As the title says I want to know your views on this: I have a receiver which requires 220 volts DC HT for the valve anodes and 12.6 volts DC for the heaters from a seperate PSU at the moment I have it run via a variac fed from an isolation TX the unfortunate thing is its audio output is a bit on the low side so I want to run it through an audio amplifier the thing is the amp has the mains neutral straight to chassis and one side of AF input also to the chassis so if I link the 2 beasts together my receiver RF Earth will also be taking the amps chassis to earth I could run it all from the isolation TX do you think that's the best option?
Valve heaters were typically 6.3V. Sometimes series/parralled up for other voltages. Sometimes with vintage radios for domestic use they were supplied with a two core flex with the neutral connected to the chasis inside a wooden or plastic box, hopefully getting the flex terminated in the supply plug the correct way around. As Mike says plastic control knobs on the spindles poking out of the case. The valve heaters all wired in series with a wire wound dropper resistor to get the 6.3V across each valve.
I am thinking you have to much load on your valve heater supply for it's rating?
Mike
The HRO war time receiver was a very good receiver considering it was a WW2 vintage. My school radio club ( junior anoraks this way please) had one with a range of the coil packs. I had a AR88 of the same vintage also built like a brick outhouse needing a fork lift to move. I saw one yesterday watching a documentary on the Dambusters also a T1154/R1155 inside the Lancaster. The senior management was not best pleased when I was pointing out all the different bits of kit ,I think I saw a T1509 in the background in one scene.
Valve heaters were typically 6.3V. Sometimes series/parralled up for other voltages. Sometimes with vintage radios for domestic use they were supplied with a two core flex with the neutral connected to the chasis inside a wooden or plastic box, hopefully getting the flex terminated in the supply plug the correct way around. As Mike says plastic control knobs on the spindles poking out of the case. The valve heaters all wired in series with a wire wound dropper resistor to get the 6.3V across each valve.
I am thinking you have to much load on your valve heater supply for it's rating?
Mike
The HRO war time receiver was a very good receiver considering it was a WW2 vintage. My school radio club ( junior anoraks this way please) had one with a range of the coil packs. I had a AR88 of the same vintage also built like a brick outhouse needing a fork lift to move. I saw one yesterday watching a documentary on the Dambusters also a T1154/R1155 inside the Lancaster. The senior management was not best pleased when I was pointing out all the different bits of kit ,I think I saw a T1509 in the background in one scene.
