1920s Set of Six McMichael Hesketh MH Barrel Type HF Transformers

This is a 1920s Set of Six McMichael Hesketh MH Barrel Type HF Transformers. 

They come with their original leather covered box with faux silk and velvet lining, which is in fairly good condition with a few tears, scuffs and surface blemishes.

The six McMichael transformers cover the range 80-7000 metres and are in excellent condition.

Each transformer is marked:- 

Rd DSN no. 705426 (dates to 1924)

0.0003 µF across Primary

Range of Each Transformer (Metres)

1. 80-150
2. 150-300
3. 300-600
4. 550-1200
5. 1100-3000
6. 2500-7000

Two small leaflets are included; the one on 'Neutrodyning' refers you to page 326 of the Wireless Constructor- Feb 1925!

• L McMichael Ltd were Radio Engineers based at Hasting House, Norfolk St, Strand WC.
• B Hesketh Ltd were Scientific Instrument Makers in Slough, UK

In 1922 the two companies merged and adopted the trade-mark MH (McMichael Hesketh).

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