31-10-2023, 12:23 PM
(This post was last modified: 31-10-2023, 12:26 PM by Geordie McBoyne.)
Yesterday, during another clear out of junk upstairs above the shop a tatty but complete Murphy A4 was found.
The A4 is similar to many other makes of superhet receiver made in 1933 having a pentode valve to perform the function of the frequency changer.
Murphy employed the Mazda AC/PEN.
The following year in the UK specific frequency changer valves were introduced. The Mazda AC/TP in the Murphy A24.
Philips AK1 and Mullard FC4 octodes.
The pentagrid converter 6A7 was announced in 1933.
Geordie McBoyne.
The A4 is similar to many other makes of superhet receiver made in 1933 having a pentode valve to perform the function of the frequency changer.
Murphy employed the Mazda AC/PEN.
The following year in the UK specific frequency changer valves were introduced. The Mazda AC/TP in the Murphy A24.
Philips AK1 and Mullard FC4 octodes.
The pentagrid converter 6A7 was announced in 1933.
Geordie McBoyne.
