This set was purchased from the nvcf with the intentions of using it for spare part to keep my pye sets going but on a closer look it seemed to be something a bit different having a 3 position system switch .The set uses the common PYE 368chassis
VHF405 , VHF625 and UHF625 this intrigued me as to why maybe for the Irish market or just for the ease of using the set on the communal system sometimes fitted I some flats
the set looks quite good from the outside but a bit of a mess inside
The crt is a 19 inch regun but tests out 100% so that’s encouraging
the chassis however is a different story components missing , mains dropper bridged & the smoother being replaced withe the wrong one
most of the electrolytic caps have seen better days with corrosion or leakage on them & most read o/c or leaking anyway
the I/f unit looks as if it’s been twiddled with as some of the cores are in the wrong position compared with a working set
the lopt was tried in a working set & found to be duff luckily I have one although it’s a pattern part it should do the job . The lopt used in these sets is the same as the Philips 210/300 type I suppose the Philips 170 lopt would work too .
so things are not looking too hopeful
so here we go the lopt was replaced as was all the electrolytic caps including the smoother
the mains dropper was replaced with a salvaged one from a scrap chassis
the missing components c118 .1uf boost capacitor & r148 vdr was fitted then came the time to test it , all valves alight hiss from the speaker but no raster nothing , no eht very little at the pl 504 top cap , the line drive was present but low it was found that 2 resistors from the lopt namely r155 & r156 both 3.9 meg had gone o/c replacing them gave me a raster
the system switch was sparking well so that was removed cleaned & refitted as was the one on the I/f strip too .The set now worked quite well apart from the I/f needed realignment
this wasn’t as bad as I thought it was going to be , I cheated a bit here I just copied the position of the cores in my working unit then it was just a matter of fine adjustment
just when you think you cracked it the frame sync decided to give up this was traced to D18in the interlace filter .
i have now been rewarded with a set that looks like this
it was a good job I didn’t use the set for parts the only good bit was the crt ?
I had forgotten this was named the 368 chassis, never seen one with separate tuners, the ones I saw used the integrated VHF/UHF tuner with the IF strip fitted to the side of the main chassis like this one.
Apart from some mechanical problems with the integrated tuner I found these a reliable set unlike the earlier chassis with the IF strip bolted onto the back of the tuner.
It’s as good as it was when new.
Good work Chris and an excellent result ? . I can remember a housing estate in Seaham having a VHF 625 piped system. Seaham was, and still is in some parts difficult for UHF. When the local UHF relay station was built the company maintaining the piped system decided to pull the plug, we had lots of angry customers with unconverted Bush TV125/Murphy V849s without UHF tuners who lost BBC2 and couldn't understand why.
Hi Frank , I haven’t seen one with separate tuners either that’s another reason I found it curious
i have several sets with the integrated tuners & the same 368 chassis like this invicta
Hi John , Thanks for those kind words
I wasn't aware they used the piped system in seaham but then I wasn’t in the trade by the time I move up to co,Durham
i might be calling on your expertise soon as I have a Thorn 3500 coming on the bench soon . I haven’t seen one for 30 years or more to work on so that could bring some challenges
A 2715, very nice. Looking forward to seeing how you get on with it.
The Invicta looks it it uses the 6 position integrated tuner, with the infamous quadrant and gear wheel that stripped then the customer would break the knob trying to turn the jammed mechanism.
Hopefully it has the modified wider die cast quadrant, I used to keep the parts on the van, a quick and easy repair.