1983 Philips 26CS3890/05R Teletext & Printer
MRG Systems ATP600 Databridge
Teletext Editing Terminal
Microvitec Monitor 1451MS4
BBC Microcomputer TELETEXT Project
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1976/77 Rank Arena AC6333 – Worlds First Teletext Receiver
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Ceefax (Teletext) Turns 50
Philips 1980s KT3 – K30 Range Brochure
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Ferguson Videostar Review
She soon put that down
1983 Sanyo Brochure
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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
Suggestions
Website Refresh
Colour TV Brochures
1970s Lounge Recreation
CrustyTV Vintage Television Museum
Linda Lovelace Experience
Humbars on a Sony KV2702
1972 Ultra 6713
1983 Philips 26CS3890/05R Teletext & Printer
MRG Systems ATP600 Databridge
Teletext Editing Terminal
Microvitec Monitor 1451MS4
BBC Microcomputer TELETEXT Project
Viewdata, Prestel, Philips
Philips Model Identification
1976/77 Rank Arena AC6333 – Worlds First Teletext Receiver
PYE 1980s Brochure
Ceefax (Teletext) Turns 50
Philips 1980s KT3 – K30 Range Brochure
Zanussi Television Brochure 1982
Ferguson Videostar Review
She soon put that down
1983 Sanyo Brochure
Wireless World Teletext Decoder
Unitra Brochure
Rediffusion CITAC (MK4A)
Thorn TRUMPS 2
Grundig Brochure 1984
The Obscure and missing Continental
G11 Television 1978 – 1980
Reditune
Hitachi VIP201P C.E.D Player
Thorn 3D01 – VHD VideoDisc Player
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
Suggestions
Website Refresh
Colour TV Brochures
1970s Lounge Recreation
CrustyTV Vintage Television Museum
Linda Lovelace Experience
Humbars on a Sony KV2702
1972 Ultra 6713

The Pye FV1 is now in the workshop. The good news is the set is restorable. The cabinet will need attention, the original lacquer is in poor condition and will be stripped off. Particular care will be taken to preserve the Pye emblem on the cabinet top.
The underside of the chassis is in surprisingly good condition. No evidence of any servicing work has been carried out during the life of the receiver. All the valves are the originals, no replacements fitted. Judging by the type of EF80 pentodes I'd guess the set was made in 1952.
Till Eulenspiegel.

It certainly looks nice and clean under the chassis. What is the top of the chassis like?
Nice and safe from the upcycle brigade now!

Posted by: @tillNo evidence of any servicing work has been carried out during the life of the receiver. All the valves are the originals, no replacements fitted.
I too looked at that and thought "that's never had a hand upon it". Very impressive - I wonder if it worked reliably enough that when ITV came along it was simply replaced with a newer receiver?
I hate to say this but it almost seems a pity to restore it to working order, such is the originality of the set.

I hate to say this but it almost seems a pity to restore it to working order, such is the originality of the set.
Perhaps if the waxie TCC capacitors are restuffed to retain some semblance of originality. My other FV1 has had very little work done to it throughout the time its been in my possession. Coming up for sixty-three years.
The top side of the chassis isn't so nice but it'll clean up.
Till Eulenspiegel.

Yes, I have seen worse! Those square valve screening cans always seem to be rusty on Pye sets. One thing that did strike me about the underside view of the chassis is how tidy and well laid out it is. Quite unlike the usual Pye 'knitting'! Almost as tidy as a Bush!


The line output transformer is receiving the warming up treatment. The PL38 line output valve was replaced in 1957. Valve has the date code B7G.
Till Eulenspiegel.
This chassis deserves the re-stuffing of the paper caps. Here's how I do it:
Cover a baking tray with cooking paper and put it on the bottom shelf in the oven.
Hang all the waxies by their leads from a rack above the tray.
Cook for about 15 mins at 200 degrees C. or until the sleeves melt off the innards and fall onto the tray. Sometimes they need a little coaxing.
While still warm, wipe the sleeves clean with a rag.
Slide new poly cap (with lengthened leads if necessary) inside the sleeves.
Seal the ends with hotmelt glue.
The finished job looks just like a brand new paper cap!

What about the electrolytics though? Everyone talks about how they do "waxies" (a term I really dislike) but I have seldom seen a satisfactorily-rebuilt electrolytic - in fact I have seen some right horror stories on this very forum.

Posted by: @cathovisorI have seldom seen a satisfactorily-rebuilt electrolytic - in fact I have seen some right horror stories on this very forum
Conversely, there have been some incredible ones too, such as the ones manufactured 10-years ago now, by the pre-war master Brian Cuff.
I also remember in that same thread the unbelievable work and effort he invested into make the missing I.Ft's.
CrustyTV Television Shop: Take a virtual tour
Crusty's TV/VCR Collection: View my collection


As a result of corrosion almost every section of the mains dropper resistors are open circuit. The circuit diagram of the FV1 doesn't have mains dropper resistive values, but the circuit diagrams of the models FV2C and FV4C do. The attachment is the power supply section of the FV4C. The FV2 has the Mullard metal cone CRT type MW41-1 and the FV4C a Mullard MW36-24. Note the bi-filar windings in the heater chain. The booster diode is a Mullard PY80 which doesn't have sufficient heater cathode insulation so the extra windings on the line output transformer compensate for the this. It's possible the PY81 wasn't available when the FV1 was in the design stage.
Till Eulenspiegel.

Posted by: @tillThe booster diode is a Mullard PY80 which doesn't have sufficient heater cathode insulation so the extra windings on the line output transformer compensate for the this. It's possible the PY81 wasn't available when the FV1 was in the design stage.
I believe that was indeed the case, Till - I think there's a Bush set that does this too, IIRC the TUG26.

Hi Mike, I'll take a look at the Bush TUG26 circuit diagram to confirm this. I was told that there was a Bush TV set in which the boost diode derived it's heater supply from a winding on the line output transformer in a similar manner as certain post-war Continental Philips TV receivers. A special diode was made for the purpose, the EA40. EA40 (hupse.eu)
Till Eulenspiegel.

I seem to recall this method is covered in Spreadbury.

Implementation of the bifilar LOPT windings for the PY80 in the Bush TUG26 and TUG34; note, the TUG34A does not do this as it has a PY81.

Radiomuseum states that the PY81 was introduced in 1951. Possibly too late for the Pye FV1 and Bush TUG26. In the event of failure of the bi-filar windings there's nothing to stop replacement of the PY80 with the PY81.
PY 81, Tube PY81; Röhre PY 81 ID3375, Damper, booster, flyba | Radiomuseum
Till Eulenspiegel.

Posted by: @tillIn the event of failure of the bi-filar windings there's nothing to stop replacement of the PY80 with the PY81.
Assuming the failure mode isn't shorted turns in those windings, of course.

Posted by: @cathovisorAssuming the failure mode isn't shorted turns in those windings, of course.
That's right of course. The restoration of this set will take some time and I'm no hurry to finish the job. How about allowing some engineering licence and do one of two modifications to set? For example try out a different sync separator circuit. In the 1960 Practical Television TV receiver the Mazda 6F33 valve was used as a Miller integrator to separate the frame sync pulses. The circuit exploits the G3 characteristics of the Mazda 6F33. The valve was used for all sorts of interesting applications. 6F33, Tube 6F33; Röhre 6F33 ID18697, Vacuum Pentode | Radiomuseum
Till Eulenspiegel.
Mod note:
Fixed broken the quote. When, editing a quote please do not remove the codes (userid & Postid) the forum inserts

Posted by: @tillHow about allowing some engineering licence and do one of two modifications to set?
Your set of course David, but again I would be inclined to say that given its originality perhaps another FV1 could be found to experiment on, rather than this one?
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