Bush TR82C.

[pwdrive]

Don't worry worry about the technical jargon, we don't understand it either....
Any questions, just ask, no worries.

Lawrence.

[Yorkie]

Corr....That's a posh one David, mine only had two transistors in it (now long gone)

Lawrence.

I've still got the 2 transistor injector that I made back in the mid 1950s, built into a Woolworth plastic icing syringe! There's a picture of it post No 8 at the the link below, including a scope trace which shows that it still functions as good as ever it did. When I wrote the above post about injector/tracers, I had a distinct feeling of deja vu, and if I'd taken the trouble to trawl through the archives I could have saved my breath as I'd said it all before, back in Nov 2011:

http://golbornevintageradio.co.uk/forum/...p?tid=1504&highlight=Signal+Tracer

Ho hum, another Yorkie 'intellectual interlude' AKA 'senior moment'.

[Joe]

It's even a sticky.

Still, better to say it twice than not at all. Nice to now have the notes in easily downloadable form too.

Let's not forget my first one: http://golbornevintageradio.co.uk/forum/showthread.php?tid=513

On second thoughts, lets!

- Joe

[pwdrive]

The one I built as an apprentice used just the two transistors functioning as both injector and tracer, needless to say the audio quality on the tracer was crap with that simple arrangement. We used to build stuff like that into cigar tubes or the old PU cartridge containers, I think they were Acos cartridge containers?

Lawrence.

[Joe]

Sounds like this: http://golbornevintageradio.co.uk/forum/...hp?tid=513

   

- Joe

[pwdrive]

Yes Joe, that kind of arrangement, it does have some obvious disadvantages.

Lawrence.

[lol30]

hi all
i have replaced the capacitors c10/c22/c23/c25/c27 & has made a minute improvement but it still is very faint & will only tune on bbc radio 5 live,it does get a bit louder when i touch the rod aerial coil.Anymore input gratefully received,i think i will do as yorkie suggested & have ago at making a signal tracer / injector in the next few weeks.
regards laurie

[Joe]

I've moved and renamed this thread.

We don't do 'Off Topic' here but it will make it easier to find for people who haven't been following it from the beginning.

- Joe

[pwdrive]

Doing internet diagnosis can be difficult, however from what you describe the receiver is tuning albeit only one station, this would suggest that the mixer is at least working but as to weather the mixer is working as it should it's hard say.
It would be worth checking if Radio 5 Live is tuning in at the correct position of the tuning dial/scale, also a good visual inspection is always worth a try for wires off, broken ferrite rod or loose connection, dry soldered joints can sometimes show up by tapping around gently with the blunt end of a screwdriver or a plastic knitting needle.
Another visual check is the IF transformer cores, don't try and adjust them though, just have look to see if they have been interfered with, same goes for any trimmer capacitors.
As said, it's difficult to give a more accurate diagnoses at the moment, faults in the RF, Mixer/Osc and IF can all give low signal gain/poor performance.
The fact that the signal increases when you touch the tuning coil on the ferrite rod suggests that the RF tracking might be a bit out, maybe linked to the fault, my advice at this stage though is don't go twiddling any adjustments at all.

Lawrence.

[lol30]

I've moved and renamed this thread.

We don't do 'Off Topic' here but it will make it easier to find for people who haven't been following it from the beginning.

- Joe

apologies about that i am a bit new to this & accidently started a new one
laurie