Advance UHF Millivoltmeter VM 79

[pwdrive]

From what I have read the Mallory TR233R was a zinc mercury battery, it in itself containing three RM3R 1.4 volt cells, there's a readable page on the different types on Google books.

http://books.google.co.uk/books?id=QmVR7qiB5AUC&pg=SA55-PA10&dq=mallory+rm3r&hl=en&sa=X&ei=e-BLU_rbI6bH7Aa3woHIAQ&ved=0CDEQ6AEwAA#v=onepage&q=mallory%20rm3r&f=false

Lawrence.