Hi everyone,
the 4P10C is a forgotten Russian octal pentode with plate cup (not MO) that has a 15W dissipation with specs close to EL34 (though it looks like a KT66 having a similar size box plate but smaller plate wings).
I don't see anything in the net about it.
I do have it's detailed specs as can be found on a paper packed by the factory inside the tube box.
Any member that has tested it in a project?
the 4P10C is a forgotten Russian octal pentode with plate cup (not MO) that has a 15W dissipation with specs close to EL34 (though it looks like a KT66 having a similar size box plate but smaller plate wings).
I don't see anything in the net about it.
I do have it's detailed specs as can be found on a paper packed by the factory inside the tube box.
Any member that has tested it in a project?
Data sheet
Hi, attached you will find the data sheet. If you look at the bottom of the page I have the comparative test results performed on my AVO tester at Va=300V, Vg=230V and in all cases at a bias voltage that gave a plate current of 50mA.
The tubes compared were the following:
5881 S=5mA/V,
KT66 S=6.5ma/V and a
Philips EL34 S=9.5mA/V.
The 4P10C at the above conditions gave an S=8mA/V.
Hi, attached you will find the data sheet. If you look at the bottom of the page I have the comparative test results performed on my AVO tester at Va=300V, Vg=230V and in all cases at a bias voltage that gave a plate current of 50mA.
The tubes compared were the following:
5881 S=5mA/V,
KT66 S=6.5ma/V and a
Philips EL34 S=9.5mA/V.
The 4P10C at the above conditions gave an S=8mA/V.
Attachments
I bought some today, going to try them.
They look similar to this one:
http://www.r-type.org/pdfs/pen46.pdf
They look similar to this one:
http://www.r-type.org/pdfs/pen46.pdf
Here are pictures, to compare with 6P3S
...hmmm... I could not attach the pictures:
"Your submission could not be processed because a security token was missing.
If this occurred unexpectedly, please inform the administrator and describe the action you performed before you received this error."
...hmmm... I could not attach the pictures:
"Your submission could not be processed because a security token was missing.
If this occurred unexpectedly, please inform the administrator and describe the action you performed before you received this error."
Interesting looking tube for a small pentode connected SE or PP amp.
Wonder what the linearity is like, given it's original application it should not be too bad if the proper load line is chosen.
Wonder what the linearity is like, given it's original application it should not be too bad if the proper load line is chosen.
It looks like KT66, but the screen grid is much closer to cathode.
I am going to try them in P-P.
6K load, 320V on anode, 220V on G2
With 8 mA/V it can be easily driven by a Concertina. 6F12P would deal with them easy.
I am going to try them in P-P.
6K load, 320V on anode, 220V on G2
With 8 mA/V it can be easily driven by a Concertina. 6F12P would deal with them easy.
i also get the same message, so what i do is upload pics one at a time....
can you link me to a good seller of these tubes?
Hi, I just saw (after 3 years) these 4P10C tubes still sitting on a shelf here and I wonder if you tried them?
Apparently this 4P10C tube was a copy of the British VT-127D and Mazda PEN46, which have the old British "octal" base. (does not fit current octal base)
Где применялась 4П10С - ВТОРАЯ ЖИЗНЬ СТАРОГО РАДИО
https://frank.pocnet.net/sheets/146/p/PEN46.pdf
https://frank.pocnet.net/images/Maz/p/PEN46_Mazda_HM.jpg
Pen46 @ The Valve Museum
VT127 @ The Valve Museum
Где применялась 4П10С - ВТОРАЯ ЖИЗНЬ СТАРОГО РАДИО
https://frank.pocnet.net/sheets/146/p/PEN46.pdf
https://frank.pocnet.net/images/Maz/p/PEN46_Mazda_HM.jpg
Pen46 @ The Valve Museum
VT127 @ The Valve Museum
Attachments
Yes, the PEN46 is on the Mazda Octal (MO) base. Good pentode, but AEI's refusal to adopt the International standard octal looks like an attempted monopolistic manœuvre that went bad.
4P10C tubes
Excellent, so in my next amp the finals will be 4P10C. As I have to build a power amp with 6146's ppp (4pcs/ch) the 4P10C's may temporarily sit in one channel. G2's are powered through tertiary windings, Acrosound style. The Mazda octal sockets thanks to PRC are already here!
Excellent, so in my next amp the finals will be 4P10C. As I have to build a power amp with 6146's ppp (4pcs/ch) the 4P10C's may temporarily sit in one channel. G2's are powered through tertiary windings, Acrosound style. The Mazda octal sockets thanks to PRC are already here!
The pen46 looks very similar to the Mazda 6P28.
Only 6,3V and IO base. Equally rare it seems.
One of the many on the to-do list.
Only 6,3V and IO base. Equally rare it seems.
One of the many on the to-do list.
I made one amp using Raytheon VT127/CV1127 made for RAF. The sound and working conditions are like 4П10С, but the tube internally is different. Instead of flat cathode, grids and anode, it uses internals similar to 807, oval-shaped.
What is funny, tubes were never de-classified, so it is impossible to find printed data except test conditions. They were used in radar monitors, were quite linear for better pictures, unlike later sweep tubes that worked in pulse mode.
Matthew Willims - I contacted Anatoliy regarding an amp... | Facebook
What is funny, tubes were never de-classified, so it is impossible to find printed data except test conditions. They were used in radar monitors, were quite linear for better pictures, unlike later sweep tubes that worked in pulse mode.
Matthew Willims - I contacted Anatoliy regarding an amp... | Facebook
The only minus of Raytheon VT-127 tubes is, their Mazda bases are pretty fragile! I damaged 2 of them while pulling out of sockets, like I always do, slightly shaking around. Probably, because thin plastic is 70 years old...
Maybe one could remove the old tube base with a vacuum de-solderer and replace that with a modern octal base.
2pcs 8pin Ceramic Octal Pin Plug Base For 6SN7 6L6 6CA7 EL34 Tube Test Adapter | eBay
Or use individual wire lead pin sockets, assuming they are 3 mm diameter:
Gold Plated Brass Pin Feet For Tube Socket KT88 EL34 6550 GZ34 274B Nixie VFDx10 | eBay
and/or maybe use:
4pc Octal Gold plated CMC tube Socket adapter bare PCB 2.0mm thicker | eBay
2pcs 8pin Ceramic Octal Pin Plug Base For 6SN7 6L6 6CA7 EL34 Tube Test Adapter | eBay
Or use individual wire lead pin sockets, assuming they are 3 mm diameter:
Gold Plated Brass Pin Feet For Tube Socket KT88 EL34 6550 GZ34 274B Nixie VFDx10 | eBay
and/or maybe use:
4pc Octal Gold plated CMC tube Socket adapter bare PCB 2.0mm thicker | eBay