Steve
Society Members
vintageradio.co.nz
Posts: 724
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Post by Steve on Aug 15, 2022 10:08:59 GMT 12
Hi, it sounds like you've done quite a bit of work. Can I ask what you mean by all original parts even the replaced ones? I've heard of people replacing capacitors with new-old-stock ones, but this is a recipe for disaster - particularly if you want to use it on a daily basis. The HMV 471 was sold here in reasonable numbers, and the valve lineup is American, and pretty standard for the mid-30's. The society holds the service data and the users manual. I have one of these in my to-do queue because I particularly like the look of them, and the purple dial. Service data: nzvrshome.files.wordpress.com/2018/12/HMV-471-6V-AWAC-1936.pdfUsers manual: nzvrshome.files.wordpress.com/2018/12/HMV-471-operating-manual.pdfI can't help with the Telefunken - I don't personally have any kind of affinity for most of the European sets and so have never looked into documentation for them - but UK / Euro sites should be able to help there. Of course there will be others here who might be able to help.
One place I recommend you have a look if you haven't already, is PapersPast. A quick search for 'HMV 471' or 'model 471' should lead you to a wide array of advertising from the period they were sold.'
Regarding the records - I would think the way they are mastered is more important than the medium they are mastered on - particularly when played through old systems like you have. If you're playing old records then they will all likely be analogue all the way through, but modern ones will likely be digital right up to the pressing. At which point they are analogue, complete with clicks and pops from the dust on the record surface.
Cheers, Steve
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Post by Peter Walsham on Aug 15, 2022 16:26:30 GMT 12
I have a word or two of caution for you. If you haven't replaced the main HT filter capacitors with NEW ones, then I would strongly suggest that you do so. DO NOT use old or used parts here, as a short circuit fault in either of these capacitors (particularly the 1st filter capacitor) will almost certainly wreck the rectifier valve & probably burn out the power transformer. Also, I wouldn't use a used capacitor for the 2nd audio coupling capacitor either, as leakage (even a small leakage) through one of these causes the output valve to draw excessive current, and this puts a huge strain on the output transformer, and is very likely to burn out the output transformer, not to mention a strain on the output valve and other parts.
Peter
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