Engineering Confectionery (Comms Receivers) - UK Vintage Radio Repair and Restoration Discussion Forum

turretslug · 9th Nov 2014, 11:42 pm

The link posted by Richard (trh01uk) detailing the highly-regarded Telefunken E52 receiver;

http://www.cdvandt.org/e_52_restoration.htm

reminded me of another site that shows what tax gets turned into when the military decide that they want the best;

http://www.wa3key.com/r390as/r390a.html#

The tuning drive pics will surely appeal to the horologists on the forum.

Colin

Radio Wrangler · 10th Nov 2014, 9:36 am

I can't help but think that the carbon composition resistors don't quite match the quality of the mechanical bits. Perhaps one of the causes of the need for all that modularity?

David

turretslug · 10th Nov 2014, 11:26 am

The disc ceramic caps (decouplers?) in this late (seemingly circa '67 model) are oddly jarring as well- I'm sure that they are perfectly good with nice low self-inductance and leakage and are reliable (not to mention rather cheaper than Sprague Vitamin-Qs!) but they smack of late 'sixties/'seventies consumer kit. Just an impression.

I wonder if there was inertia to change as regards military confidence in componentry that was already around? Those ceramic-tubed carbon comp resistors go badly out of kilter in a lot of British military stuff.

9th Nov 2014, 11:42 pm	#1
turretslug Dekatron Join Date: Nov 2011 Location: Surrey, UK. Posts: 4,395	Engineering Confectionery (Comms Receivers) The link posted by Richard (trh01uk) detailing the highly-regarded Telefunken E52 receiver; http://www.cdvandt.org/e_52_restoration.htm reminded me of another site that shows what tax gets turned into when the military decide that they want the best; http://www.wa3key.com/r390as/r390a.html# The tuning drive pics will surely appeal to the horologists on the forum. Colin

10th Nov 2014, 9:36 am	#2
Radio Wrangler Moderator Join Date: Mar 2012 Location: Fife, Scotland, UK. Posts: 22,870	Re: Engineering Confectionery (Comms Receivers) I can't help but think that the carbon composition resistors don't quite match the quality of the mechanical bits. Perhaps one of the causes of the need for all that modularity? David __________________ Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done

10th Nov 2014, 11:26 am	#3
turretslug Dekatron Join Date: Nov 2011 Location: Surrey, UK. Posts: 4,395	Re: Engineering Confectionery (Comms Receivers) The disc ceramic caps (decouplers?) in this late (seemingly circa '67 model) are oddly jarring as well- I'm sure that they are perfectly good with nice low self-inductance and leakage and are reliable (not to mention rather cheaper than Sprague Vitamin-Qs!) but they smack of late 'sixties/'seventies consumer kit. Just an impression. I wonder if there was inertia to change as regards military confidence in componentry that was already around? Those ceramic-tubed carbon comp resistors go badly out of kilter in a lot of British military stuff.