Leak Stereo 30 - UK Vintage Radio Repair and Restoration Discussion Forum

kelvinmunson · 7th Aug 2010, 1:46 pm

Picked up a Leak stereo 30 and I have a problem, I think it may be with the input selector switch which doesn't seem to select the channels correctly, but second opinions would be appreciated. Problem occurrs with all phono input devices and is experienced when switching between mono/stereo functions on the front panel.

With the front panel Function switch in the stereo position I can input to either left or right phono socket and either way I get output from the right channel only.

When I switch to Mono Left input I can input either left or right phono and I get output from both channels.

When I switch to Mono Right input I can input either left or right phono and I get no output from either channel.

With the switch in the mono position it seems to work correctly, Left and Right phono inputs each give output in both channels.

Have I missed something obvious here ?

AndiiT · 7th Aug 2010, 3:55 pm

Hi,
Has the control knob slipped position on its shaft so that the pointer doesn't line up correctly with the legend on the front panel?

Alternatively it may be that one (or more) of the wires that connects to the Mono/Stereo switch has come adrift.

Regards
Andrew

kelvinmunson · 10th Aug 2010, 12:36 pm

Hi Andrew

Thanks for your reply. I have had a look at the selector knob position and it appears to be correct; the switching positions are spread across about 120deg so if it did rotate I think it would be easy to spot.

I have also had a look at the wiring and everything appears intact; I am wondering whether someone might have had it apart and incorrectly relocated some of the wiring..... I guess I should be able to work it out logically from the incorrect switching that results ?

Best Regards
Kelvin

AndiiT · 10th Aug 2010, 10:33 pm

Hi,
If the wiring had been messed around with there should be traces of new solder, another thought that crossed my mind was had the whole switch assembly been rotated relative to the knob, although this is unlikely as I suspect that there is a locating spigot on the switch assembly which fits into a hole on the control panel fasica.

If you want to check the wiring of the switch, the circuit diagram may be available as a download from the link up top

Also check for the tags on the switch touching and causing unwanted shorts.

Regards

Herald1360 · 10th Aug 2010, 11:27 pm

Can't see it "upstairs" so try this:

http://www.magafox.com/tubeamps/Leak...20COMBINED.pdf

kelvinmunson · 14th Aug 2010, 10:38 am

Thanks for the link..... that is going to be be really helpful

7th Aug 2010, 1:46 pm	#1
kelvinmunson Pentode Join Date: Jul 2010 Location: Scunthorpe, Lincolnshire, UK. Posts: 159	Leak Stereo 30 Picked up a Leak stereo 30 and I have a problem, I think it may be with the input selector switch which doesn't seem to select the channels correctly, but second opinions would be appreciated. Problem occurrs with all phono input devices and is experienced when switching between mono/stereo functions on the front panel. With the front panel Function switch in the stereo position I can input to either left or right phono socket and either way I get output from the right channel only. When I switch to Mono Left input I can input either left or right phono and I get output from both channels. When I switch to Mono Right input I can input either left or right phono and I get no output from either channel. With the switch in the mono position it seems to work correctly, Left and Right phono inputs each give output in both channels. Have I missed something obvious here ?

7th Aug 2010, 3:55 pm	#2
AndiiT Octode Join Date: Aug 2005 Location: Saltburn-East, Cleveland, UK. Posts: 1,786	Re: Leak Stereo 30 Hi, Has the control knob slipped position on its shaft so that the pointer doesn't line up correctly with the legend on the front panel? Alternatively it may be that one (or more) of the wires that connects to the Mono/Stereo switch has come adrift. Regards Andrew

10th Aug 2010, 12:36 pm	#3
kelvinmunson Pentode Join Date: Jul 2010 Location: Scunthorpe, Lincolnshire, UK. Posts: 159	Re: Leak Stereo 30 Hi Andrew Thanks for your reply. I have had a look at the selector knob position and it appears to be correct; the switching positions are spread across about 120deg so if it did rotate I think it would be easy to spot. I have also had a look at the wiring and everything appears intact; I am wondering whether someone might have had it apart and incorrectly relocated some of the wiring..... I guess I should be able to work it out logically from the incorrect switching that results ? Best Regards Kelvin

10th Aug 2010, 10:33 pm	#4
AndiiT Octode Join Date: Aug 2005 Location: Saltburn-East, Cleveland, UK. Posts: 1,786	Re: Leak Stereo 30 Hi, If the wiring had been messed around with there should be traces of new solder, another thought that crossed my mind was had the whole switch assembly been rotated relative to the knob, although this is unlikely as I suspect that there is a locating spigot on the switch assembly which fits into a hole on the control panel fasica. If you want to check the wiring of the switch, the circuit diagram may be available as a download from the link up top Also check for the tags on the switch touching and causing unwanted shorts. Regards

10th Aug 2010, 11:27 pm	#5
Herald1360 Dekatron Join Date: Feb 2007 Location: Leominster, Herefordshire, UK. Posts: 16,536	Re: Leak Stereo 30 Can't see it "upstairs" so try this: http://www.magafox.com/tubeamps/Leak...20COMBINED.pdf __________________ ....__________ ....\|____\|\|__\|__\_____ .=.\| _---\__\|__\|_---_\|. .........O..Chris....O

14th Aug 2010, 10:38 am	#6
kelvinmunson Pentode Join Date: Jul 2010 Location: Scunthorpe, Lincolnshire, UK. Posts: 159	Re: Leak Stereo 30 Thanks for the link..... that is going to be be really helpful