. But before buying you need check if this NOS (New Old Stock) or Used tubes. If cann't find in description look at the photos. Factory made it's important to, here you can view NOS 6N1P-EV tubes.

"EV" symbols mean, that tube have high mechanical strength and reliability, increased durability

Quote:
Originally Posted by Tube-Head View Post
Well i have 6N2P's from Voskhod... and its true they sound very bad.

Ive got some 6N1P's with a red discription from ebay and they sound good to me
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Old 1st October 2009, 05:37 AM   #10
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All the Russian tubes I've ordered have been advertised as NOS.

The 6N1P are all marked 6H1n-BN, 92@07, OTK with a 9 inside a diamond.
The 6N2P are all marked 6H2n-EB, OTK1, 11-84, with 16 inside a diamond.
The 6P1P are all marked 6n1n-EB with an emblem which is a circle with three bars on each side and a "C" in the middle (Wing-C Svetlana?), VI-77, and 55 inside a diamond.

All these came from the same vendor over a period of several months.

I'm waiting on 6N23Ps from another vendor.

It will be interesting to see how they compare to the 6DJ8s I have.
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