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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
[Closed] GEC valve radio BC5839 volume fades after a while
This is a lovely radio and works almost perfectly except after a while the volume suddenly drops low. Can anyone help me please? Also what does X79 valve do?
Hello there and welcome to the forum.
The X79 is a frequency changer and is used at the front end of the radio.
http://www.r-type.org/exhib/aaq0065.htm
As for the fault, you maybe could try to narrow it down a little as to what area of the set it lies. For example, you could feed in an external audio source into the Gram input to check the audio stages of the set. A CD player could be used for example. If all is well, then the fault is further back.
Has the radio ever been serviced recently? For example have any defective capacitors been replaced? If not, it could be an electrically leaky capacitor (or several) reducing the gain of the set. It could also be a faulty valve, the X79 a possibility. The fault may even lie outside of the radio if the aerial is defective in some way, like a loose connection.
The list of possibilities can be quite long.... a case of elimination one by one is needed.
To understand the black art of electronics is to understand witchcraft. Andrew.
Hi and welcome to the forum. ?
I suspect from your query you might be a keen novice? Apologies if I'm way off.
Can we therefore establish if the above is true or false, and ask the following:-
- What is your experience with vintage valve circuits?
- Do you have a circuit diagram and can you understand one?
- Do you have a multimeter and know how to take readings with regard to resistance and voltage checks?
Knowing all the above will help members correctly pitch their assistance, to match your level of experience. This information will also help folk keep you safe if you are indeed a novice. Without knowing any of this there's a possibility of blinding you with science if you are new, a risk of putting you in danger if you're not aware of the voltages involved. Also, If you are experienced giving you an unnecessary egg sucking exercise.
If you are new to this great hobby you might find this useful reading: https://www.radios-tv.co.uk/basic-radio-repair/
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Thread closed
OP registered almost 4 weeks ago, posted his query and has not logged in since. Questions asked by OP received responses, but they have made zero follow up. It can always be opened again should the OP turn up.
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