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Old 11th Oct 2019, 10:39 pm   #30
deliverance
Heptode
 
Join Date: Apr 2015
Location: Manchester, UK.
Posts: 709
Default Re: Marconi NS702 / 2207E, SN 623 (Atlanta type) receiver

Hi all. Just to update on what's been done to the receiver the caps in the mains filter have been changed with y type capacitors and a new mains lead fitted . Quite a few 0.1uf capacitors were physically leaking and others measured high so i changed all of them on the various boards along with some others . The small value caps in the rf , oscillator, amp sections have not been touched . The caps on the output transformer and rf filter have been changed . Then checked the resistors again a fair few needed replacing . All the valve sockets had a good clean and the valves checked all okay except a low ECH 81 which I will replace . I had already changed some rectifier's . After this the receiver works quite well but not as it should the AGC was all over the place and the noise limiter didn't work so out came the AGC can I found it very fiddelly to remove but was careful on doing so . A couple of resistors were four fives times higher than than they should be so changed them also replaced two rectifiers with diodes and the refiitted the can . The set now works so much better the AGC is fine and the noise limiter works the rf gain is better as is the volume even with the small internal speaker i still have a few things to sort out but on the whole very happy with it .. The only problem I have is that band 6 is dead ! can anyone help with this as I am stumped cheers Chris .

Last edited by deliverance; 11th Oct 2019 at 10:50 pm. Reason: Info
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