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EL84 Change to 6P14P-EV

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eldarvanyar

eldarvanyar

Member
Joined 2008
#1
I am collecting parts for an BH EL84 PP build and would like to use 6P14P-EB in place of the EL84 for the output tubes. I know they are not a strait swap

On RU Tubes.com
6P14P-EV = EL84 = 7189 = 6BQ5 tube. Output pentode ― Hi-End vacuum tubes, sockets, capacitors, nixie. Retail and wholesale to worldwide.

it states that

'The 6P14P-EV (6П14П-ЕВ) output pentode is designed for amplification of low-frequency power.

The 6P14P-EV output pentodes are miniature devices enclosed in glass bulb and are provided with a nine-pin base and an indirectly heated oxide-coated cathode.

The 6P14P-EV electorn tube output pentodes are resistant to ambient temperature from -60 to +70°C and relative humidity of 95 to 98% at +40°C, as well as to mechanical loads: vibration loads up to 2.5g and multiple impact loads up to 35g.

These are premium quality Russian 6P14P-EV tubes. -EV (ЕВ) suffix suggests they are rated twice as long service live (7,000 hours). Tube have gold grid.

All tubes new, military equipment and have "OTK" mark. Near equivalent: 7189, 6BQ5 and EL84M. The tube is manufactured by the Reflector plant, Saratov, Russia.

General characteristics:
Name: 6P14P-EV (aka 6P14P-EB)
Type: Output pentode
Application: LF power amplification
Cathode type: oxide, indirect heating
Envelope: glass, miniature
Mass, g: 20
Filament voltage, V: 6.3
Filament current, A: 0.7-0.82
Anode voltage, V: 256
Anode current, A: 0.04-0.056
Anode power, W: 14
Grid2 voltage, V: 256
Steepness, mA/V: 9.5-14.5
Reverse grid current, uA: 0,3
Microphnic noise, mV: 250
Gain: ~20
Socket type: rsh8

Can any of the experts explain how to wire them and anything else that I need to do including resistor value for fixed bias.

I know that the 6N2P's filament will take only 6.3V pins 4 and 5.

Thanks

Lee
 
#2
6P14P = EL84. Use a 6P14P anywhere you'd use an EL84. Not wiring or component changes required in my experience.

6P14P-EV might be rated at more plate dissipation like the 7189. Unless you are going to run them super hard the -EV isn't worth the extra cost IMHO.

Steve
 
#4
Francois G said:
Why do you think they are not a strait swap? You could safely use the Russian 6P14P-EV in the Baby Huey circuit in stead of the EL84 output tubes.
Click to expand...


Francois G said:
Why do you think they are not a strait swap? You could safely use the Russian 6P14P-EV in the Baby Huey circuit in stead of the EL84 output tubes.
Click to expand...


Hi Francois,

I am aware that the 6N2P is different wiring to the 12ax7 so that may be where I am getting confused or thinking that the wiring is different for The 6P14P.

Thanks

Lee
 
#5
You need to get the datasheet first, inside you'll find pin out and base type which is 9 pin socket (Noval, B9A) you'll need for PCB or point to point. Then you can wire it up or make PCB to join the other component to make output stage for SE amp for example. If the schematic is original el84, you'll need to compare the pin out of the tube, as well as other adjustments, e.g may be the screen voltage and screen resistor? But mostly will work without modifications.
 
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#6
The 7189 is an "industrial", tougher, version of the 6BQ5/EL84. The 6Π14Π is a mediocre EL84 equivalent and the 6Π14Π-EB is a quite decent 7189 equivalent that remains in production as the EL84M. A 7189 can go anywhere an EL84 goes, but the other way around is asking for trouble.
 
#8
Types 6BQ5, 6pi14pi and 7189 have unspecified internal connections to pins 1 and 6, and type 7189A specifies these pins as duplicates of G1 and G2 respectively. If the original manufacturer used either of these duplicate pins instead of the compatible pins 2 and 9 respectively, you'll want to change the wiring to the compatible pins. Otherwise, they're probably the best currently available.


YOS,
Chris
 
#9
It's funny that the people of North America do not appreciate some Russian tubes.😉

Well, I have used the Russian versions for years and compared them with all old and new manufactures what I think is as usual subjective. The 6P14P-EV tubes are among the better in terms of quality, the durability is far superior, I have never had a tube that has broken purely electrically and they fit straight in where an EL 84 is located.

They can be warmer than regular EL 84 I also usually make sure that 6P14P-EV gets its own beefier winding for the filament as they like a little more current if it is to be optimal, but otherwise they work great as they are
Their sound signature is in my opinion somewhere between TFK and Seimens according to my friends, you get a very balanced character.

My next SE will be with LL1663 opt I have a feeling that there is much more quality to listen to.
 
#10
Chris Hornbeck said:
Types 6BQ5, 6pi14pi and 7189 have unspecified internal connections to pins 1 and 6, and type 7189A specifies these pins as duplicates of G1 and G2 respectively. If the original manufacturer used either of these duplicate pins instead of the compatible pins 2 and 9 respectively, you'll want to change the wiring to the compatible pins. Otherwise, they're probably the best currently available.


YOS,
Chris
Click to expand...

Thanks for your information ,I got a 7189A P.P. cathode output schematic and the supply plate and g2 volt. almost 390 ,7189A is rare to found and very expansive, perhaps the only ways is replace with 6p14pev ( datasheet is almost the same of 7189A ) I was bit a 3 quad of 6p14pev on ebay
 
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