Old russian tube radio

[planet10]

Originally posted by fdegrove
I checked it and it seems they don't have a Mac/Unix version yet.

I can always run it under VPC, but it was pretty easy to find the OS X version:

DjVu Browser Plug-in
available platforms: Win 32|Mac OS X|Mac OS 9|UNIX
Released: 03.12.2003
Enables Web browsers to display DjVu images.

Seems to work fine.

Thanx for the link... now i just have to brush up on my russian -- 6N14N?

dave

[fdegrove]

Thanx for the link... now i just have to brush up on my russian -- 6N14N?

6P14P...looks like the penthode used in the ECL82...???

Nazdrovje, (nevermind the spelling).

[Colt45]

Nope, 6P14P is pretty much identical to EL84/6BQ5

It has slightly higher plate dissipation ratings, 12w vs. 14w, but is identical otherwise.

The other tubes:

6K4P = EF93/6BA6
6H2P = 6AL5 ---- (looks like 6X2)
6I1P = ECH81/6AJ8
6N2P = 12AX7 --- (looks like 6H2)

[Colt45]

Oh, I forgot one tube.

6E1P = EM80/6BR5 (magic eye)

[fdegrove]

Hi,

Limiting values:

Type 6P14P 6P14P-V 6P14P-EV
Filament voltage, V 5,7-7 5,7-7 5,7-7
Anode voltage, V 300-400 300-500 300-500
2nd grid voltage, V 300 300-500 300-500
Cathode - heater voltage, V 100 200 200
Cathode current, mA 65 65 65
Anode dissipation, W 14 14 14
2nd grid dissipation, W 2.2 2 2
Resistance in 1st grid circuit, MOhm 1 1 1

General characteristics:

Type 6P14P 6P14P-V 6P14P-EV
Filament (heater) current, mA 760±60 760±60 760±60
Anode current, mA 48±8 48±8 48±8
2nd grid current, mA 5 5 5
Reverse 1st grid current, mkA £ 1 £ 1 £ 1
Dissipate cathode-heater current, mkA £ 25 £ 25 £ 25
Mutual conductance, mA/V 11.3 11.5 11.5
Output power (by RA=5.2Kohm), W 4.2 4.3 4.3
Non-linear distortion, % 8 8 8
Internal resistance, Kohm - - -
Equivalent noise resistance, Ohm 300
Inter electrode capacitance, pF:
input 11 11±2.5 11±2.5
output 7 8±2 8±2
transfer £ 0.2 0.75-0.4 0.75-0.4
Operation time, h 3000 1000 5000


Output power (by RA=5.2Kohm), W 4.2 4.3 4.3

That's where I stopped at first.

Cheers,

[Colt45]

I've attatched picture showing cyrillic character and closest english counterpart

you can tell soviet tubes by letter.

first letter:

S - triode
C - diode
K - pentode
Z - pentode
P - power pentode
F - triode/pentode, except 6F6S (=US 6F6G)
I - pentode/triode, i think
N - dual triode
D - diode

thats all i remember right now.. i dont think i forgot any!

number ending in 'P' means 9 or 7 pin mini. ending in S means other base.

[janar74]

Hey, now i have got the schematic, but do anyone of you know what kind of details i have to change to tune it to fm band. Some persons said that i should change the capacitors in ull block to smaller ones. But is there anykind of program or some person who can now what to do

[bournville]

You are more likely to be able to get the frequency up from the 65-74 mhz band to the 88-108 mhz band by reducing the windings on the ull coils in the aerial and oscillator circuits, or replacing the coils altogether.

One issue which may cause a problem is your frequency changer. I've had a quick look at the schematic and it uses a standard ECH81 type valve for both the AM and FM circuits, and it may perform adequately in this role. However, on most western sets for the 88-108 mhz band a double triode is commonly used as an RF amp and frequency changer, the standard triode heptode type frequency changer not being considered very efficient at these frequencies. You may find that your set has insufficient gain at these frequencies or, depending on the characteristics of the Russian tube fitted, not being able to get the oscillator to function at all.