UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Marconi NS702 / 2207E, SN 623 (Atalanta type) receiver

G6Tanuki · 12th Oct 2019, 11:17 am

Ah, that suggests the LO is working but you've got a gain-reduction issue in the front-end signal-frequency circuit of band-6.

One thing quick and easy to check is the continuity of the antenna-coupling winding on band 6; in the past I've seen receivers with this burned-out (after a lightning strike?) on one band, causing deafness.

If it's not that, then check the DC resistance of the various coil-windings on band-6 then compare the values with those for the windings on adjacent bands to see if they're similar. That your receiver works OK on other bands means the problem should be easier to identify than total-failure!

12th Oct 2019, 11:17 am	#34
G6Tanuki Dekatron Join Date: Apr 2012 Location: Wiltshire, UK. Posts: 14,005	Re: Marconi NS702 / 2207E, SN 623 (Atalanta type) receiver Ah, that suggests the LO is working but you've got a gain-reduction issue in the front-end signal-frequency circuit of band-6. One thing quick and easy to check is the continuity of the antenna-coupling winding on band 6; in the past I've seen receivers with this burned-out (after a lightning strike?) on one band, causing deafness. If it's not that, then check the DC resistance of the various coil-windings on band-6 then compare the values with those for the windings on adjacent bands to see if they're similar. That your receiver works OK on other bands means the problem should be easier to identify than total-failure!