The AM Forum
December 12, 2024, 06:41:29 AM *
Welcome, Guest. Please login or register.

Login with username, password and session length
 
   Home   Help Calendar Links Staff List Gallery Login Register  
Pages: [1]   Go Down
  Print  
Author Topic: What is this tube?  (Read 3653 times)
0 Members and 1 Guest are viewing this topic.
VK7ZL
Guest
« on: November 02, 2012, 04:33:25 AM »

This tube was given to me yesterday.
The bottom of the small cylinder is marked Telefunken. The small cylinder slides inside the larger one and the brass studs on the bottom make contact with brass strips inside the larger cylinder with the terminations on the outside. There are six contacts around the bottom. The stud on the top of the small cylinder slides into a ceramic disc at the top of the large cylinder which also has a contact attached to it.
The numbers on the small cylinder are BAL 716 & RV2  P800  45 40. At the top is 30/40 & 400548. There are no numbers on the large cylinder.

I am sure someone will recognise it.

Bob  VK7ZL


* 100_1752.jpg (194.32 KB, 776x1564 - viewed 408 times.)

* 100_1753.jpg (388.58 KB, 1421x1551 - viewed 457 times.)
Logged
N4zed
Member

Offline Offline

Posts: 150



« Reply #1 on: November 02, 2012, 08:31:01 AM »

http://www.nonstopsystems.com/radio/hellschreiber-tubes.htm

??
Logged

Ken<br />N4zed
kb3ouk
Member

Offline Offline

Posts: 1640

The Voice of Fulton County


« Reply #2 on: November 02, 2012, 10:01:53 AM »

Telefunken made a tube known as the LS-50 that also had that handle on top. After WWII, the Soviets made a clone of it called the GU-50. The Soviets loved to copy tubes from everyone else, maybe change them slightly, then give them a new name. GU-48 is a 833A clone. GU-13 is a 813 clone, while the GK-71 is a true pentode version of the GU-13 (internally it's a 803, but physically looks like a 813).
Logged

Clarke's Second Law: The only way of discovering the limits of the possible is by venturing a little past them into the impossible
W7TFO
WTF-OVER in 7 land Dennis
Contributing
Member
*
Offline Offline

Posts: 2497


IN A TRIODE NO ONE CAN HEAR YOUR SCREEN


WWW
« Reply #3 on: November 02, 2012, 02:30:56 PM »

It is interesting to see the parallel development of tube technology in the attached article.

Also the invention of the pentode and Bakelite by Germans...

73DG
Logged

Just pacing the Farady cage...
G3UUR
Member

Offline Offline

Posts: 141


« Reply #4 on: November 02, 2012, 02:50:10 PM »

Hello Bob,

The important part of the lettering on the tube is RV2 P800. This is a 2-volt filament general purpose tube made for the Wermacht and used in many of their bits of radio kit. You should find more info on some of the German websites or possibly some of the British ones dedicated to military radio.

Hope that helps!

73,

Dave.
Logged

Dave,G3UUR
Vintage AM from the East of England
VK7ZL
Guest
« Reply #5 on: November 03, 2012, 06:39:05 PM »

Thanks to all for the information. The Germans were certainly innovative.

Bob  VK7ZL


Logged
Pages: [1]   Go Up
  Print  
 
Jump to:  

AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
 AMfone © 2001-2015
Powered by SMF 1.1.21 | SMF © 2015, Simple Machines
Page created in 0.033 seconds with 19 queries.