|
Vintage Radio (domestic) Domestic vintage radio (wireless) receivers only. |
|
Thread Tools |
15th Jun 2017, 10:30 pm | #1 |
Banned
Join Date: Oct 2015
Location: Cornwall, UK.
Posts: 849
|
Ultra TR100 battery wires
My daughter bought me a couple of early Fathers Day presents, both were radios one of them is an Ultra TR100 which needs a bit of work. It originally was powered by a couple of AD28 batteries, however somebody has wired it rather crudely to work off one PP9. My question is: Is it ok to run the radio like this, without any other modification? The radio shows a little life, quietly crackling out of the speaker but that's it. It draws 40ma when first switched on then not long after starts to draw copious amounts of current very quickly. The original battery wiring doesn't look like it has been messed with other than the connectors for the AD28's cut off. I have posted some pictures of the wiring and as I said all I want to know is is it ok to keep it wired for the PP9, obviously after it is tidied up a little.
Regards Poppydog p.s. note the very hairy/whiskery transformer. |
15th Jun 2017, 10:38 pm | #2 |
Hexode
Join Date: Jul 2011
Location: Harwich, Essex, UK.
Posts: 429
|
Re: Ultra TR100 battery wires
I wouldnt think running it off a PP9 would harm it as 2 AD28's makes 9V. The original batteries are still available at £4.60 each. I would get the radio working then experiment with both types of battery, see how long they last.
|
15th Jun 2017, 10:46 pm | #3 |
Moderator
Join Date: Dec 2010
Location: Exeter, Devon and Poole, Dorset UK.
Posts: 6,875
|
Re: Ultra TR100 battery wires
The original design was 4.5 + 4.5 with the centre tap going to the speaker.
You can run it off single 9V but you need to add a capacitor in series with the speaker 470uF should be more than enough the cacacitor returning to the -ve or +ve supply to suit you preference. Cheers Mike T
__________________
Invisible airwaves crackle with life or at least they used to Mike T BVWS member. www.cossor.co.uk |
15th Jun 2017, 10:50 pm | #4 |
Hexode
Join Date: Jul 2011
Location: Harwich, Essex, UK.
Posts: 429
|
Re: Ultra TR100 battery wires
I stand corrected, so do you think if that radio has been run off a single 9v for any amount of time without the capacitor it may have damaged it ?
|
15th Jun 2017, 10:58 pm | #5 |
Moderator
Join Date: Dec 2010
Location: Exeter, Devon and Poole, Dorset UK.
Posts: 6,875
|
Re: Ultra TR100 battery wires
If the speaker was crackling it was connected to something !
Cheers Mike T
__________________
Invisible airwaves crackle with life or at least they used to Mike T BVWS member. www.cossor.co.uk |
15th Jun 2017, 10:59 pm | #6 |
Dekatron
Join Date: Dec 2004
Location: East Yorkshire, UK.
Posts: 3,988
|
Re: Ultra TR100 battery wires
That extra brown wire on the battery connector, is it connected to an extra cap as Mike says?
John. |
15th Jun 2017, 11:05 pm | #7 |
Moderator
Join Date: Dec 2010
Location: Exeter, Devon and Poole, Dorset UK.
Posts: 6,875
|
Re: Ultra TR100 battery wires
Here is the output stage as originaly designed
Cheers Mike T
__________________
Invisible airwaves crackle with life or at least they used to Mike T BVWS member. www.cossor.co.uk |
20th Jun 2017, 8:35 pm | #8 | ||
Banned
Join Date: Oct 2015
Location: Cornwall, UK.
Posts: 849
|
Re: Ultra TR100 battery wires
Thanks for all the replies
Quote:
I am not quite sure what to make of that reply. Quote:
Thanks for the snippet Mike, I'll attempt to send a revised one in a bit. Regards Poppydog |
||
20th Jun 2017, 8:47 pm | #9 | |
Moderator
Join Date: Dec 2010
Location: Exeter, Devon and Poole, Dorset UK.
Posts: 6,875
|
Re: Ultra TR100 battery wires
Quote:
such as top Battery -ve and bottom battery +ve (total 9V) then the speaker which is connected to the centre tap would be connected to nothing hence it would not crackle. For the speaker to crackle the common connection must be connected to something to complete the circuit. You should not need to rely on snips get the full circuit. If you are restoring any number of sets I highly recomend Pauls Service disc it may seem a big outlay but considering the convenience and the amount of work it entailed its excellent value for money. Cheers Mike T
__________________
Invisible airwaves crackle with life or at least they used to Mike T BVWS member. www.cossor.co.uk |
|
20th Jun 2017, 9:00 pm | #10 |
Banned
Join Date: Oct 2015
Location: Cornwall, UK.
Posts: 849
|
Re: Ultra TR100 battery wires
The sheet I have got came from up top right. I am going to post a revised snippet with modification for the 9v battery. I would like members just to cast their eye over it to see if its right.
Regards Poppydog |
20th Jun 2017, 10:58 pm | #11 |
Dekatron
Join Date: Nov 2003
Location: Heckmondwike, West Yorkshire, UK.
Posts: 9,642
|
Re: Ultra TR100 battery wires
Yes, that's how it was done when PP11s also became obsolete.
|
20th Jun 2017, 11:18 pm | #12 |
Banned
Join Date: Oct 2015
Location: Cornwall, UK.
Posts: 849
|
Re: Ultra TR100 battery wires
Thanks for the confirmation that its ok. Now I can carry on. Regards Poppydog
|
21st Jun 2017, 4:33 pm | #13 |
Banned
Join Date: Oct 2015
Location: Cornwall, UK.
Posts: 849
|
Re: Ultra TR100 battery wires
Going through my junk I came across some NOS Wima 500uF 10v caps, could I use these? Is the capacitance too high and the voltage to low?, or should I just use new?
Regards Poppydog. |
21st Jun 2017, 4:36 pm | #14 |
Dekatron
Join Date: Feb 2007
Location: Leominster, Herefordshire, UK.
Posts: 16,536
|
Re: Ultra TR100 battery wires
They should be OK. Try one and see.......
__________________
....__________ ....|____||__|__\_____ .=.| _---\__|__|_---_|. .........O..Chris....O |
1st Jul 2017, 10:38 pm | #15 |
Banned
Join Date: Oct 2015
Location: Cornwall, UK.
Posts: 849
|
Re: Ultra TR100 battery wires
I thought I would post these pics on here for the next poor chap whose original TR100 battery leads have been chopped and discarded . I probably could have used a much smaller (physical size) modern capacitor but I had just as well use this nos one although it was rather large and the leads were quite thick . This radio has had a whole heap of issues but the main problem I have now is after replacing a couple of the black Hunts I now have Talk Sport, that's supposed to be on MW, at one end of LW so I might start a new thread hoping to sort this issue .
Regards Poppydog |
2nd Jul 2017, 8:55 am | #16 |
Nonode
Join Date: Jun 2013
Location: Surbiton, SW London, UK.
Posts: 2,801
|
Re: Ultra TR100 battery wires
Ideally, components should mount on the non solder side though.
http://www.maplin.co.uk/p/electrolyt...ucky-bag-n26bg |
2nd Jul 2017, 9:38 am | #17 |
Rest in Peace
Join Date: Mar 2006
Location: N.W. Oxfordshire(Chipping Norton)
Posts: 7,306
|
Re: Ultra TR100 battery wires
Whereabouts on LW are you receiving TalkSport? Here in Oxfordshire Absolute Radio (1197 & 1215kHz can, on some radios, be heard on about 270kHz, which I put down to poor I.F. rejection in the receiver (275kHz + 940kHz# 1215kHz, 940 being of course 2 x 470) A similar thing could be happening with TalkSport's 1089kHz frequency being reproduced at around 169-179kHz, dependant on the I.F. When BBC R. Oxford used to be on 1485kHz, one radio I had at the time would receive it on545kHz for the same reason
|
2nd Jul 2017, 7:42 pm | #18 | |
Banned
Join Date: Oct 2015
Location: Cornwall, UK.
Posts: 849
|
Re: Ultra TR100 battery wires
Quote:
|
|
2nd Jul 2017, 10:25 pm | #19 |
Dekatron
Join Date: Nov 2003
Location: Heckmondwike, West Yorkshire, UK.
Posts: 9,642
|
Re: Ultra TR100 battery wires
The operative word is ideally, it will work just fine as long as it is electrically and mechanically sound. Traditionally, components on the printed side indicate mods, which of course this is, so nothing to worry about.
|
3rd Jul 2017, 10:11 am | #20 |
Moderator
Join Date: Jan 2003
Location: Ipswich, Suffolk, IP4, UK.
Posts: 21,289
|
Re: Ultra TR100 battery wires
We need more information.
Does the set work on LW? What MW frequency does Talk Sport use in your area? At what dial position on LW is Talk Sport received? Is it the same position at which Talk Sport is received on MW?
__________________
Graham. Forum Moderator Reach for your meter before you reach for your soldering iron. |