I want to find any octal base replacement for soviet 6S19P 9-pin regulator tube for tube voltage stabiliser.
6S19P parameters:
http://www.nj7p.org/Tubes/PDFs/Frank/113-Soviet/6S19P.pdf
f = 6.3V 1.0A
Ip = 95 mA cont, 140mA max
Vfk = 250V max
Va cold = 500V max
I want filament with 6.3V 1-1.2A, maybe 1.5A, not 2A as I saw for several types of octal triodes. Current 70 mA minimum.
Any octal analogs for this?
6S19P parameters:
http://www.nj7p.org/Tubes/PDFs/Frank/113-Soviet/6S19P.pdf
f = 6.3V 1.0A
Ip = 95 mA cont, 140mA max
Vfk = 250V max
Va cold = 500V max
I want filament with 6.3V 1-1.2A, maybe 1.5A, not 2A as I saw for several types of octal triodes. Current 70 mA minimum.
Any octal analogs for this?
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I would think that the Ia/Va characteristics of the 6L6 triode connected are rather different than those of the 6S19P. See: https://upload.wikimedia.org/wikipedia/commons/5/59/6L6_triode_anode_characteristics.jpg
At Va = 160 V and Ia = 70 mA, Vg1 for the 6S19P is about -50 V while Vg1 for the 6L6 triode connected is only about -5 V.
This ofcourse doesn't mean that the 6L6 is unsuitable for regulated power supplies but I don't think you could use the 6L6 in a circuit designed for the 6S19P.
At Va = 160 V and Ia = 70 mA, Vg1 for the 6S19P is about -50 V while Vg1 for the 6CK4 is about -12 V.
Closer than the 6L6 triode connected but I wonder if a 6CK4 would always function properly in a circuit designed for the 6S19P.
The closest single tube I could find until now is the EL360 triode connected, but at Va = 160 V and Ia = 70 mA, Vg1 still only is -23 V (see page C13): https://frank.pocnet.net/sheets/129/e/EL360.pdf
Closer than the 6L6 triode connected but I wonder if a 6CK4 would always function properly in a circuit designed for the 6S19P.
The closest single tube I could find until now is the EL360 triode connected, but at Va = 160 V and Ia = 70 mA, Vg1 still only is -23 V (see page C13): https://frank.pocnet.net/sheets/129/e/EL360.pdf
Im a designer so I can change my schematic.
6S19P Grid -5V/-22V
6L6 = 6P3S (rus) Grid +6V/+2V - not good
6CK4 Grid 0V/-5V
6S19P was designed special for voltage stabilisers, have low internal resistance, and beautiful vertical filament glow at both sides (but damn hot). So I need to think - use all octal tubes, or one not but with special design and glow.
In my circuit:
Vin 300/340
Vout 240
Vin 300/340
Vout 240
= plate 60V/100V
Current 60mA6S19P Grid -5V/-22V
6L6 = 6P3S (rus) Grid +6V/+2V - not good
6CK4 Grid 0V/-5V
6S19P was designed special for voltage stabilisers, have low internal resistance, and beautiful vertical filament glow at both sides (but damn hot). So I need to think - use all octal tubes, or one not but with special design and glow.
"Soviet sweep tubes 6P13S and 6P31S."
The 6P13S and 6P31S just look very similar, but are actually quite different tubes!
The 6P13S and 6P31S just look very similar, but are actually quite different tubes!
I bought a box of tubes containing a pair of EN32/2050 tubes, that look to have been designed for this role.
EN32/2050
There is a thread here on DiyAudio with some thoughts on how to use them ...
Regulated PS
I am open to offers for them - they are near Zurich.
EN32/2050
There is a thread here on DiyAudio with some thoughts on how to use them ...
Regulated PS
I am open to offers for them - they are near Zurich.
As tetrode with 250V on the screen the 6L6 or 6P3S can do over 100mA with 60V on the anode. So why not good ?
Mona
The 6CK4 suggested by jhstewart9 in post number 5 looks very close indeed, if the drive circuit was designed for only a small amount of grid current some headroom could be obtained. It looks like 60mA at 60V with zero volts on the grid.
Sorry it looks like the heater cathode voltage limit (200V) might kill this idea.
Sorry it looks like the heater cathode voltage limit (200V) might kill this idea.
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My very old lab PS
Unfortunately very few common tubes have an H-K rating so that the heater can be reliably connected to the same supply as the error amplifier. This Reg PS is very straight forward but with the addition of the ability to select choke or cap input filter. That allows more current at lower voltages. The voltage adjust range can also be switched.
The transformers are Hammonds from a time when Southern Ontario was still on a 25 Hz power grid. These PTs had been in a PP 815 audio amp I'd built.
The small 6.3V, 60 Hz transformer for the 6AU6 came later.
The 39R equalizing resistors are in the cathodes of the series losser tube, not in the anodes as we sometimes see in the Olde Toob Manuals. Resistors in the cathodes are (Mu + 1) times as effective as if they were in the anodes. On occasion I've used a 6BX7 as the losser, that way lower voltages are possible. The pinout is the same as the 6AS7G/6080.
Internal impedance & supply correction are proportional to the FB factor. That depends on the reference, in this case a 150V gas tube. By using a negative supply the FB factor is larger than if the gas tube was above common.
Gain of the error amp is also important. By selecting a screen supply that can be improved to a degree also.
I've built jumpers into an Octal plug so that the PS can be used unregulated by subbing that in for the losser tube. And Si diodes into another plug for use as the main rectifier. The entire PS is isolated from the chassis.
I've built many PS while in the lab as both separate & inside other equipment.
Both CC & CV. Many hybrids. They are all FB amplifiers. I escaped from the lab before ever getting into switchmode tho.😀
Unfortunately very few common tubes have an H-K rating so that the heater can be reliably connected to the same supply as the error amplifier. This Reg PS is very straight forward but with the addition of the ability to select choke or cap input filter. That allows more current at lower voltages. The voltage adjust range can also be switched.
The transformers are Hammonds from a time when Southern Ontario was still on a 25 Hz power grid. These PTs had been in a PP 815 audio amp I'd built.
The small 6.3V, 60 Hz transformer for the 6AU6 came later.
The 39R equalizing resistors are in the cathodes of the series losser tube, not in the anodes as we sometimes see in the Olde Toob Manuals. Resistors in the cathodes are (Mu + 1) times as effective as if they were in the anodes. On occasion I've used a 6BX7 as the losser, that way lower voltages are possible. The pinout is the same as the 6AS7G/6080.
Internal impedance & supply correction are proportional to the FB factor. That depends on the reference, in this case a 150V gas tube. By using a negative supply the FB factor is larger than if the gas tube was above common.
Gain of the error amp is also important. By selecting a screen supply that can be improved to a degree also.
I've built jumpers into an Octal plug so that the PS can be used unregulated by subbing that in for the losser tube. And Si diodes into another plug for use as the main rectifier. The entire PS is isolated from the chassis.
I've built many PS while in the lab as both separate & inside other equipment.
Both CC & CV. Many hybrids. They are all FB amplifiers. I escaped from the lab before ever getting into switchmode tho.😀
Attachments
Just forget the octal bit and wire one of these under the chassis to the octal pins that are active. CV4038, end of problem.
It's by far and away the smallest and best device of its kind ever made. 😉
Shown here a chain of russian gas reg tubes to drop down from 650V HT to 450V then use the 2 x 150V regs to get a steady 300V reference.
Then the miniature triode that follows it.
I squeezed this into the UBER-cluttered under chassis of a 1968 vintage Bogen MO200.
(One of the last ones made.)
It regulates screen supply properly for 2 x 100W amps on the same chassis from the main 650V supply rather than the 1/2 wave doubler, so screen current demands can be pretty vicious.
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