Thought it was time I got around to posting something on here as it’s been a while, so Chris (crustytv) was telling me 😬
Well this is a lovely Tandburg TV1 hybrid in a rosewood cabinet, it had been in Chris’s collection for some years and was collected from Ipswich many years ago. The set came to me about 2 weeks ago and the set was in as found condition, now never had anything to do with these sets when I was in the trade so it was going to be a challenge.
On first inspection everything was there and the crt tested excellent so that was a good place to start from the set is a hybrid using only 6 valves , the usual PL509 and PY 500A in the line output stage, but that’s where the familiarity stops the line oscillator is a ECH84 and the RGB drives for the output is 3x PL802’s, and its grid modulated instead of the usual cathode modulation the set was full of those horrible Rifa capacitors all of which were cracked so they got changed on sight.
Power was applied via a variac it was left to cook at 50 volts for a while to give the electrolytics a chance, but all was not good the main smoothers were hot to touch now these are 200uf @ 350v in the same can and are wired in parallel giving 400uf and there are 2 of these, they were replaced with 400uf 450volt modern capacitors.
After carefully powering up over a long period I finally had something on the screen frame collapse and no sound, then the hissing started with other capacitors objecting to having been woken up from their slumber. I then decided a total recap of electrolytics was in order this took a few days as there are loads in these sets and on testing each one as they came out it was a good move to make replacing them all some totally o/c others way out of spec. Still had frame collapse this turned out to be the BR101 with 3 of its 4 legs rusted off, a replacement restored the frame and I had a reasonable mono picture but no colour and still no sound.
The no sound was my fault I forgot to mention the volume control was totally solid and took w while either the old wd40 to free it up but on doing, so I damaged the print on one leg to the volume control a wire bridge sorted that out. Now the other fault that shows itself was a strange frame fault with the top of the scan being expanded with flyback lines and really unusual in its appearance after many hours head scratching and checking almost all the components in the frame circuit the culprit was a 6.8k resistor that supplies the -18 volts to the fly back circuit coupled to the frame transformer via a .1 uf capacitor this had gone high to 5meg, and it restored normal working frame with no flyback lines.
The no colour was traced to Q751 on the decoder being O/C I then had colour with no blue that turned out to be another O/C transistor Q753. The last item to be replaced was the frame shift control, as this was solid! A new old stock 1k wire wound convergence type pot was fitted.
I now have a lovely working example of this unusual set.
Thought it was time I got around to posting something on here as it’s been a while, so Chris (crustytv) was telling me
That's right, you slacker 😉 🤣
Still, you've redeemed yourself with a great thread, and an equally excellent account of bringing this lovely early example of the Tandberg range, back to working order. Boy, that needed a fair amount of caps too, wise move going with the gentle variac start those big smoothers would have made a mess of the workshop and your pants had they, and you let go.
Five years ago, this was saved from the barn, about time it was given life. I still have one final Tandberg in the collection, as you know that one tripped my bench isolation, workshop RCD and house RCD, serious short somewhere.
CrustyTV Television Shop: Take a virtual tour
Crusty's TV/VCR Collection: View my collection
@the_teleman An interesting read! That must be a very uncommon set today. We had a local Tandberg dealer so I saw a few in for repair. Mostly when they were getting on a bit. I saw the occasional CTV1 but they were mainly CTV2s and 3s. Capable of excellent results even when old. ISTR the tube in the CTV2 could get a bit "woolie" as could the power supply! 🤯
I forgot they used three PL802s it would have been easy to convert to solid state output!
@cathovisor It was! They must have sold a fair number over the years. When Tandberg finished they took the B&O franchise. I still have an ex-Cottons B&O, it is a mint low hours and is now my bedroom set. 😎
Someone I used to know bought a B&O TV from Cotton's, in addition to several Grundig Satellits from Robertson's. My Panasonic Prism came from Cotton's too, along with the posh cabinet/stand.
Always interesting to read about hybrid CTVs, we missed out on them in Oz.
Thank you!
In IMG3881, do I detect a shorted Hor S correction cap?
