UK Vintage Radio Repair and Restoration Powered By Google Custom Search Vintage Radio Service Data

Go Back   UK Vintage Radio Repair and Restoration Discussion Forum > Specific Vintage Equipment > Vintage Radio (domestic)

Notices

Vintage Radio (domestic) Domestic vintage radio (wireless) receivers only.

Reply
 
Thread Tools
Old 17th Jun 2019, 7:26 pm   #61
stofbj1
Triode
 
Join Date: Sep 2018
Location: Killarney, Co. Kerry, Republic of Ireland
Posts: 27
Default Re: Help to identify old Philips valve radio. BIF 571A.

Great finally figured out that the cap (black) I could not read is c51, its going to ground on one end, to a 0.22M & 0.1M resistor R5 & R28.
So the film caps I will need are
2 x 15000pF (0.01uf) for C52 & C54
1 X 2200pF (0.0022uf) for c47
1 X 100nF (0.1uf) for c51

I will empty the main filter cap can and install two 50uF electrolytic inside, connect the two negatives together and solder them onto the outside can, this should do for this.

And then cross fingers and toes
stofbj1 is offline   Reply With Quote
Old 17th Jun 2019, 7:49 pm   #62
Maarten
Nonode
 
Join Date: Dec 2007
Location: Haarlem, Netherlands
Posts: 2,380
Default Re: Help to identify old Philips valve radio. BIF 571A.

The main filter might not need replacing.

If you decide to restuff it, make sure the new capacitors can withstand the ripple current. Many modern parts don't. You'd be looking for the very long, narrow ones used in LCD TV power supplies, or the short stubby ones with snap in pins. Even then, make sure to have a look at the datasheet first. The 100Hz ripple rating should be somewhere in the range of 300-500mA if I remember correctly.

Quote:
Originally Posted by paulsherwin View Post
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.
I noticed in the service manual that lots of key parts - including the cabinet - have Dutch part numbers. This fits into the idea that the set may have been partially based upon some Dutch export or CKD model. Models that often didn't have FM, so the addition of a British FM part makes extra sense within that context as well; in any case the FM tuner looks very non-continental, so that may have been one of the British surplus legacy parts.

Last edited by Maarten; 17th Jun 2019 at 8:00 pm.
Maarten is online now   Reply With Quote
Old 17th Jun 2019, 9:23 pm   #63
simpsons
Hexode
 
Join Date: Feb 2007
Location: Harrow, London, UK.
Posts: 419
Default Re: Help to identify old Philips valve radio. BIF 571A.

Unless I've missed something, why are you changing capacitors willy nilly?

The first check must be if there is any DC on the grid of V6 it should not be positive. If it is hook in anything from 0.01uF to whatever @ 300vdc working.

Move then onto HT, then V5a and V6 anodes. The schematic will tell you what should be there. If there little or no hum from the speaker and the HT is OK, the main smoothing is probably OK. No need to stuff anything.

Should these be within spec, the cathode bypass C3 would be my next choice.

The loudness capacitors are unlikely to be short circuit
simpsons is offline   Reply With Quote
Old 17th Jun 2019, 10:01 pm   #64
stofbj1
Triode
 
Join Date: Sep 2018
Location: Killarney, Co. Kerry, Republic of Ireland
Posts: 27
Default Re: Help to identify old Philips valve radio. BIF 571A.

Quote:
Originally Posted by simpsons View Post
Unless I've missed something, why are you changing capacitors willy nilly?

The first check must be if there is any DC on the grid of V6 it should not be positive. If it is hook in anything from 0.01uF to whatever @ 300vdc working.

Move then onto HT, then V5a and V6 anodes. The schematic will tell you what should be there. If there little or no hum from the speaker and the HT is OK, the main smoothing is probably OK. No need to stuff anything.

Should these be within spec, the cathode bypass C3 would be my next choice.

The loudness capacitors are unlikely to be short circuit
Will nilly, capacitors that are 70 odd years old, I don't think so, as already stated they measure ok, but are probably leaky at this stage, and for the sake of the cost of 4 film capacitors, it's a safe bet to do, for not only safety reasons, but for preventing future failures. I think the main power filter cap is OK and I will leave this be for now, there is no hum or buzzing. When the caps have been replaced, then I will safely take voltage readings without damaging any further components, i.e valves. " The schematic will tell you what should be there" not the one I am looking at, no voltages given. "The loudness capacitors are unlikely to be short circuit" as already stated if you read through the thread, none are shorted or open circuit for that matter. But possibly leaky.
stofbj1 is offline   Reply With Quote
Old 17th Jun 2019, 10:03 pm   #65
Station X
Moderator
 
Station X's Avatar
 
Join Date: Jan 2003
Location: Ipswich, Suffolk, IP4, UK.
Posts: 14,744
Default Re: Help to identify old Philips valve radio. BIF 571A.

The voltages are in a table on another sheet of the service manual on RM.
__________________
Graham. Forum Moderator

Keep the soldering iron hot.
Station X is online now   Reply With Quote
Old 17th Jun 2019, 10:17 pm   #66
stofbj1
Triode
 
Join Date: Sep 2018
Location: Killarney, Co. Kerry, Republic of Ireland
Posts: 27
Default Re: Help to identify old Philips valve radio. BIF 571A.

Quote:
Originally Posted by Station X View Post
The voltages are in a table on another sheet of the service manual on RM.
Great thanks for that, I will have to wait till tomorrow, as I have reached my 3 download limit.
Just in the process of ordering some Axial vishay film caps (rated at 630v). Will update the post when installed, and hopefully that is the issue, if not I will take some voltage readings.

Regards
stofbj1 is offline   Reply With Quote
Old 17th Jun 2019, 11:32 pm   #67
simpsons
Hexode
 
Join Date: Feb 2007
Location: Harrow, London, UK.
Posts: 419
Default Re: Help to identify old Philips valve radio. BIF 571A.

Philips Black wax coated capacitors can fail but they are not Hunts which should be changed on sight. My message was not to belittle you but to help you narrow down the fault.

Should you feel you should change all before checking the DC levels, don't forget C55.

Good luck

Chris
simpsons is offline   Reply With Quote
Old 17th Jun 2019, 11:41 pm   #68
Maarten
Nonode
 
Join Date: Dec 2007
Location: Haarlem, Netherlands
Posts: 2,380
Default Re: Help to identify old Philips valve radio. BIF 571A.

The black ones WILL fail sooner or later as they are molded impregnated paper capacitors, but indeed they won't be as bad on average as the hunts, ero, wima or rifa ones.

That said, it would make sense to replace "that" capacitors on sight, and replace the others only after a bit of troubleshooting - if only to prevent introducing new failures.
Maarten is online now   Reply With Quote
Old 19th Jun 2019, 10:55 pm   #69
stofbj1
Triode
 
Join Date: Sep 2018
Location: Killarney, Co. Kerry, Republic of Ireland
Posts: 27
Default Re: Help to identify old Philips valve radio. BIF 571A.

Hi all,
Just an update, I got the new Vishay film caps today and replaced them all, and it sounds much better now, before the sound would start drifting away and sometimes come back, which is now fixed. It's still not super loud, but I have never heard one of these, So I do not know what to expect'(I do have a valve BUSH record player which goes a lot louder). Anyway I have oiled and re lubricated all the moving parts, to prevent the tuning cord from snapping. I have not taken an voltages, as I am already over the moon with even getting sound out of this. Thanks everyone for your help with this, It's nice to get it going and hopefully prevent any future failures to the valves. Oh "simpsons" no offence taken by the way. I had the Hunts in my Bush record player, they were bad alright.
stofbj1 is offline   Reply With Quote
Old 20th Jun 2019, 12:28 am   #70
Mike. Watterson
Heptode
 
Join Date: Dec 2014
Location: Limerick, Ireland.
Posts: 733
Default Re: Help to identify old Philips valve radio. BIF 571A.

It should go louder than you'd want.
Still, good progress.
PM me if you are ever heading to Limerick, I'm on the "Killarney" side outside the city.
Mike. Watterson is online now   Reply With Quote
Reply

Thread Tools



All times are GMT +1. The time now is 7:36 pm.


All information and advice on this forum is subject to the WARNING AND DISCLAIMER located at https://www.vintage-radio.net/rules.html.
Failure to heed this warning may result in death or serious injury to yourself and/or others.


Powered by vBulletin®
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Copyright ©2002 - 2019, Paul Stenning.