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Old 17th Jun 2019, 11:23 am   #21
Mike. Watterson
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Default Re: Help to identify old Philips valve radio

It's got the separate VHF tuner (2 x EF80), and bottom scale looks like VHF.

It can't be Philips Ireland unless they were making or rebadging AM/FM sets for the few areas with VHF reception from UK. It looks like it has channel numbers on VHF, which would suggest a German import.

I think VHF radio started just before VHF TV (which was 31st Dec 1961, 405 in areas that already had TVs for BBC/ITV and 625 VHF elsewhere.) There was also only simulcast with the sole Irish station, however BBC didn't have much more than simulcast of three stations till 1971 in most places.

VHF-FM started in 1949 in Germany.
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Old 17th Jun 2019, 11:24 am   #22
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Default Re: Help to identify old Philips valve radio

4700 pF ? I will measure it out of circuit
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Old 17th Jun 2019, 11:28 am   #23
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Default Re: Help to identify old Philips valve radio

Ok its reading 5.32nF out of circuit so looks ok, so that is not my issue. Really need a schematic, the volume pot has been cleaned and its reading fine.
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Old 17th Jun 2019, 11:28 am   #24
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Default Re: Help to identify old Philips valve radio

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Originally Posted by stofbj1 View Post
I just found a marking on it on the bottom 4k7 is this a capacitor then?
Looks like one to me, value = 4.7nF aka 4,700pF or 0.0047uF.

EDIT: Post crossed.

Lawrence.
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Old 17th Jun 2019, 11:29 am   #25
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Default Re: Help to identify old Philips valve radio

Valve line up please.
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Old 17th Jun 2019, 11:30 am   #26
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Default Re: Help to identify old Philips valve radio

The internal one that loops around the chassis, There is another place to plug it into on the back but when I use these two ports there is nothing at all, so I presume I have it connected to the correct place
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Old 17th Jun 2019, 11:35 am   #27
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Default Re: Help to identify old Philips valve radio

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Valve line up please.
What do you mean valve line up? I have no valve test equipment, voltmeter and capacitor is all the equipment I have.
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Old 17th Jun 2019, 11:41 am   #28
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Default Re: Help to identify old Philips valve radio

The piano key models came in about 1953/1954 in Germany. The Noval models also about 1954.
Also it has EM80 rather than EM34 style eye.

It has to be a rare 1954 / 1955 model if it has the VHF and Noval as even in 1953 most were rimlock?
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Old 17th Jun 2019, 11:42 am   #29
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Default Re: Help to identify old Philips valve radio

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Originally Posted by stofbj1 View Post
What do you mean valve line up? I have no valve test equipment, voltmeter and capacitor is all the equipment I have.
Station X meant "Which valve types are fitted in this radio?"
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Old 17th Jun 2019, 11:43 am   #30
Mike. Watterson
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Default Re: Help to identify old Philips valve radio

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What do you mean valve line up? I have no valve test equipment, voltmeter and capacitor is all the equipment I have.
He means what numbers on the valves. If no number, what number of pins and if near tuner, IFT cans, audio transformer etc,
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Old 17th Jun 2019, 11:44 am   #31
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Default Re: Help to identify old Philips valve radio

The "MKxxx xx" part numbers on the mains transformer and other parts are UK Philips part numbering.

It looks like the actual model number label has come adrift from the rear of the chassis (glue residue visible) and, I expect, the back cover as well.
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Old 17th Jun 2019, 11:46 am   #32
Mike. Watterson
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Default Re: Help to identify old Philips valve radio

Could be this model:
https://www.radiomuseum.org/r/philips_bif_571a.html

I can't imagine very many people had VHF reception in 1958 in Ireland.
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Old 17th Jun 2019, 11:52 am   #33
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Default Re: Help to identify old Philips valve radio

The tuner design is rather old fashioned for 1958.

Mike, when did RTE start VHF (presumably from Athlone)? I wondered above if this might have been the Philips Ireland launch model for the new service.
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Old 17th Jun 2019, 12:10 pm   #34
stofbj1
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Default Re: Help to identify old Philips valve radio

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Originally Posted by dazzlevision View Post
Station X meant "Which valve types are fitted in this radio?"
I thought that alright but as I already mentioned the majority have no markings on them, there is a mullard for the tuning (meter) the rest are unmarked

Quote:
Originally Posted by Mike. Watterson View Post
Could be this model:
https://www.radiomuseum.org/r/philips_bif_571a.html

I can't imagine very many people had VHF reception in 1958 in Ireland.
That's it by the looks of it

Quote:
Originally Posted by dazzlevision View Post
The "MKxxx xx" part numbers on the mains transformer and other parts are UK Philips part numbering.

It looks like the actual model number label has come adrift from the rear of the chassis (glue residue visible) and, I expect, the back cover as well.
That is right, the label is missing, and nothing else on the back cover
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Old 17th Jun 2019, 12:15 pm   #35
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Default Re: Help to identify old Philips valve radio. BIF 571A.

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Originally Posted by Mike. Watterson View Post
Could be this model:
https://www.radiomuseum.org/r/philips_bif_571a.html

I can't imagine very many people had VHF reception in 1958 in Ireland.
Well done Mike.

Having downloaded the service from RM the OP will be in a position to check voltage readings starting with the rectifier, HT supply and output valve.
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Old 17th Jun 2019, 12:20 pm   #36
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Default Re: Help to identify old Philips valve radio. BIF 571A.

I just gave the variable tuning capacitor metal plates another clean out and attached a long piece of speaker cable to the already installed VHF aerial (also cleaned plugs with fine sandpaper) and its got a bit louder, but still no where near what it should be(we do have bad FM reception here), I also checked the rest of the black style capacitors (value of 1 is unreadable and two can caps, one 100uF was reading 168uf so replaced this. The rest seem ok( out of circuit), but should probably replace all the black ones with 400v film caps. And also the main filter cap, 50+50uF can cap has two poles on top, and I presume the metal case it the common negative.
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Old 17th Jun 2019, 12:25 pm   #37
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Default Re: Help to identify old Philips valve radio. BIF 571A.

Also forgot to mention the pilot light is blown, the one to illuminate the dial, I presume this does not double up as some sort of fuse?
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Old 17th Jun 2019, 12:34 pm   #38
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Default Re: Help to identify old Philips valve radio. BIF 571A.

If the pilot light were a fuse the radio wouldn't work at all.

If you're going to replace components, rather than using fault finding procedures, I suggest you start with the audio coupling capacitors C52 and C54. If these are electrically leaking they may destroy the output transformer, output valve and mains transformer.
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Old 17th Jun 2019, 12:41 pm   #39
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Default Re: Help to identify old Philips valve radio. BIF 571A.

Circuit extract attached.

I note that the radio has a Pick Up (PU) socket. If you switch to gram and touch the socket with a screwdriver blade a LOUD buzz will indicate that the audio stages are working correctly.
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Old 17th Jun 2019, 1:04 pm   #40
stofbj1
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Default Re: Help to identify old Philips valve radio. BIF 571A.

Quote:
Originally Posted by Station X View Post
Circuit extract attached.

I note that the radio has a Pick Up (PU) socket. If you switch to gram and touch the socket with a screwdriver blade a LOUD buzz will indicate that the audio stages are working correctly.
Hi, yes it has 2 x two sets of sockets at the bottom of the chassis, I was wondering what these were for, I used a screwdriver and there is no loud buzz when set to gramophone from either sockets, so an issue with the output stage?
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