Philips 1756U - UK Vintage Radio Repair and Restoration Discussion Forum

linescan87 · 21st Sep 2016, 12:09 am

About to embark on the restoration of one off these sets. Anyone got one? Obviously all the black caps will have to go. Looks a good set looking at the circuit.

FERNSEH · 21st Sep 2016, 10:06 am

Some time ago I received an enquiry from a customer about restoring a Philips 1757U which is the console version of the 1756U.
It's most likely that almost those black tar goudron capacitors will need replacing.
Comprehensive service data for this set can be found in the 1956/57 Radio and Television servicing book.
The 1756U is a high performance receiver designed for use in fringe areas.
The vision IF amplifier has three EF80 stages. A proper sync cancelled vision AGC system and flywheel line synchronising.

DFWB.

Peter.N. · 21st Sep 2016, 1:12 pm

I had a few of these out on rent in the '60s and they proved to be very reliable sets. Don't remember much about them now apart from the pitch capacitors but they were common to most Philips stuff of the time.

Hope the restoration goes well.

Peter

jayceebee · 21st Sep 2016, 8:13 pm

This was a set our family had when I was a child, I obtained one just over a year ago after searching for a very long time. I haven't done a lot with it due pressures of work (I was working in and around Dublin last week during the bus strike

). My grandparents and two other relatives also owned them but each had very slight differences in cabinet presentation. I'd be interested to see yours.

After replacing the only the mains filter capacitor I managed to get a picture and sound but the set has a frame fault. One thing to watch out for is the dreaded partial short on the CRT heater, the gun assembly used in the MW43-64 and other Mullard CRTs of this era were very prone to this. Although mine is afflicted as I only read 4v the emission appears to be good.

You can see here how far I got with it. It's in a warm dry place just waiting for further work.

I'm looking forward to see how you progress, faster than me probably.

John.

linescan87 · 18th Oct 2016, 10:52 pm

Good evening all,

Got the chassis out this evening. Hope to make a start soon.

Fernseh thankfully I Have the 56/57 Red book. Jayceebee mine looks to have been kept warm and dry for its life. I bought it off the granddaughter of late a Philips employee. I reckon it should be fairly straightforward hopefully.

Regards,
John Joe.

Tazman1966 · 11th Nov 2016, 6:54 pm

Any joy with this old Philips yet?

linescan87 · 11th Nov 2016, 8:04 pm

Hi Tas,

Still a work in progress. I'm half way through re-capping it. Got a new EHT rectifier valve (EY51) for it as one of heater wires had broken off just under glass lip.

The caps are all very leaky indeed.

Cheers,
John Joe.

Heatercathodeshort · 12th Nov 2016, 12:59 pm

Not sure of the model number of this one. It came by way of a customer in 1975. It worked quite well back then but has not been touched since. It came from Southfields London SW18 so it is probably the non fringe 1446U type chassis.
Should be easy to get going. The LOPT is 100% reliable.It appears to have a replacement Mullard MW43-69 tube so there is hope. I'll put it back on the 'to do' pile..
Regards, John.

AidanLunn · 13th Nov 2016, 12:13 am

HKS, that's a Philips 1747U, IIRC. I remember seeing one of these in a local BHF charity shop, but was only for sale through their eBay account. I missed the end of the auction and consequently the set

There is one on Gumtree in Bristol, that I linked to in the "where to get sets" section.

linescan87 · 14th Nov 2016, 1:37 pm

Hi John,

Thats a nice looking set, hopefully it won't have to wait too long! Am I right in thinking the first two digits of the model number refere to the tube size?

Cheers,
John Joe.

linescan87 · 26th Dec 2016, 7:41 pm

Hi all,

Hope everyone is having a good Christmas. Sadly life got in the way of this one (jury duty for starters).

Hopefully will crack on in the new year.

Regards,
John Joe.

linescan87 · 22nd Mar 2017, 3:04 pm

Hi All,

I finally got back around to this set. Having replaced most of the caps I put the chassis back in the cabinet.

When I powered up I had no line drive. I disconnected the screen grid resistor from the line output valve and began too check around the line oscillator. I soon found I had placed C76 on a wrong tag. When I powered up again the oscillator started pumping around once a second. I finally found that R82 was open circuit.

With this replaced I had a healthy line whistle but the boost voltage was low (around 300v) and the EY51 heater was not lit. I knew I had replaced the boost cap so I tried a new boost diode. Still the same so I tried a new line output valve, bingo! I now had a boost voltage of around 415v and a bright raster.

I had a slight fold over at the top of the frame. This was cured by replacing C90. Someone in the past had put a 1meg resistor across R89, perhaps to get more height out of a failing frame output valve.

Someone also had disconnected R40 (12k) which is across S21 on the first vision IF transformer, would this have been done to try and increase gain?

A little bit of tidying up to do but I'm very happy with this set.

Cheers,
John Joe.

Peter.N. · 23rd Mar 2017, 9:21 am

Good job done, brilliant tube, almost as if I was there.

Peter

Heatercathodeshort · 23rd Mar 2017, 5:57 pm

Great receivers Philips. They always perform very well and I can't remember one that caused me grief. That will be a very reliable TV. John.

jayceebee · 23rd Mar 2017, 7:12 pm

That looks very good, I hope my set turns out as good as that when I eventually get cracking with it. Mine too suffered some bodgery in the frame stage which needs to be sorted.

John.

linescan87 · 23rd Mar 2017, 11:14 pm

Thanks lads,

Had it on all last evening, really pleased with this one.

Cheers,
John Joe.

21st Sep 2016, 12:09 am	#1
linescan87 Heptode Join Date: Mar 2014 Location: Meath, Ireland Posts: 551	Philips 1756U About to embark on the restoration of one off these sets. Anyone got one? Obviously all the black caps will have to go. Looks a good set looking at the circuit.

21st Sep 2016, 10:06 am	#2
FERNSEH Dekatron Join Date: Mar 2005 Location: Gateshead, Tyne and Wear, UK. Posts: 7,444	Re: Philips 1756u Some time ago I received an enquiry from a customer about restoring a Philips 1757U which is the console version of the 1756U. It's most likely that almost those black tar goudron capacitors will need replacing. Comprehensive service data for this set can be found in the 1956/57 Radio and Television servicing book. The 1756U is a high performance receiver designed for use in fringe areas. The vision IF amplifier has three EF80 stages. A proper sync cancelled vision AGC system and flywheel line synchronising. DFWB.

21st Sep 2016, 1:12 pm	#3
Peter.N. Dekatron Join Date: Jul 2008 Location: Charmouth, Dorset, UK. Posts: 3,601	Re: Philips 1756u I had a few of these out on rent in the '60s and they proved to be very reliable sets. Don't remember much about them now apart from the pitch capacitors but they were common to most Philips stuff of the time. Hope the restoration goes well. Peter

21st Sep 2016, 8:13 pm	#4
jayceebee Heptode Join Date: Jun 2007 Location: Durham, County Durham, UK. Posts: 640	Re: Philips 1756u This was a set our family had when I was a child, I obtained one just over a year ago after searching for a very long time. I haven't done a lot with it due pressures of work (I was working in and around Dublin last week during the bus strike). My grandparents and two other relatives also owned them but each had very slight differences in cabinet presentation. I'd be interested to see yours. After replacing the only the mains filter capacitor I managed to get a picture and sound but the set has a frame fault. One thing to watch out for is the dreaded partial short on the CRT heater, the gun assembly used in the MW43-64 and other Mullard CRTs of this era were very prone to this. Although mine is afflicted as I only read 4v the emission appears to be good. You can see here how far I got with it. It's in a warm dry place just waiting for further work. I'm looking forward to see how you progress, faster than me probably. John.

18th Oct 2016, 10:52 pm	#5
linescan87 Heptode Join Date: Mar 2014 Location: Meath, Ireland Posts: 551	Re: Philips 1756U Good evening all, Got the chassis out this evening. Hope to make a start soon. Fernseh thankfully I Have the 56/57 Red book. Jayceebee mine looks to have been kept warm and dry for its life. I bought it off the granddaughter of late a Philips employee. I reckon it should be fairly straightforward hopefully. Regards, John Joe. Attached Thumbnails

11th Nov 2016, 6:54 pm	#6
Tazman1966 Nonode Join Date: May 2006 Location: St Albans, Herts, UK. Posts: 2,193	Re: Philips 1756U Any joy with this old Philips yet? __________________ All the very best, Tas

11th Nov 2016, 8:04 pm	#7
linescan87 Heptode Join Date: Mar 2014 Location: Meath, Ireland Posts: 551	Re: Philips 1756U Hi Tas, Still a work in progress. I'm half way through re-capping it. Got a new EHT rectifier valve (EY51) for it as one of heater wires had broken off just under glass lip. The caps are all very leaky indeed. Cheers, John Joe.

12th Nov 2016, 12:59 pm	#8
Heatercathodeshort Dekatron Join Date: Jun 2005 Location: Warnham, West Sussex. 10 miles south of DORKING. Posts: 9,147	Re: Philips 1756U Not sure of the model number of this one. It came by way of a customer in 1975. It worked quite well back then but has not been touched since. It came from Southfields London SW18 so it is probably the non fringe 1446U type chassis. Should be easy to get going. The LOPT is 100% reliable.It appears to have a replacement Mullard MW43-69 tube so there is hope. I'll put it back on the 'to do' pile.. Regards, John. Attached Thumbnails

13th Nov 2016, 12:13 am	#9
AidanLunn Heptode Join Date: Jan 2010 Location: Killamarsh, Sheffield, South Yorkshire, UK. Posts: 746	Re: Philips 1756U HKS, that's a Philips 1747U, IIRC. I remember seeing one of these in a local BHF charity shop, but was only for sale through their eBay account. I missed the end of the auction and consequently the set There is one on Gumtree in Bristol, that I linked to in the "where to get sets" section.

14th Nov 2016, 1:37 pm	#10
linescan87 Heptode Join Date: Mar 2014 Location: Meath, Ireland Posts: 551	Re: Philips 1756U Hi John, Thats a nice looking set, hopefully it won't have to wait too long! Am I right in thinking the first two digits of the model number refere to the tube size? Cheers, John Joe.

26th Dec 2016, 7:41 pm	#11
linescan87 Heptode Join Date: Mar 2014 Location: Meath, Ireland Posts: 551	Re: Philips 1756U Hi all, Hope everyone is having a good Christmas. Sadly life got in the way of this one (jury duty for starters). Hopefully will crack on in the new year. Regards, John Joe.

22nd Mar 2017, 3:04 pm	#12
linescan87 Heptode Join Date: Mar 2014 Location: Meath, Ireland Posts: 551	Re: Philips 1756U Hi All, I finally got back around to this set. Having replaced most of the caps I put the chassis back in the cabinet. When I powered up I had no line drive. I disconnected the screen grid resistor from the line output valve and began too check around the line oscillator. I soon found I had placed C76 on a wrong tag. When I powered up again the oscillator started pumping around once a second. I finally found that R82 was open circuit. With this replaced I had a healthy line whistle but the boost voltage was low (around 300v) and the EY51 heater was not lit. I knew I had replaced the boost cap so I tried a new boost diode. Still the same so I tried a new line output valve, bingo! I now had a boost voltage of around 415v and a bright raster. I had a slight fold over at the top of the frame. This was cured by replacing C90. Someone in the past had put a 1meg resistor across R89, perhaps to get more height out of a failing frame output valve. Someone also had disconnected R40 (12k) which is across S21 on the first vision IF transformer, would this have been done to try and increase gain? A little bit of tidying up to do but I'm very happy with this set. Cheers, John Joe. Attached Thumbnails

23rd Mar 2017, 9:21 am	#13
Peter.N. Dekatron Join Date: Jul 2008 Location: Charmouth, Dorset, UK. Posts: 3,601	Re: Philips 1756U Good job done, brilliant tube, almost as if I was there. Peter

23rd Mar 2017, 5:57 pm	#14
Heatercathodeshort Dekatron Join Date: Jun 2005 Location: Warnham, West Sussex. 10 miles south of DORKING. Posts: 9,147	Re: Philips 1756U Great receivers Philips. They always perform very well and I can't remember one that caused me grief. That will be a very reliable TV. John.

23rd Mar 2017, 7:12 pm	#15
jayceebee Heptode Join Date: Jun 2007 Location: Durham, County Durham, UK. Posts: 640	Re: Philips 1756U That looks very good, I hope my set turns out as good as that when I eventually get cracking with it. Mine too suffered some bodgery in the frame stage which needs to be sorted. John.

23rd Mar 2017, 11:14 pm	#16
linescan87 Heptode Join Date: Mar 2014 Location: Meath, Ireland Posts: 551	Re: Philips 1756U Thanks lads, Had it on all last evening, really pleased with this one. Cheers, John Joe.