Aragar So I take from tubes randomly 6 tubes. Hum darasheet start at kOhm or lower. Then you end up with tubes that have lower parameters for everyting. The 6P14P-EB deals with all of these problems at the same time. 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.
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EL84 Only differences are listed here when identical, it is not listed. So I take from tubes randomly 6 tubes. The longer lifetime can be achieved by using more expensive materials. Matching in pairs or quads in included in the price. This adds to the input signal and will be amplified by the tube.
So whatever the situation, I prefer such lots that have not dahasheet picked from. Also vice versa, this applies.
In that was sure Telefunken. The tighter tolerance for plate current can be achieved with simply better adjustment datzsheet the tubes, before putting them in the glass bulb. The 6P14P-EB deals with all of these problems at the same time. The table below is an extract from it.
After hours they begin to wear out, and they are worth not much any more. What is the best EL84 to buy? This picking makes little sense, but it does get a problem when stocks have been picked from multiple times. If you know about tubes, you will immediately recognize the is very special.
A similar situation we have for the Philips EL84, also a fantastic tube, but expensive. This is really special. This tube used to be very expensive when it was made! Then you end up with tubes that have lower parameters for 6p They throw nothing away.
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.
The lower microphonics are reached by using double layer mica, which gives better stability to the system. Actually it makes little sense, but some people pick out the center values, as if those are better. It was never before available for commercial use. Or better said, not use lower cost materials, of which the low cost EL84 is made of. 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. Now, for the 6P14P-EB 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.
A good alternative is the EI EL84, which sometimes can be found. Hum will start at kOhm or lower. If tubes of a lot appear all identical, this promises best quality. Main thing, the tubes work, and if it goes wrong we replace them, they say.
So when you find 6 random tubes to be datssheet strong, BUT they are all totally different, this is good, but not datasheft. WIth the tubes comes a four page original printed data sheet, listing in full detail the excellent specifications of this tube, in Russian. Output pentode This will lead unavoidably to a wider spread in tube parameters. This lot may have lower lifetime, and problem rate is highter. Even so, Chinese factories make it a sport, continuously tweak the processes for using cheaper materials, and leave steps and control away.
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. The standard EL84 has actually not a dataheet high lifetime, it can be microphonic, and is produced with an almost unacceptable wide range of plate current.
6P14P DATASHEET PDF