09-02-2016, 08:28 PM
Connecting up the Murphy to the tunable frame aerial has transformed the set. Lots of distant stations now coming in, now the problem is overloading on strong local stations. The A3A does not have a volume control, instead it relies on the reaction control to set the volume level. This is not a satisfactory arrangement. On strong signals even when the control is set to minimum reaction there is still too much volume.
There is a switched and adjustable aerial attenuator around the back of the set which helps. Another problem with the A3A is that the control of reaction is not smooth.
For comparison purposes I'll hook up the Philips 834 super inductance receiver. Both sets date from 1931. Philips went about the design of a TRF receiver in a different manner, two RF amplifier stages and an anode bend detector, no reaction control needed. Only two tuned circuits compared with the Murphy's three.
Geordie McBoyne.
There is a switched and adjustable aerial attenuator around the back of the set which helps. Another problem with the A3A is that the control of reaction is not smooth.
For comparison purposes I'll hook up the Philips 834 super inductance receiver. Both sets date from 1931. Philips went about the design of a TRF receiver in a different manner, two RF amplifier stages and an anode bend detector, no reaction control needed. Only two tuned circuits compared with the Murphy's three.
Geordie McBoyne.
