Stock) Russian 6P14P-EV as translated from Cyrillic. It is a military build that meets or exceeds the USA made specifications. Preferred Series tubes. Name, 6P14P. Type, Output pentode. Application, LF power amplification. Cathode type, oxide,indirect heating. Envelope, glass,miniature. Mass,g, Filament. 6P14P (6П14П) Pinout. No information available. 6P14P (6П14П) Substitutes. No information available. 6P14P (6П14П) Ratings. No information available.
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6P14P-EV = EL84 = 7189 = 6BQ5 tube. Output pentode
So if parameters of a lot are the same, the higher expectations you can have to the base quality of that lot. This tube used to be very expensive when it was made! The table below is an extract from it. Then you end up with tubes that have lower parameters for everyting. If you know about tubes, you will immediately recognize 6p4p is very special.
NOS stocks of this tube have been released for public sales only recently, and stocks are low. EL84 Only differences are listed here when identical, it is not listed. A similar situation we have for the Philips EL84, also a fantastic tube, but expensive. What is the best EL84 to buy?
So whatever the situation, I prefer such lots that have not been picked from. Hum will start at kOhm or lower. WIth the tubes comes a four page original printed data sheet, listing in full detail the excellent specifications of this tube, in Russian.
Or better said, not use lower cost materials, of which the low cost EL84 is made of. The tighter tolerance for plate current can be achieved with simply better adjustment of the tubes, before putting them in the glass bulb.
This picking makes little sense, but it does get a problem when stocks have been picked from multiple times.
Generally it can be said, just this is the weakness of Chinese tubes. Now, for the 6P14P-EB This lot may have lower lifetime, and fatasheet rate is highter. These low cost materials produce contaminating residues when the tube gets older. Matching in pairs or quads in included in the price.
This adds to the input signal and will be amplified by the tube. This is really special. Perhaps not many of the readers had the chance to compare lots pcs original packed NOS tubes with each other, or compare such lots with pcs of new made tubes. It was originally designed for the military to have long-life audio tube with low-microphonics, and not having to use the lower quality EL84 radio tube for this. In that was datasheeg Telefunken. So I take from tubes randomly 6 tubes.
The lower microphonics are reached dstasheet using double layer mica, which gives better stability to the system. Like a datzsheet of getters was in contact with air too long, etc. They do not throw away tubes that are on the edge of the specs, but also not throw away over-stocked or not so well stored production materials.
TDSL Tube data [6P14P (6П14П)]
This dataasheet injects a 50Hz ripple signal from the filament to the cathode. They throw nothing away. Also vice versa, this applies.
So I make a distribution, and then I see immediately of some values are missing.
What is the best EL84 to buy? 6P14P-EB!
The 6P14P-EB deals with all of these problems at the same time. Only differences are listed here when identical, it is not listed. Main thing, the tubes work, and if it goes wrong we replace them, they say. Others pick out the higher DC current values as if those are better, and if somebody has a Hickok tester, he’ll pick out those with higher transconductance as that’s all he can see.
Actually it makes little sense, but some people pick out the center values, as if those are better. The longer lifetime can be achieved by using more expensive materials. Also you can see if somebody picked out specific values, it’s not necesarily a bad lot, but you can never say why he wanted to have those that he picked out, and why he did not want to have those that he sold. In terms of quality, there is one very important observation I made many times before.
With standard EL84, plate current ranges from an estimated 30mA to 90mA.
6p1p4 After hours they begin to wear out, and they are worth not much any more. It was never before available for commercial use. Even so, Chinese factories make it a sport, continuously tweak the processes for using cheaper materials, and leave steps and control away.
This will lead unavoidably to a wider spread in tube parameters. So when you find 6 random tubes to be very strong, BUT they are all totally different, this is good, but not ideal.
If tubes of a lot appear all identical, datasheeet promises best quality. A good alternative is the EI EL84, which sometimes can be found. The standard EL84 has actually not a very high lifetime, it can be microphonic, and is produced with an almost unacceptable wide range of plate current.