6NiP test settings for Eico 667

[audiobliss]

Hi guys,
Anyone know the settings to test a 6nip/6h1n on a Eico 667 tester ?
I searched the sheets I have but found nothing.
Its supposed similar to 6dj8/6922, but I don't know if thier settings will work.

Any ideas ?

 

[TriodeLuvr]

The 6N1P is not the same as any other tube I know of, and despite what unscrupulous sellers say, certainly not the 6DJ8. My suggestion is to test a dozen samples or so and write down the settings and median numbers. Maybe start with settings for a 6GU7, which has the same filament wiring and nearly identical basing. The only difference is that the 6N1P has an internal shield connected to pin 9, which is unused in the 6GU7. Gm of the 6N1P is much closer to the 6GU7 than the 6DJ8, so the 6GU7 is a good start for deriving test settings.

Jack

 

[Tom Bavis]

6BK7 / 6BQ7 are probably closest - similar mu and transconductance. Tektronix used the 6BQ7 in many 'scopes, later changed to 6DJ8 without circuit changes, even recommended using 6DJ8 as a replacement for 6BQ7. But it's not necessarily a good replacement in every circuit.

 

[TriodeLuvr]

I agree, settings for the 6BQ7 might provide a better "starting point." Gm for the 6N1P is shown in data sheets as 3500 - 5500. Gm of the 6BQ7 is higher at 6400, but its amplification factor is about the same. Neither equals the super high gm of the 6DJ8 at 12,250.

Jack

 

[audiobliss]

I just tried two fairly new Chinese and two new Russian 6nip, using the 6gu7 settings. They all test as shown,
So maybe that's what their good looks like. I will try using the 6bq7 settings later to see what it says.

 

[arts]

I usually use the 6BK7/6BQ7 settings for testing the 6N1P.
I don't find the readings to be perfectly accurate, as they usually read on the low side, even for new tubes, but they're close enough for government work.

The 6GU7 and the 12BH7 are pretty darned close, and I have used them in a pinch back when 12BH7's got silly expensive for a few years.

Edit: The 6N1P is one of the longest lasting tubes that I have ever encountered. I still have the originals that came with my Audio Research VS110, and when compared to brand new tubes, the readings are almost identical. And this amp has a LOT of miles on it..

 

[Lavane]

I usually use the 6BK7/6BQ7 settings for testing the 6N1P.
I don't find the readings to be perfectly accurate, as they usually read on the low side, even for new tubes, but they're close enough for government work.

The 6GU7 and the 12BH7 are pretty darned close, and I have used them in a pinch back when 12BH7's got silly expensive for a few years.

Edit: The 6N1P is one of the longest lasting tubes that I have ever encountered. I still have the originals that came with my Audio Research VS110, and when compared to brand new tubes, the readings are almost identical. And this amp has a LOT of miles on it..

Testing Russian and Chinese tubes has been a crap shoot. I've tested various so called subs for western tubes and you get a reading, so I guess they're conducting, and you can see if there's a short.
The 6P14P-P's tested kind of close to some 7189's though.

 

[audiobliss]

Using the 6BQ7 settings on the Eico the 6NIPs all test good. Not the highest of scores, but good enough.
Thanks for the help.