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radiogram

dathi mccabe · 2012-03-17 23:05:20

hello all i have a pilot radiogram circa 1950 it was working until recently i was able to recieve rte1 on lw and several stations on mw i now have none anyone able to offer some tips on how to fix this also can you tell me how to spot if a tube valve is damaged or worn out

17-03-2012 11:05pm

#1
dathi mccabe

Registered Users, Registered Users 2 Posts: 1 ✭

Join Date: March 2012

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hello all i have a pilot radiogram circa 1950 it was working until recently i was able to recieve rte1 on lw and several stations on mw i now have none anyone able to offer some tips on how to fix this also can you tell me how to spot if a tube valve is damaged or worn out

Tagged:

valve radio

radiogram

radio hobbies

0

Comments

#2 18-03-2012 2:09am

monomono

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What is the model number?,are the valves 12AH or 7S7s,is the dial light working?.

0
#3 21-03-2012 8:35am

watty

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More Vintage guys here:
http://vintagetvandradio.myfreeforum.org/index.php

It could be anything. Also if a capacitor coupling to the input grid of the output valve is faulty the output valve and transformer will be short lived.

The wax coated /impregnated paper capacitors in cardboard tubes fail.

If one valve doesn't light it may be faulty. But unless the heater fails (pin 4 &5 on 9pin and 2 & 7 on old Octal types), valve stuff fades gradually if a valve is wearing out.

0