01-12-2013, 07:58 PM
No Maitiu - you don't need a battery - the set is designed to work off 105-120V DC or AC 50/60 Hz, or from 90V & 9V batteries, so you're fine in that regard with 110V.
You'll see from the circuit that when used on batteries, it uses a 90V HT battery, and a 9V battery for the heaters. Hence as the heaters ('filaments') are all 1.4V, and the LT battery is 9V, they must be in series, (like Christmas tree lights, and trade union strikers - one out - all out!), which means that if any one or more are open circuit, none of the valves will light up - not that you'll see much glow from them except in a darkened room. As a first step, I'd suggest that you pull out the valves and check the heaters for open circuits. (They're all pin 1 & 7).
You will incidentally need an antenna - just a few feet of wire will do temporarily, to get any signals.
Hope that helps a bit.
Best of luck with it - it looks an interesting set!
You'll see from the circuit that when used on batteries, it uses a 90V HT battery, and a 9V battery for the heaters. Hence as the heaters ('filaments') are all 1.4V, and the LT battery is 9V, they must be in series, (like Christmas tree lights, and trade union strikers - one out - all out!), which means that if any one or more are open circuit, none of the valves will light up - not that you'll see much glow from them except in a darkened room. As a first step, I'd suggest that you pull out the valves and check the heaters for open circuits. (They're all pin 1 & 7).
You will incidentally need an antenna - just a few feet of wire will do temporarily, to get any signals.
Hope that helps a bit.
Best of luck with it - it looks an interesting set!
Regards, David.
BVWS Member.
G-QRP Club Member 1339.
'I'm in my own little world, but I'm happy, and they know me here'
BVWS Member.
G-QRP Club Member 1339.
'I'm in my own little world, but I'm happy, and they know me here'
