And a bunch of 6N2P-EV tubes with a couple adapter variants. But for a slightly punchier bass and a little more air in the treble, any of the GE triple micas are awesome and are much cheaper than the WEs. I have also tried out the Bendix If you need a little more detail and brightness in your life, these are pretty impressive.
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To my knowledge this tube has been produced only in Soviet Union the oldest sample I found was from , the newest from It is a genuine Soviet design, unlike most of their tubes which they copied from the West all the time. The closest equivalent is the Ecc, ECC although the pinout is different,. We do not want to use the impulse variant 6N6P-i later named 6N30P. We want the good old 6N6P only.
Having said that the 6H6P can produce over 8 Watts of output power from both halves together and swing as much as V.
It is possible in SRPP config upside down. But the main differenciator is current: It can take such big current, that would fry other tubes dead. So it is excellent as a driver for power tubes like , B or 6C33C. Like almost all novals, this tube is a dual triode meaning phisically two triodes packed side by side in one glass bottle.
To reduce cross-talk i. Screen in tubes 6N6P There are two sub-groups of noval tubes: with screen and without. The first group to which belongs most of the western novals, like ECC82, 81, 83, etc. It has no screen dividing the A and B halves of the tube.
The screen is usually grounded. If they are separate - this is "6H6P camp". To modify the i. ECC82 circuit to work with 6H6P - first cut the traces or wires joining pins 4 and 5, and cut the trace or wire leading to pin 9. Move the heating current from 9 to 5, keepingt the 4 as it was. So current will flow from pin 4 to 5 instead of from 4,5 to 9. Our tube is a supertube and is double in lenght and has triple the electron emission surface. Hence it needs MORE power to heat the emmission area on the cathode.
It needs twice the current and namely - nominal current is mA 6,3 V dc or ac does not matter. So what do we do about the heater current during upgrade? There are many possible scenarios. Generally, most designs have big safety margins of specs. You can just hope that the device amp, preamp will tollerate mA more. It usually will. Regulator is a three legged chip usually standing upright and with sink of some sort - own heatsing radiator or screwed to the chassis.
Use larger sink if possible. The transformer is unlikely to burn the heater secondary, but it may start to buzz and overheat slightly. In such case it is time to install a separate transformer. If there are two tubes in the circuit - it is very easy. We change the heater supply from 2 paralell 6,3 V to a series 12,6 V. We run it like this: one wire to tube 1 leg 4, then a small jumper from tube 1 leg 5 to tube 2 leg 4, and from tube 2 leg 5 to the transformer second wire.
We adjust the voltage by a 3 watt resistors- ranging from 0,5 to 2 ohms. In most gear there is a room to add such transformer. It can be fed directly from AC socket without the main AC switch so the tubes will stay always warm and live longer.
Plus the product will sound well immediately after switching it on, without the warm-up period. A better option is to rectify the cirtcuit - meaning converting it to DC type. Usually this is not a problem and one can accept it and enjoy it with medium gain. For and 6DJ8 the improvement is so big it is beyond discussion.
The main difference is that the sound becomes so easy, it FLOWS, it is liquid, open, spacious, rock solid, and very very natural. At the same time, in the first day or so, some people call the new sound "lazy". I do not agree but they get used to the nature of 6H6P and after - wild horses cant drag people away from the new sound.
He raves that 6H30 is a supertube, but in my opinion it is very coarse, hard and glassy by comparison. You will be surprised.
I guess the real exotica can get close or really better the 6H6P in asymptotic way and then it becomes a personal taste issue. What I can guarantee - is that "my" love tube will easily outperform each and every new noval tube there is. The price of 6H6P in Poland ebay. I guess it lasts up to 10 years.
Recent upgrade of a Copland preamp changed this nice machine from a hi-fi to high end. And so on and so on. Next on my agenda is a conversion of Shanling CD Player from to 6H6P and then from tube triode cathode follower buffer to a true lampizator status.
Recognizing Original 6N30 ΔΡ - 6H30 DR Tubes
=2C51, 5670, 6CC42
Tubes For This Machine!
2C51 - 5670 - 396A - 6N3P