rnros
1000+ Head-Fier
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- Sep 12, 2004
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Hells bells. OK, who's gonna make the list of tubes that work with this pin converter + the Lyr?
http://www.ebay.com/itm/2pc-Gold-plated-5670-6n3-WE396A-TO-ECC88-6922-6DJ8-tube-adapter-for-you-amp-/191636111735?_trksid=p2141725.m3641.l6368
Here's the limited information I can provide:
Baldr's (Mike M) statement on this group/family of tubes:
"The 6N3P/5670/2C51/396A tube has the curves/same specs as a 6DJ8/6922/6N23P but a totally different pinout. Therefore, the need for the adapter. Once the adapters are bought, new options are opened for Vali2/Valhalla/Lyr rollers. Because the 6N3P/5670/2C51/396A tubes are rare in audio design, they are cheap on the open market. Further there is no Western Electric option in the 6DJ8/6922/6N23P tube pinout family. The best built tube of all of these are the Western Electric 396A, period. It is just their relative unavailability and high cost make them unsuitable for production quantities."
(http://www.head-fi.org/t/619910/schiit-valhalla-tube-rolling-thread/480#post_12466041)
Mike is clear on his pick of the WE 396A as the best of the bunch. (I have NOT tried this tube yet.) The 2C51, 5670, 396A all share the same short tube format. The first two go back to the fifties at least since the 5670 is included in GE's 5 Star design line-up in the early fifties. The 396A apparently was Western Electric's improvement on the 5760.
The 6N3P is the Russian version. It keeps the same size tube format as the 6N23P. It is available in at least five formats, 6N3P, 6N3P-EV, 6N3P-I, 6N3P-E and 6N3P-DR. The 6N3 is the Chinese version of the Russian.
I had already been interested in the Reflector 6N3P-E because it shares similar internal design/construction to the '60's 6N1P-E and 6N5P (which I like), but rather than the higher heater current of ~600mA (OK for Lyr1/Valhalla/Vali2) the 6N3P-E has a heater current in the ~300mA range similar to the 6DJ8/6N23P family. So we have the older triple mica, black box anode design in a version compatible with the lower heater current Schiit amps.
So far, I like this tube. I have four pairs in rotation-burn, '77, '79, '81, and '83. Only the '77 has more than 30 hrs. The others less than twenty. You can see my description of the sound profile in another recent post. It seems to have closed a bit (smaller soundstage) at the moment and shows a little less agility, but that's not unusual in my experience with NOS. We'll see where it goes. However I don't think this is a tube that NEEDS 100 to 200hrs. Ugh, hate that! Sounds great right out of the gate. Also, I can't tell any difference yet between the years listed. They all have identical construction as far as the naked eye (with magnification) can see. Only the Reflector etch logo changes.
Again, I am only referring to the REFL 6N3P-E. I have not tried the 6N3P or the 6N3P-EV, these are a different internal design (2 micas), and the 6N3P-I is the pulse version (may have the 3 micas).
I do also have the REFL 6N3P-DR, this version adds some additional internal stiffness by also anchoring the anode posts in the top mica plate. The getter assembly is also larger and sturdier. On limited initial listening, I cannot hear any difference from the 6N3P-E. BTW, the 'Triple-Mica' description refers to three layers/stages of mica plates, there are actually four mica plates, with two stacked together at the bottom.
And the last tube: the 6N26P will also work with this adapter but this a ~600mA heater current so can only be used in the Lyr1, Valhalla2, or the Vali2. And the current may actually be a little bit higher than that, so experiment only at your own risk, this is not a recommendation for this tube in those amps. But it's close and I can't resist...