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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Like a box of getters was in contact with air too long, etc. 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. Or better said, not use lower cost materials, of which the low cost EL84 is made of.
This is really special. Now, for the 6P14P-EB It was never before available for commercial use. If you know about tubes, you will immediately recognize the is very special. 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.
So when you find 6 random tubes to be very strong, BUT they are all totally different, this is good, but not ideal. Datawheet table below is an extract from it.
Matching in pairs or quads in included in the price. After hours they begin to wear out, and they are worth not much any more.
TDSL Tube data [6P14P (6П14П)]
So I take from tubes randomly 6 tubes. This “resistor” injects a 50Hz ripple signal from the filament to the cathode. 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.
Hum will start at kOhm or lower. This adds to the input signal and will be amplified by the tube. This picking makes little sense, but it does get a problem when stocks have been picked from multiple times. Datzsheet pick out the higher DC current values as if those are better, and if somebody dahasheet a Hickok tester, he’ll pick out those with higher transconductance as that’s all he can see. With standard EL84, plate current ranges from an estimated 30mA to 90mA.
So I make a distribution, and then I see immediately of some values are missing. This will lead unavoidably to a wider spread in tube parameters.
6P14P-EV = EL84 = 7189 = 6BQ5 tube. Output pentode
This lot may have lower lifetime, and problem rate is highter. If tubes of a lot appear all identical, this promises best quality. The tighter tolerance for plate current can be achieved with simply better adjustment of the tubes, 6l14p putting them in the glass bulb. What is the best EL84 to buy?
Generally it can be daasheet, just this is the weakness of Chinese tubes. Also vice versa, this applies. The longer lifetime can be achieved by using more expensive materials. NOS stocks of this tube have been released datawheet public sales only recently, and stocks are low.
Then you end up with tubes that have lower parameters for everyting. The lower microphonics are reached by using double layer mica, which gives better stability to the system.
Only differences are listed here when identical, it is not listed. 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. This tube used to be very expensive when it was made!
So whatever the situation, I prefer such lots that have not been picked from. A similar situation we 6pp14p for the Philips EL84, also a fantastic tube, but expensive. The standard EL84 has actually not a very datashete lifetime, it can be microphonic, and is produced with an almost unacceptable wide range of plate current.
These low cost materials produce contaminating residues when the tube gets older. So if parameters of a lot are the same, the higher expectations you can have to the base quality of that lot.
A good alternative is the EI EL84, which sometimes can be found. Main thing, the tubes work, and if it goes wrong we replace them, they say. WIth the tubes comes a four page original printed data sheet, listing in full detail the excellent specifications of this tube, in Russian. Actually it makes little sense, but some people pick out the center values, as if those are better. In terms of quality, there is one very important observation I made many times before.
EL84 Only differences are listed here when identical, it is not listed. Even so, Chinese factories make it a sport, continuously tweak the processes for using cheaper materials, and leave steps and control away.
The 6P14P-EB deals with all of these problems at the same time. In that was sure Telefunken.