• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Old russian tube radio

Status
This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.
Hello! My name is Janar, i come from estonia, and i have a little problem. I have a radio, russian Ural112, and i would like to tune it from ull to fm band. Im not very experienced, so if any one can help me i would be very grateful.
I hope that you understand me and help me.
Janar
 
Janar,

Just to confirm - is 'ull' the short wave or 'ultra' short wave band? If so, you will not be able to adapt the set for FM operation, without significant circuit changes - you'd need fundamental changes to the frequency changer, RF amp, IF amp stages and the addition of a ratio detector at the very least! It would work out cheaper to acquire a FM tuner and play it through the 'gram' or 'pickup' sockets on the radio.

If the set you own is a 'classic,' a rare set which could become collectable, changes to it could damage the value. You might get more information from a discussion forum which specialises in old radios, such as:

http://www.vintage-radio.com/cgi-bin/yabb/YaBB.pl#general
 
diyAudio Senior Member
Joined 2002
DEJA VU...

Hi,

Any idea what kind of program is required to open a *.djvu file?

Delving into datasheets?

It's an extremely unobtrusive browser plug-in , I have it installed...no idea whether it runs on Mac platforms though.

System Requirements:

Pentium processor or above with MS Windows 98,ME, NT Service Pack 6, 2000, XP
64 MB RAM, 40 MB free disk space
256-color or higher display adaptor
Internet Explorer 4.0.2 or later

If it does work for you, I could always try to convert the sheets you like into *.PDF format.

Cheers,;)
 
diyAudio Senior Member
Joined 2002
Hi,

Dave it won't help you but here goes:

LIZARDTECH INC.

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

Assuming you use a wideband connection, I should be able to send you largish files, so just let me know what you need.
E-mail me me or whatever you see fit.

I'll transfer it to your inbox.

Cheers,;)

P.S. Guess you found this type of file on a Russian site?
 
frugal-phile™
Joined 2001
Paid Member
fdegrove said:
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
 

Attachments

  • ural-extract.gif
    ural-extract.gif
    17.6 KB · Views: 302
diyAudio Senior Member
Joined 2002
CRICKEY...

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,
;)
 
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.
 

Attachments

  • name.gif
    name.gif
    2 KB · Views: 200
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:confused:
 
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.
 
Status
This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.