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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
PYE 11 u chassis
This is a question that's bugged me for years , on the PYE 11U series VHF tuner there are 2 symbols a square & a triangle
Can anyone explane the purpose of these ?
Cheers
Chris
Hi Chris,
I think they are just to represent spare channels....on mine, there are no biscuits fitted in the tuner at those positions.
To understand the black art of electronics is to understand witchcraft. Andrew.
Can you post that part of the circuit? The ones in the library does not show those symbols, or to be more correct I don't see them.
Frank
Apart from the occasional valve replacement and contact clean the VHF tuners gave me little trouble. The Philips rotary tuner fitted to some Ferranti sets had a mechanical problem in that the plastic fine tuning rod occasionally broke off. Fiddly but possibly to change in the house.
Looking at the two VHF tuner circuits in the circuit from the library I had never noticed that the UHF IF signal on one tuner uses both valves and on the other just the Pentode sectional if I had noticed it was long forgotten until just now
Frank
Can you post that part of the circuit? The ones in the library does not show those symbols, or to be more correct I don't see them.
The symbols are shown on the VHF channel selector knob. I'm nowhere near mine at the moment otherwise I'd post a picture to show. I assume they were for 'special' channels...cable perhaps? Maybe in flats that had cable distribution systems, special biscuits were available for the VHF tuner.
"edit". You can see the symbols in this old post of mine. You'll need to click on the picture to enlarge it.
?? four years ago?? The set looks and works much better than that now!
I don't remember, seems a lot I don't.
The cable suggestion is a good possibility, the only other possibilities I can think of is the there are only 11 positions for VHF and there were 13 possibilities. They may have done that to fit biscuits for the channels not marked on the knob i.e 12 and 13, I can't make out what other channels are missing, there must be two others.
The other is for none standard channel pairing, i.e, normally 2 and 9 or 1and 9, 4 and 8, etc, the biscuits for the non standard channels could be put together. 2 and 10 for Yorkshire don't seem to be paired.
Both ideas are guesses however.
Frank
Frank
That Pye tuner is a bit odd, having only 12 positions, including UHF!
Possibly Frank is right and these are dual purpose markings which could be used for missing channels on either standard.
I can't remember how the system switching is achieved on the 11U but I do remember the method adopted by Baird - which did, I believe, have the full 14 positions - and is probably similar to the Pye arrangement.
Baird had a pin on the end of the system switch operating lever which engaged in a slot on a metal wheel mounted on the rear of the turret spindle. The standard wheel moved to the 625-line position only for UHF but an optional wheel was available which increased the number of 625-line positions to four IIRC with the new positions occupying a similar position to the symbols on the Pye.
We used these for customers in council tower blocks which had VHF only distribution systems and translated BBC2 to a VHF channel - in our case, this was Channel C (61.75MHz Vision, 67.75MHz Sound) with 405-line signals on their off-air allocations of Channels 1 and 9.
When all else fails, read the instructions
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