Leak Stereo 30 Plus. Strange whirling sound. - UK Vintage Radio Repair and Restoration Discussion Forum

flowmika · 24th Nov 2018, 11:18 am

Hi.

Just recently purchased Leak Stereo 30 Plus, gave it a good cleaning out and it has worked fine, but now one channel has really dropped in volume. It can be heard if turned up really loud. Have tried the tape monitor slide, but that doesn't change it.Also when I turn the amp off a strange loud whirling noise occurs, it's almost like a crying sound that dies away.

If anybody could shed light on this it would be a great help.

Thanks.

SteveCG · 24th Nov 2018, 11:45 am

When you cleaned it (inside I assume), did you dislodge/move the plug-in cards ?

If so then try gently removing them, cleaning the edge connectors and the sockets they plug into, finally carefully replace them.

flowmika · 24th Nov 2018, 12:15 pm

Hi and thanks.

No I didn't even touch the cards. The volume comes back up occasionally then a fuzzy sound takes over, then it goes low again.

Ted Kendall · 24th Nov 2018, 1:08 pm

Still best to try re-seating the cards as a first step.

Diabolical Artificer · 24th Nov 2018, 4:36 pm

" it's almost like a crying sound that dies away." sounds like it's oscillating, have you had it on a scope?

Andy.

Michael Maurice · 25th Nov 2018, 12:30 pm

If you have some switch cleaner, try cleaning not just the monitor switch but all the switches on the back, try cleaning the connectors of the cards and reinserting them.

Whaam68 · 25th Nov 2018, 7:16 pm

From memory of the one I used to have the tape monitor switch on the front panel could be problematic. Try some servisol on it and work it back and forth. Ahhh I’m thinking of the earlier stereo 30.
Mike

Sideband · 26th Nov 2018, 1:04 pm

Yes to all of the above but don't rule out a noisy transistor somewhere.....I had this on a vintage Japanese amp....drove me mad before I found it.....Most times the amp worked OK but during switch-on and switch-off (mainly switch-off), there was a 'whooshing' noise in one speaker.

24th Nov 2018, 11:18 am	#1
flowmika Retired Dormant Member Join Date: Nov 2018 Location: Manchester, UK. Posts: 2	Leak Stereo 30 Plus. Strange whirling sound. Hi. Just recently purchased Leak Stereo 30 Plus, gave it a good cleaning out and it has worked fine, but now one channel has really dropped in volume. It can be heard if turned up really loud. Have tried the tape monitor slide, but that doesn't change it.Also when I turn the amp off a strange loud whirling noise occurs, it's almost like a crying sound that dies away. If anybody could shed light on this it would be a great help. Thanks.

24th Nov 2018, 11:45 am	#2
SteveCG Nonode Join Date: Jun 2009 Location: Herefordshire, UK. Posts: 2,495	Re: Leak Stereo 30 Plus. Strange whirling sound. When you cleaned it (inside I assume), did you dislodge/move the plug-in cards ? If so then try gently removing them, cleaning the edge connectors and the sockets they plug into, finally carefully replace them.

24th Nov 2018, 12:15 pm	#3
flowmika Retired Dormant Member Join Date: Nov 2018 Location: Manchester, UK. Posts: 2	Re: Leak Stereo 30 Plus. Strange whirling sound. Hi and thanks. No I didn't even touch the cards. The volume comes back up occasionally then a fuzzy sound takes over, then it goes low again.

24th Nov 2018, 1:08 pm	#4
Ted Kendall Dekatron Join Date: Jul 2008 Location: Kington, Herefordshire, UK. Posts: 3,675	Re: Leak Stereo 30 Plus. Strange whirling sound. Still best to try re-seating the cards as a first step.

24th Nov 2018, 4:36 pm	#5
Diabolical Artificer Dekatron Join Date: Jul 2009 Location: Sleaford, Lincs. UK. Posts: 7,670	Re: Leak Stereo 30 Plus. Strange whirling sound. " it's almost like a crying sound that dies away." sounds like it's oscillating, have you had it on a scope? Andy. __________________ Curiosity hasn't killed this cat...so far.

25th Nov 2018, 12:30 pm	#6
Michael Maurice Moderator Join Date: Feb 2006 Location: Wembley, Middlesex Posts: 7,225	Re: Leak Stereo 30 Plus. Strange whirling sound. If you have some switch cleaner, try cleaning not just the monitor switch but all the switches on the back, try cleaning the connectors of the cards and reinserting them. __________________ Forum Moderator http://www.michaelmauricerepairs.co.uk/

25th Nov 2018, 7:16 pm	#7
Whaam68 Hexode Join Date: Feb 2007 Location: Luton, Bedfordshire, UK. Posts: 457	Re: Leak Stereo 30 Plus. Strange whirling sound. From memory of the one I used to have the tape monitor switch on the front panel could be problematic. Try some servisol on it and work it back and forth. Ahhh I’m thinking of the earlier stereo 30. Mike Last edited by Whaam68; 25th Nov 2018 at 7:17 pm. Reason: Correction

26th Nov 2018, 1:04 pm	#8
Sideband Dekatron Join Date: Oct 2003 Location: Croydon, Surrey, UK. Posts: 7,580	Re: Leak Stereo 30 Plus. Strange whirling sound. Yes to all of the above but don't rule out a noisy transistor somewhere.....I had this on a vintage Japanese amp....drove me mad before I found it.....Most times the amp worked OK but during switch-on and switch-off (mainly switch-off), there was a 'whooshing' noise in one speaker. __________________ There are lots of brilliant keyboard players and then there is Rick Wakeman.....