Marconi CR300 drum drive - UK Vintage Radio Repair and Restoration Discussion Forum

Malcolm G6ANZ · 11th Apr 2020, 5:48 pm

A plea for sanity. I have to re-thread the drum drive on the CR300 as there wasn't one there when I got given the set so I'm starting from zero.
After many attempts I have got the string around the switch drum, under the chassis, hopefully in the correct cw/ccw winding. The manual then ,glibly, states to tie on the spring and fit the spring into hole on the drum.
How is this possible? I have tried a couple of times to fit the spring with the string tied on to it and always end up with the string coming loose and tying itself in knots around the shaft.

Has anyone succeeded id performing this operation, if so how?

Malcolm

ms660 · 11th Apr 2020, 6:08 pm

Mine was pig but do able in the end:

https://www.vintage-radio.net/forum/...ad.php?t=77128

Lawrence.

11th Apr 2020, 5:48 pm	#1
Malcolm G6ANZ Octode Join Date: Feb 2006 Location: Bristol, UK. Posts: 1,042	Marconi CR300 drum drive A plea for sanity. I have to re-thread the drum drive on the CR300 as there wasn't one there when I got given the set so I'm starting from zero. After many attempts I have got the string around the switch drum, under the chassis, hopefully in the correct cw/ccw winding. The manual then ,glibly, states to tie on the spring and fit the spring into hole on the drum. How is this possible? I have tried a couple of times to fit the spring with the string tied on to it and always end up with the string coming loose and tying itself in knots around the shaft. Has anyone succeeded id performing this operation, if so how? Malcolm

11th Apr 2020, 6:08 pm	#2
ms660 Dekatron Join Date: Apr 2011 Location: Cornwall, UK. Posts: 13,454	Re: Marconi CR300 drum drive Mine was pig but do able in the end: https://www.vintage-radio.net/forum/...ad.php?t=77128 Lawrence. Last edited by ms660; 11th Apr 2020 at 6:25 pm. Reason: addition