Superhet set HMV 438 Schematic help pls - diyAudio
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Old 30th March 2015, 01:48 PM   #1
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Default Superhet set HMV 438 Schematic help pls

Hello all you DIY audio enthusiasts!
I have been lurking this site for some time now and its great!
So here i am in need of some assistance please.

I have acquired an HMV 438 super heterodyne set in need of some care and attention and since she is so beautiful I can't resist. Inside this beauty is a huge power trafo, a whopping FW4/500 rectifier, other valves I can make out are 2 tetrodes S4VB and VMS4. The remaining is the output stage power triode but i can't tell what it is from the marking but looks something like a PX4.
Would anyone have, or be kind enough to share a schematic for this model or at least the most likely valve line up and schematic / wiring diagram please. I would love to see this old set brought back to life. I will be testing the transformers when I have time, and replacing caps etc. It would save me a great deal of time not to have to draw the schematic from the spaghetti inside.

Thank you very kindly for reading my first post
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Old 30th March 2015, 02:49 PM   #2
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This may be helpful; UK Vintage Radio Repair and Restoration - HMV 438
Support for Flying Mole, Allen & Heath, Valve amps, older designs & 2CVs.

Last edited by JonSnell Electronic; 30th March 2015 at 02:55 PM.
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