Oktava MK13m tube

[Papa Tango Charly]

Hello I'm looking for the Schematic of the Oktava MK13m 6S6B valve output transformer 10/1.

 

[mjrippe]

Very odd, the only schematics I have are for the transistor version of this mic. However, the only one I have seen in person was also valve based!

 

[emrr]

I believe i have some of both types to go through when I can get to it, will try and document.

 

[Papa Tango Charly]

Hello EMRR that would be Fantastic. Could you put the pin voltage if you can. Thank you so much. I you want the Lomo 19a19 schematic, I can put it on line for you. Thank tou

 

[Papa Tango Charly]

Hello I have found this fet version of the Oktava MK13. I would like to find the tube version of this OKtava MK13. Thank you

 

[Drosselmeier]

Most likely the tube version of MK-13M was homemade. Perhaps on the basis of the MK-12, MK-15 scheme.

UPD: MK-13- tube, based 6S51N nuvistor, M7 type capsule. MK-13M- FET, M7 type capsule: Для тех, кому нужны студийные микрофоны

 

[Papa Tango Charly]

Great Thank you! Do you Have the Transformer Ratio of the transformer?

 

[Drosselmeier]

The same as in Lomo 19a19 I think

 

[alphasnk]

Great Thank you! Do you Have the Transformer Ratio of the transformer?

I think that anything from 6:1 to 15:1 should be ok

 

[Papa Tango Charly]

MK13 BOM

Could confirm the following values:

R1: 500M

52: 500M

R3: 1.8K

R4: 39K

C1: 3,3UF?

C2: 30nF ?

C3:Value?

C4:Value?



Could you translate me the pinout please

Could you tel me the reference of the tube

Thank you in advance best

 

[alphasnk]

To me it seems to be
C1 = 3.3nf
C2 = 30uf
C3 = As you wish it sets the high pass filter on the output, 1uf should be good, check the voltage!
C4 = i dont know!

 

[Drosselmeier]

С1 = 3300 (pF)
C3 - type KM-4a max 150nF
R3 - 1,1K - 1,3K
R4 - 0,75K - 2,2K
FET schematic... or other?

 

[LevinGuitar]

C1 3300pf
C2 30uf
C3 1uf
C4 is the capsule

 

[Papa Tango Charly]

I was thinking about the same thing C4 is the M7 capsule

From what i see in this video this is 6S31 tube (see the picture attach)
Any more information would be great!
If anybody could you translate me the pinout
I would really like to have the complete picture.
Thank for. your help
It's lot's of guessing, i'm in need confirmations please. Anyone on the forum?

This is the LOMO 19A18 Pinout
1 = signal
2 = Signal
3 = Ground
4 = Filament 6V dcx150ma
5 = Plate +120V dcx 1ma
6 & 7 Free

MK13 BOM

Could confirm the following values:

R1: 500M

R2: 500M

R3: 1.8K

R4: 39K

C1: = 3.3nf

C2: 30uf

C3: 1uF

C4: M7 capsule

Tube 6S31

 

[LevinGuitar]

The traces in the schematic above goes to their respective mic pinout, even if you can't read is easy to see what goes where.

Microphone pinout:

1 Heater (—)
2 Ground
3 B+ (anode)
4 Capsule polarization voltage
5 Signal
6 Signal
7 Heater (+)


Tube pinout:
http://www.russiantubes.ru/prop.php?t=12&p=320

 

[Papa Tango Charly]

Thank you for every thing. Anybody could tell me what is the voltage of the anode B+?
Thank you

Microphone pinout:

1 Heater (—)
2 Ground
3 B+ (anode)
4 Capsule polarization voltage
5 Signal
6 Signal
7 Heater (+) 6.3V

 

[alphasnk]

From what you can read in the datasheet for this tube, you can use something like 50v for B+, you could try 48v / phantom power

 

[Khron]

From what you can read in the datasheet for this tube, you can use something like 50v for B+, you could try 48v / phantom power

You'll still need a 6.3v 2-300mA supply for the heater though.

 

[Papa Tango Charly]

Does anybody have other though for the MK13 BOM
What would be the best tension for an M7
I would like to use a 3U audio M7 from Guosheng.
Thanks best

 

[alphasnk]

Use what you want. This is more a learn to cook rather than a follow the recipe thing.