BBC 1959 'Focus' Transistor Radio & DRR2 Coil

[Yorkie]

Thanks for reading the thread Keith, and for your interesting comments about your own experience, and about Repanco. They're very much still in business as Repanco Bartlett, and seem proud of their heritage in that they feature their little one valver on their website under 'About Us'. I rather fear that if we were to ask of they'd still make the DRR2 coil, they'd ROTFL!

http://www.repancobartlett.co.uk/index.p...om_content&view=article&id=2&Itemid=3

I really must finsh the little 'Gingery' hand coil wave winder that I referred to in post 12 and use it to wind some coils. It only needs the wire guide to be made and fitted, and some additional cams for various widths of coil, but I'm not happy with the crude 'bevel gear' arrangement, which is just an 'O' ring on a pully pressed hard against a penny washer coted with wet 'n dry, as can be seen in the drawing. I've decided to fit proper 1:1 bevel gears and yesterday ordered a pair of gears, which cost only £2.24 + £2.88 P&P and to my surprise, arrived today. Excellent outfit called 'motionco' which has a wide range of useful gears, shafts, bearings etc, all of which to my mnd seem keenly priced. Worth a look - see here:

http://www.motionco.co.uk/gears-bevel-ge...32_41.html

I'm not happy about the 'tally counter' to count turns on the coil winder, so I'm going to fit a small pocket calculator and microswitch instead. The switch is wired across the '=' button on the calculator, and when shorted out by the microswitch, increments each turn of the coil. The tally counter lever needs a bit too much pressure with each downward stroke to operate it in my view. I know that lots of these little wave winders have been made, and it was a chum who alerted me to the calculator idea, which he's sucessfully used.

All I need now is the fine gauge Litz wire, which I believe is in the same pigenhole as unicorn horns and hen's teeth! I do have some cotton covered wire, which I think will suffice.