05-02-2017, 11:12 AM
(This post was last modified: 05-02-2017, 11:14 AM by Geordie McBoyne.)
Hi Trevor,
looking though the circuits of the valve radios in the 1958/59 Radio and Television servicing book we find that most manufactures had adopted the additional tuning capacitor across the local oscillator coil primary for long wave coverage. However, the full LW coverage of 1000 to 2000 metres can not be quite as good as the separate oscillator coil.
The oscillator coil was fitted yesterday. A bracket was found to mount it well away from the rear edge of the chassis. The original TRF coupling coil was fitted on the rear edge of the chassis but because the new coil has an adjustment screw for the tuning slug I had no other choice but to fit it in the position shown in the attachment. The oscillator coil is now closer to the waveband switch which can't be a bad thing, keeps leads short.
Geordie McBoyne.
looking though the circuits of the valve radios in the 1958/59 Radio and Television servicing book we find that most manufactures had adopted the additional tuning capacitor across the local oscillator coil primary for long wave coverage. However, the full LW coverage of 1000 to 2000 metres can not be quite as good as the separate oscillator coil.
The oscillator coil was fitted yesterday. A bracket was found to mount it well away from the rear edge of the chassis. The original TRF coupling coil was fitted on the rear edge of the chassis but because the new coil has an adjustment screw for the tuning slug I had no other choice but to fit it in the position shown in the attachment. The oscillator coil is now closer to the waveband switch which can't be a bad thing, keeps leads short.
Geordie McBoyne.
