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Vintage Radio (domestic) Domestic vintage radio (wireless) receivers only. |
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17th Jun 2019, 1:07 pm | #41 | |
Triode
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Re: Help to identify old Philips valve radio. BIF 571A.
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17th Jun 2019, 1:08 pm | #42 |
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Re: Help to identify old Philips valve radio. BIF 571A.
Either that or there are dirty switch contacts. try touching (with a screwdriver blade) the centre tag of the volume control. That should definitely give a buzz.
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17th Jun 2019, 1:10 pm | #43 | |
Dekatron
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Re: Help to identify old Philips valve radio
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The number 1099 underneath, is a factory number. Often not the same as the real serial number. Numbering might have started at 1001. What does the back itself look like? Could you maybe take one or two close up pictures of the station dial? Last edited by Maarten; 17th Jun 2019 at 1:22 pm. |
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17th Jun 2019, 1:16 pm | #44 | |||
Triode
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Re: Help to identify old Philips valve radio
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17th Jun 2019, 1:32 pm | #45 |
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Re: Help to identify old Philips valve radio. BIF 571A.
Testing capacitors for capacitance will not tell you whether they are electrically leaky. To determine this they need to be tested at the working voltage. The set itself will supply the working voltage. This is why checking voltages in a set is such a useful fault finding method.
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17th Jun 2019, 1:46 pm | #46 | |
Triode
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Re: Help to identify old Philips valve radio. BIF 571A.
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it might detect a completely bust cap. (i will have to order some new caps) I have just downloaded the diagram layout, since I can not read some of the values of the large black caps as the righting is faded away, the schematic does not show capacitor values, any idea on top of the schematic are colums S C R, What is this? Last edited by Station X; 17th Jun 2019 at 1:52 pm. Reason: Attachment removed. |
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17th Jun 2019, 1:51 pm | #47 |
Dekatron
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Re: Help to identify old Philips valve radio. BIF 571A.
S,C,R = Inductors, Capacitors, Resistors.....Component numbers, follow the component number down to find its location on the schematic.
I think the component values can be downloaded from radiomuseum but for those that can't be faffed I think the service data for the Philips 353a might have the same/similar values, the 353a doesn't have a magic eye. Radiomuseum will be annoyed if they discover your link to their schematic, they might ban you. EDIT: I notice that the link has since been removed. Lawrence. Last edited by ms660; 17th Jun 2019 at 2:08 pm. Reason: Extra info |
17th Jun 2019, 1:52 pm | #48 |
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Re: Help to identify old Philips valve radio. BIF 571A.
Sorry, but you cannot post entire documents lifted from RM on here.
ESR is only applicable to electrolytic capacitors. I've never found the need to measure it in valve sets. Faulty smoothing capacitors will show up as hum, over heating or low HT. Faulty cathode bypass caps (C3 for example) will show up as incorrect cathode voltage. For cap values consult the parts list.
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17th Jun 2019, 2:06 pm | #49 | ||
Triode
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Re: Help to identify old Philips valve radio. BIF 571A.
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17th Jun 2019, 2:27 pm | #50 | |
Heptode
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Re: Help to identify old Philips valve radio
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It has to have been for UK FM radio by Cable TV and UK Radio via big masts in Dublin area (for Belfast or Wales, likely Band 1 TV aerials would have picked up UK Band II Radio). Obviously border regions would haveI'd mistakenly thought VHF Radio started the the same year as TV (which was technically 1961), but I'm told it was 1966! [Edit: I'm sceptical about 1966, but there might only have been a more limited service from late 1961, maybe from one of the TV sites. Not Athlone AM site, it's useless for VHF. I've no idea where the lower power Dublin and Cork AM transmitters where, which had separate frequencies and programs till 1939. I didn't live in this part of Ireland till 1983 and I'm sure we had only AM in the car when visiting in the 1960s. I do remember Downtown Radio and Radio Ulster starting in NI and we used an imported Grundig for Manx Radio on VHF. We did have VHF on a Decca RG100 and later a Murphy A272 in Belfast in the early 1960s] By 1963 or 1964 the valve sets were gone? Last edited by Mike. Watterson; 17th Jun 2019 at 2:41 pm. Reason: Sceptical |
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17th Jun 2019, 2:34 pm | #51 |
Heptode
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Re: Help to identify old Philips valve radio. BIF 571A.
Indeed, if you download anything from RMorg and repost it anywhere, you'd get banned from that site, even if it's a public domain item.
Also you can't post any complete schematic here that's sold by this site. Both of these rules are reasonable clear parts of the terms and conditions of memberships of the sites. |
17th Jun 2019, 2:36 pm | #52 |
Triode
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Re: Help to identify old Philips valve radio. BIF 571A.
Still after all the trouble finding the schematic diagram, the next hurdle is the find the capacitor values that are unreadable.
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17th Jun 2019, 2:38 pm | #53 |
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Re: Help to identify old Philips valve radio. BIF 571A.
Yes, 1966 would have been very late for a valve FM set, though the Bush VHF81 was still being made then.
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17th Jun 2019, 2:51 pm | #54 |
Heptode
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Re: Help to identify old Philips valve radio. BIF 571A.
These may be identical, except for no magic eye.
https://www.radiomuseum.org/r/philips_353a.html https://www.radiomuseum.org/r/philips_g74a.html They may be on the sales list on this site. The audio coupling (g2 to 0V, Anodes to g1, tone controls and on the output transformer) are not very critical in value. Likely they all need replaced and will test perfect for ESR and value. It's the leakage current when more than 100V is on them is the issue. |
17th Jun 2019, 2:57 pm | #55 |
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Re: Help to identify old Philips valve radio
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17th Jun 2019, 3:08 pm | #56 |
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Re: Help to identify old Philips valve radio. BIF 571A.
It does look as if Philips Ireland just took the 353A chassis and built a nice wooden cabinet for it, adding a magic eye. I wonder if Philips GB had stopped production by then and had some surplus parts and tooling.
The big Philips 'black pitch' caps will all be coupling or decoupling caps and can safely be replaced with 0.047uF modern types, though it's obviously good practice to match the original values if possible. The only exception might be in the tone control circuit. |
17th Jun 2019, 4:11 pm | #57 |
Heptode
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Re: Help to identify old Philips valve radio. BIF 571A.
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17th Jun 2019, 4:13 pm | #58 |
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Re: Help to identify old Philips valve radio. BIF 571A.
Like I said the capacitor values are given in the parts list which forms part of the service manual and is downloadable from RM.
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17th Jun 2019, 5:45 pm | #59 | |
Triode
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Re: Help to identify old Philips valve radio. BIF 571A.
Quote:
Thanks everyone for your help, I going to start with replacing the capacitors as these are well overdue, hopefully this will fix my issue. |
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17th Jun 2019, 6:11 pm | #60 |
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Re: Help to identify old Philips valve radio. BIF 571A.
You'll need to download the pages one at a time.
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