19-04-2017, 07:07 PM
(This post was last modified: 19-04-2017, 07:22 PM by Geordie McBoyne.)
Hi Alan,
Yes, I must restart the 1804 resto project. I've spent too much time on that Sparton radio. Today, the radio chassis was refitted into the cabinet and the set has been put aside until good medium and long wave aerial coils are found.
So the first task is tidy up the HMV chassis. That interlace filter device must go. I can either return the interlace circuit back to the original EMI single diode arrangement or wire in the two diode interlace filter around the valveholder of V8 (D63/6H6).
The first attachment shows the interlace device which was probably made by the same engineer who modified the RF, the mixer-oscillator and IF amplifiers. The second picture shows the two diode interlace filter as used in the Pilot CV34. The third picture shows the original HMV single diode interlace filter.
Geordie McBoyne.
Yes, I must restart the 1804 resto project. I've spent too much time on that Sparton radio. Today, the radio chassis was refitted into the cabinet and the set has been put aside until good medium and long wave aerial coils are found.
So the first task is tidy up the HMV chassis. That interlace filter device must go. I can either return the interlace circuit back to the original EMI single diode arrangement or wire in the two diode interlace filter around the valveholder of V8 (D63/6H6).
The first attachment shows the interlace device which was probably made by the same engineer who modified the RF, the mixer-oscillator and IF amplifiers. The second picture shows the two diode interlace filter as used in the Pilot CV34. The third picture shows the original HMV single diode interlace filter.
Geordie McBoyne.
