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Granada Television Brochure, 1970s
Long Gone UK TV Shops
Memories of a Derwent Field Service Engineer
PYE Australia Circa 1971
Radios-TV VRAT
Fabulous Fablon
Thorn TX10 Chassis
Crusty-TV Museum, Analogue TV Network
Philips N1500 Warning!
Rumbelows
Thorn EMI Advertising
Thorn’s Guide to Servicing a VCR
Ferguson 3V24 De-Robed
Want to tell us a story?
Video Circuits V15 – Tripler Tester
Thorn Chassis Guide
Remove Teletext Lines & VCR Problems
Ceefax (Teletext)
Suggestions
Website Refresh
Colour TV Brochures
1970s Lounge Recreation
CrustyTV Vintage Television Museum
Linda Lovelace Experience
Humbars on a Sony KV2702
1972 Ultra 6713
D|E|R Service “The Best”
The one that got away
Technical information
The Line Output Stage
The map
Tales of a newly qualified young engineer.
Tales of a Radio Rentals Van Boy
Sanyo SMD
Disastrous Company Rebranding
1969 Philips G22K511
Memories Of The TV Trade
Crazy house
Dirty TV screens
Dual Standard and Single Standard CTV’s
Radios-TV on YouTube
The Winter of 62/63
A domestic audio installation
1979 Ferguson Videostar Deluxe 3V16
Music centre modifications
Unusual record player modification
B&K 467 Adapters
Mishaps In The Trade
1971 Beovision 3200
1971 Bush CTV1120
Quick TV cabinet refurbishment 60s style.
Imagine what it was like working in the TV rental trade fifty years ago. You've got to prepare a certain set for re-rental, and fast! Here's an example, this Defiant TV is ready to go but the cabinet needs some work to make it a more viable rental proposition. Sets that were over three years old could be rented out without accepting an advance payment of thirteen weeks.
Let's see how fast I can tidy up this set.
Till Eulenspiegel.
Hi Till,
Wow, that is a real smartner on this set, and what a handsome set too.. Not over cluttered with buttons and knobs, functional but at the same reservedly smart and attractive. I'll bet it's a real Plessey to work on.
Now, I just have to say, I like it!
Marion
Hi Marion,
The cabinet top just needs "spiriting off" and then it's ready for delivery tomorrow. So far I've resisted the "just plug it in" routine.
This set has a 90 degree CRT, a Mazda CRM173, magnetic focus. The Rediffusion version, the CA174B has the Mullard AW43-80 electrostatic focus CRT.
Till Eulenspiegel.
Hi Till,
I have a variac......
I have to say though, it really is a smart looking set, and my guess would be that it's the same chassis as my table top Defiant 17" model.. Mine needs a look at to find the cause of its picture shrinkage, but otherwise, it worked from first light with excellent geometry and focus.. Picture quality was aboslutely spot on with first rate brightness & contrast, and perfect lock on both timebases.
I think Plessey made a first class job of this chassis, and I'd guess that it was the ideal candidate for rental sets.
Marion
Hi Marion, Servicing data for this set can be found in the 1958/59 R & T servicing book, on pages 344,345 and 346. Model 7109.
Till Eulenspiegel.
Hi Till,
Looking at as I type.
Marion
Another Defiant TV set which employs a similar chassis as the console 7109. This is an early version of the Plessey chassis. Made in 1956 this set, model 1410X employs a 14" Mazda CRT type CRM143, a rather curious tube as does not have a aquadag coating and for that reason a separate EHT smoothing capacitor is required. A later CRT, the CRM144 has the aquadag. Note the very early version of the PY32 HT rectifier, it has the ST shape bulb. Later PY32s have a tubular bulb. the PY32 was replaced by the PY33 which has a special cathode coating which offers a lower A-K voltage drop.
The upper rear batten needs replacing. Sort of split in two. I'll make a new one.
Till Eulenspiegel.
One here too https://www.radios-tv.co.uk/pivotx/?p=19 ... fiant-7109
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Hi Chris, Your 7109 is the later version and has the excellent electrostatic focus Mazda CME1702 CRT which replaces the CRM173 employed in the set which is the subject of this topic.
The final model in this series, the 719 used a PCL84 as the video amplifier.
Till Eulenspiegel.
The Defiant TV set was delivered yesterday. We've learnt something else about this set, it has FM radio. The turret tuner has three positions for BBC Home, Light and Third.
The circuit for this set resembles that of the Regentone T21FM and information about that set can be found in the 1958/58 Newnes Radio and Television book. The only difference between the Regentone version is choice of valves, Mullard instead of Mazda.
Till Eulenspiegel.
Nice job on the cabinet Till, did you resist the urge to plug it in?
30s radio and round tube tv fan collector of lost causes and poor old things that need some tlc.
Hi Till,
This is a really nice set.. Many thanks indeed.
I haven't really looked in at any depth, but I had a good peep before I put the back, back on, and I'm impressed with the build quality of the cabinet, which is excellent.
The chassis has a lovely layer of dust which reveals nice clean metalwork beneath.. It shows no sign of previous repairs (as yet anyway), but I am itching to replace that particular cap you referred to lastnight, and see what happens.
I'll probably kick off with repairing the channel knob, even if just to simplify the task of knowing which channel we're on!
Now, for everyone else' benefit... We just had to give it the beans, didn't we?
So, we took a hybrid approach to this... Not my own usual reserved slow wake up, but then not full on power approach neither.
In our eagerness to see first light, "we" skipped the snipping out of the filter cap , and brought up the volts on the variac over about ten or fifteen minutes (well, Marc and Till did!) until there were signs of life.. I have to confess, I couldn't really hear the line whistle (tinnitus and all that), but there was a healthy flame of EHT from the rectifier top-cap.. A minute or so of Till adjusting the ion trap, and voila! we had a raster - First light.
Next job was to bring on the Aurora, and find a channel, and there we had it, a bit distorted (frame linearity) but bright and healthy testcard. More on the electronics later
Prior to this, we had a little French polishing lesson - courtesy of one of my cats! and that is an artform in its own right.. I know Marc has done this kind of work before, and watching Till at work on the cabinet was quite absorbing and interesting, just to see that shine reappear from the polish (naughty puddy-tat, put paw marks all over it) with nothing more than methylated spirits and linseed oil, Till recovered the shine.
In the fulness of time, I will begin a thread on this set, and will see how well I can restore the electronics, though it shouldn't be difficult.
Marion
Nice job on the cabinet Till, did you resist the urge to plug it in?
Hi Mike,
We did this one properly, used the variac and brought up the supply voltage slowly.
The picture is compressed at the top and this fault will almost certainly be due to a leak in C41, (C37 in the Regentone version). See attached circuit diagrams. A leak in this capacitor will cause the negative voltage present in the blocking oscillator appearing at the control grid of the output pentode.
Worth noting that the Regentone has two frame linearity controls, it should be possible to modify the Defiant to this spec. Perhaps the designer wished to optimise the frame linearity on the 21" CRT receiver.
This was one of the most reliable 1950s TV chassis, although I'd reckon the RGD Deep 17" was even more reliable.
Till Eulenspiegel.
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