1972 Philips G24T324 - UK Vintage Radio Repair and Restoration Discussion Forum

EtiDan2001 · 18th Jun 2020, 10:33 pm

Hi I picked this set up today and thought it was a g20T322 from the posts I have read but on the back it says G24T324. Is there any difference between them and is it rare? It still has the stand which is nice. Cheers

Richard_FM · 18th Jun 2020, 11:08 pm

I saw your pictures on Facebook earlier, these don't seem as a common as the other B&W single standards of the era.

On this link scroll to almost the bottom of the page.

https://www.radios-tv.co.uk/early-19...hrome-philips/

toshiba tony · 19th Jun 2020, 4:48 am

Think it was called the 320 chassis, I only saw a few and faults are vague. I seem to remember their tubes used to get battered and they had a glow switch for protection and it tended to fire randomly, good looking tv though.

Welsh Anorak · 19th Jun 2020, 8:39 am

The difference is only cosmetic - I think the control panel is a slightly different colour. Otherwise it's a solid-state chassis with a thyristor power supply and, as Tony says, a glow switch. Has something in common with the Pye CT200 and G8, but obviously in monochrome. Not the most reliable TV but well worth getting going.

Heatercathodeshort · 19th Jun 2020, 9:57 am

Take care before you plug it in! Examine the 3rd harmonic tuning capacitor connected to the collector of the line output transformer to earth. If it is the green Philips type this must be replaced!
It is a critical component the value of which is also crucial.

This is my G20T328-02. Philips 320 chassis and I didn't follow my own advice.
I gave it a quick check over then plugged it in. Bang! the cap was O/c causing a massive EHT surge that popped the line oscillator chip. That was decades ago!

failure to start with the mains fuse intact is usually due to resistors in the power supply control circuit that have risen in value. Check them all particularly any over 100K in value.

The 320 was a bit of a shock after the 210/300 series but we soon got used to the power supply beast. A really good chassis somewhat spoilt by a cheap nasty power supply. Typical British problem. Good luck with it.
John.

EtiDan2001 · 19th Jun 2020, 11:33 am

Hi yes I did read a similar post regarding the green capacitor near the switch and I obviously haven’t plugged it in yet but I’m looking for a new cap to replace it but it only has these markings nothing else?

Heatercathodeshort · 19th Jun 2020, 12:55 pm

That looks like the one. [Substitute transistor for transformer in my last post!] If you remove the cap you will see it's value. It's hidden at moment.
I've just checked the value C 2461. It is 2N7 [2700pf] 1500v The resistors that will need checking in the PSU are 5633 220K. 5649 820K . The PSU refuses to kick into action if these two are high. If they are the originals they will be.

Watch out for the charged 2X 400uf smoothing can..

AJSmith625 · 19th Jun 2020, 6:41 pm

Just a word of caution, if my memory is correct I am pretty certain this power supply has a bridge rectifier on the mains input. This means the chassis is live at roughly half mains potential when the set is switched on. Best to use a mains isolation transformer while working on it if possible.

Alan.

18th Jun 2020, 10:33 pm	#1
EtiDan2001 Triode Join Date: Apr 2020 Location: Surrey, UK. Posts: 12	1972 Philips G24T324 Hi I picked this set up today and thought it was a g20T322 from the posts I have read but on the back it says G24T324. Is there any difference between them and is it rare? It still has the stand which is nice. Cheers Attached Thumbnails

18th Jun 2020, 11:08 pm	#2
Richard_FM Nonode Join Date: Sep 2017 Location: Stockport, Cheshire, UK. Posts: 2,002	Re: 1972 Philips g24T324 I saw your pictures on Facebook earlier, these don't seem as a common as the other B&W single standards of the era. On this link scroll to almost the bottom of the page. https://www.radios-tv.co.uk/early-19...hrome-philips/ __________________ Hello IT: Have you Tried Turning It Off & On Again?

19th Jun 2020, 4:48 am	#3
toshiba tony Heptode Join Date: May 2006 Location: Accrington, Lancashire, UK. Posts: 978	Re: 1972 Philips G24T324 Think it was called the 320 chassis, I only saw a few and faults are vague. I seem to remember their tubes used to get battered and they had a glow switch for protection and it tended to fire randomly, good looking tv though.

19th Jun 2020, 8:39 am	#4
Welsh Anorak Dekatron Join Date: Apr 2005 Location: North Wales, UK. Posts: 6,918	Re: 1972 Philips G24T324 The difference is only cosmetic - I think the control panel is a slightly different colour. Otherwise it's a solid-state chassis with a thyristor power supply and, as Tony says, a glow switch. Has something in common with the Pye CT200 and G8, but obviously in monochrome. Not the most reliable TV but well worth getting going. __________________ Glyn www.gdelectronics.wales

19th Jun 2020, 9:57 am	#5
Heatercathodeshort Dekatron Join Date: Jun 2005 Location: Warnham, West Sussex. 10 miles south of DORKING. Posts: 9,147	Re: 1972 Philips G24T324 Take care before you plug it in! Examine the 3rd harmonic tuning capacitor connected to the collector of the line output transformer to earth. If it is the green Philips type this must be replaced! It is a critical component the value of which is also crucial. This is my G20T328-02. Philips 320 chassis and I didn't follow my own advice. I gave it a quick check over then plugged it in. Bang! the cap was O/c causing a massive EHT surge that popped the line oscillator chip. That was decades ago! failure to start with the mains fuse intact is usually due to resistors in the power supply control circuit that have risen in value. Check them all particularly any over 100K in value. The 320 was a bit of a shock after the 210/300 series but we soon got used to the power supply beast. A really good chassis somewhat spoilt by a cheap nasty power supply. Typical British problem. Good luck with it. John. Attached Thumbnails

19th Jun 2020, 11:33 am	#6
EtiDan2001 Triode Join Date: Apr 2020 Location: Surrey, UK. Posts: 12	Re: 1972 Philips G24T324 Hi yes I did read a similar post regarding the green capacitor near the switch and I obviously haven’t plugged it in yet but I’m looking for a new cap to replace it but it only has these markings nothing else? Attached Thumbnails

19th Jun 2020, 12:55 pm	#7
Heatercathodeshort Dekatron Join Date: Jun 2005 Location: Warnham, West Sussex. 10 miles south of DORKING. Posts: 9,147	Re: 1972 Philips G24T324 That looks like the one. [Substitute transistor for transformer in my last post!] If you remove the cap you will see it's value. It's hidden at moment. I've just checked the value C 2461. It is 2N7 [2700pf] 1500v The resistors that will need checking in the PSU are 5633 220K. 5649 820K . The PSU refuses to kick into action if these two are high. If they are the originals they will be. Watch out for the charged 2X 400uf smoothing can.. Last edited by Heatercathodeshort; 19th Jun 2020 at 1:06 pm. Reason: Info added.

19th Jun 2020, 6:41 pm	#8
AJSmith625 Pentode Join Date: Nov 2017 Location: Birmingham, West Midlands, UK. Posts: 171	Re: 1972 Philips G24T324 Just a word of caution, if my memory is correct I am pretty certain this power supply has a bridge rectifier on the mains input. This means the chassis is live at roughly half mains potential when the set is switched on. Best to use a mains isolation transformer while working on it if possible. Alan. Last edited by AJSmith625; 19th Jun 2020 at 7:00 pm. Reason: text added.