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Vintage Radio (domestic) Domestic vintage radio (wireless) receivers only. |
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21st Mar 2018, 10:21 pm | #21 | |
Octode
Join Date: Apr 2016
Location: Ventnor, Isle of Wight, & Great Dunmow, Essex, UK.
Posts: 1,377
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Re: Marconi model 557
Quote:
The IW4/500 gave 395V across the reservoir capacitor The rectifier I have settled on, mainly because it gave almost the correct HT, was in a box marked IW4/350 and then in pencil R2, R42. It is clearly none of these as it's obvious that the electrode structure does not incorporate a cathode. Looking at the 'r type' site, it looks like a DW4 directly heated type. Hopefully, some axial electrolytics will turn up from RS tomorrow, so I can tidy up the components just tacked in to make it work. I can then continue to fault find the RF stage. All the best Nick |
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