MULLARD MODEL 537 (1947)

The Mullard model 537 was manufactured for C. & A. Odlin Ltd by Philips Electrical Industries of N.Z. Ltd in 1947.

Other radios based on the same chassis:

5-valve dual wave radio.

Rebranded Philips model 648

Technical Information

Valves (5): ECH35, EF39, EBC33, 6V6GT, 6X5GT

Intermediate Frequency: 455kc/s

Frequency Bands: 2

Chassis Notes(most schematics can be clicked to download a full size version)

NOTE: The side knobs are not, as they appear at first glance, slide-on.  There are holes underneath that allow you to access the screw that runs right through the shaft and knob (not just a grub screw, they need to be fully extracted).  Once both knobs are removed there are also two screws (one each side) near the top of the chassis dial which need to be uncrewed as well.  See photos below for clarification.

1947 Philips model 648

1947 Philips model 648

1947 Philips  model 648

1947 Philips 648V

1947 Philips 648V

General Construction Notes for Philips Electrical Industries of N.Z. Ltd:

Model codes are explained on the Philips brand page.  Philips early-mid century were probably the Google of their time - they had branches in many countries and a global brand that everyone knew - and were apparently happy to let engineers come up with new ideas and implement them.  Construction is often overly complex but very well engineered - although repairs can also take a complex path.  They used time-in-motion studies to find the most cost effective way to asemble sets and sometimes this means repairs can be nightmarish (if you've ever worked on a V7A Theaterette this will be all too aparent).  U suffix model numbers are transformerless (hot chassis) sets and great care should be taken, or the sets avoided altogether.

Other documented models using this chassis (4 in total)

1947 Philips model 648
1947 Philips model 647
1947 Philips 648V