Tandberg CTV 1 - UK Vintage Radio Repair and Restoration Discussion Forum

hans · 25th Jun 2016, 10:09 am

I just got an old Tandberg. According to the people I got it from it was used to about year 2000. When I was in the trade (early 90's) I only saw two or three of these. At the time I didn't like them.

This set was working when it was used last. I had a brief look into the set. It looked dusty, but everything was original and there was no signs of heavy use.

I plugged it in and was awarded with sound, and after about a minute the picture was there. It filled the whole screen. But then the smoke came. There was a lot of it. It smelled burned paper. I guess it was a RIFA, but I couldn't see the damage. I have to do a closer inspection to find the culprit.

I have had a look on the net for the diagram for this set, but none of the usual places has it. Does anyone on the forum have it?

Welsh Anorak · 25th Jun 2016, 10:19 am

That's the one with a spring-loaded resistor by the LOP stage that deliberately hits the metal frame and blows the fuse when it opens if I rememeber rightly.
It sounds a nice project. I only saw a couple of these - they were imported in the early Seventies, but there were nowhere near as many as the CTV2.
Television magazine did an article on them in the late Seventies but I don't have the date unfortunately, though I'm sure an archivist here will be able to find and scan it for you.
Glyn

hans · 25th Jun 2016, 10:53 am

We didn't have colour broadcast here when these were made. They didn't sell many of these here. I guess you had to be very interested in TV to fork out all the money for a set like this when most of what you cold use it for was B/W. The CTV2-4 was made in the UK.

KeithsTV · 27th Jun 2016, 7:46 pm

Here's the Television article July 1977 issue. Covers the Line and Field timebases and the PSU.

Keith

dazzlevision · 27th Jun 2016, 7:59 pm

Hello,

Interesting set, using 3 x PL802 pentode valves for the RGB drive to the CRT.

I had one in the past but moved it on all in order to concentrate on UK made TVs.

Regards,

Dazzle vision

Anthony Thomas · 27th Jun 2016, 11:31 pm

Quote:

Originally Posted by hans

I have had a look on the net for the diagram for this set, but none of the usual places has it. Does anyone on the forum have it?

Didn't Norsk Radiohistorisk Forening have the schematic Hans?

Welsh Anorak · 28th Jun 2016, 3:10 pm

I couldn't remember which set used the three PL802s - I'd thought it was a Skantic or Luxor but found out I was wrong. Thanks for the information!
Glyn

MALC SCOTT · 28th Jun 2016, 3:28 pm

Luxor used 3 x EF184,Malc.

brunel · 28th Jun 2016, 3:53 pm

As to be expected, watch out for heat damage on the printed circuit from the PL802's.

When it became difficult to obtain the PL802, a solid state version was produced.

Also the line osc. ECH84 was prone to o/c heaters, caused by flashover in the PY500.

hans · 28th Jun 2016, 6:40 pm

Quote:

Originally Posted by KeithsTV

Here's the Television article July 1977 issue. Covers the Line and Field timebases and the PSU.

Thanks!

Much info there that'll come in handy.

Quote:

Originally Posted by Anthony Thomas

Didn't Norsk Radiohistorisk Forening have the schematic Hans?

They don't have for colour. I could only find for mono sets.

hans · 28th Jun 2016, 7:10 pm

I had a good look at the set again. All the smoke had to come from somewhere. I had a look at the Rifas in the "power supply", but the all looked unburned. All of them have a few small cracks. Not deep and wide cracks like in my Tandberg TV1 which is ten years older and have lived 10+ years in a damp garage. All the other components looked well too.

I then wanted to try a more efficient method: I plugged the set and turned it on keeping a finger on the power switch for fast depowerment. This time there was no smoke....

The next step will be to find a signal source. I would like to see if this old tube will give a good picture.

Quote:

Originally Posted by brunel

As to be expected, watch out for heat damage on the printed circuit from the PL802's.

When it became difficult to obtain the PL802, a solid state version was produced.

Also the line osc. ECH84 was prone to o/c heaters, caused by flashover in the PY500.

I allways had trouble with burned print on the hybrids. I didn't do many of them as there werent many of them around by the time I started with tvs in the late 80's, and I avoided them as they had lower walue than newer sets and were harder to repair. The ones I did weren't wery reliable.

This set has no heat damage that I can find. Some resoldering has been done one the valve bases. I have to do some resoldering on other places, but this set looks little used.

20+ years ago I scrapped a CTV 1. That set had the solid state PL802s. I have them somewhere.

volte-face · 29th Jun 2016, 10:29 am

PM sent regarding service manual.

25th Jun 2016, 10:09 am	#1
hans Heptode Join Date: Jan 2008 Location: Oslo, Norway. Posts: 632	Tandberg CTV 1 I just got an old Tandberg. According to the people I got it from it was used to about year 2000. When I was in the trade (early 90's) I only saw two or three of these. At the time I didn't like them. This set was working when it was used last. I had a brief look into the set. It looked dusty, but everything was original and there was no signs of heavy use. I plugged it in and was awarded with sound, and after about a minute the picture was there. It filled the whole screen. But then the smoke came. There was a lot of it. It smelled burned paper. I guess it was a RIFA, but I couldn't see the damage. I have to do a closer inspection to find the culprit. I have had a look on the net for the diagram for this set, but none of the usual places has it. Does anyone on the forum have it?

25th Jun 2016, 10:19 am	#2
Welsh Anorak Dekatron Join Date: Apr 2005 Location: North Wales, UK. Posts: 6,925	Re: Tandberg CTV 1 That's the one with a spring-loaded resistor by the LOP stage that deliberately hits the metal frame and blows the fuse when it opens if I rememeber rightly. It sounds a nice project. I only saw a couple of these - they were imported in the early Seventies, but there were nowhere near as many as the CTV2. Television magazine did an article on them in the late Seventies but I don't have the date unfortunately, though I'm sure an archivist here will be able to find and scan it for you. Glyn

25th Jun 2016, 10:53 am	#3
hans Heptode Join Date: Jan 2008 Location: Oslo, Norway. Posts: 632	Re: Tandberg CTV 1 We didn't have colour broadcast here when these were made. They didn't sell many of these here. I guess you had to be very interested in TV to fork out all the money for a set like this when most of what you cold use it for was B/W. The CTV2-4 was made in the UK.

27th Jun 2016, 7:59 pm	#5
dazzlevision Dekatron Join Date: Sep 2003 Location: Near Swindon, North Wiltshire, UK. Posts: 3,621	Re: Tandberg CTV 1 Hello, Interesting set, using 3 x PL802 pentode valves for the RGB drive to the CRT. I had one in the past but moved it on all in order to concentrate on UK made TVs. Regards, Dazzle vision

28th Jun 2016, 3:10 pm	#7
Welsh Anorak Dekatron Join Date: Apr 2005 Location: North Wales, UK. Posts: 6,925	Re: Tandberg CTV 1 I couldn't remember which set used the three PL802s - I'd thought it was a Skantic or Luxor but found out I was wrong. Thanks for the information! Glyn

28th Jun 2016, 3:28 pm	#8
MALC SCOTT Octode Join Date: Aug 2006 Location: Willington, County Durham, UK. Posts: 1,499	Re: Tandberg CTV 1 Luxor used 3 x EF184,Malc. __________________ Malc Scott

28th Jun 2016, 3:53 pm	#9
brunel Heptode Join Date: Sep 2005 Location: LEEDS.......North of the River Aire. Posts: 872	Re: Tandberg CTV 1 As to be expected, watch out for heat damage on the printed circuit from the PL802's. When it became difficult to obtain the PL802, a solid state version was produced. Also the line osc. ECH84 was prone to o/c heaters, caused by flashover in the PY500.

29th Jun 2016, 10:29 am	#12
volte-face No Longer a Member Join Date: Oct 2015 Location: Middlesex, UK. Posts: 198	Re: Tandberg CTV 1 PM sent regarding service manual.