17-04-2012, 04:52 PM
Thanks, all - especially Al.
I certainly had no intention of jumping in feet first; my question was prompted more by curiosity about the method.
I was surprised to read Mark's warning about mischievous tropical fish as thought, along with mustards, that these were good. Another handy piece of knowledge.
I've now had a better look at the set.
There are only two electrolytics not on the audio board: C13, specified at 40mfd and C21 - 300mfd. Neither of these were healthy in terms of ESR and C13 also leaked like a tap. In practise C13 was 10mfd and C21 350md, the latter I replaced with a 470mfd.
These changes made no difference so I tried playing the set through my bench amp and it was fine. So, despite my earlier investigations the fault must be on the audio board. This certainly makes sense as there are far more electrolytic capacitors thereon and if he two I've tested are at the end of their days odds are at least some of these are too.
My main problem with this set is that it's far too good condition. There's all sorts of fun I could be having if it was a battered old wreck.
Thanks again for the info.
-Joe
I certainly had no intention of jumping in feet first; my question was prompted more by curiosity about the method.
I was surprised to read Mark's warning about mischievous tropical fish as thought, along with mustards, that these were good. Another handy piece of knowledge.
I've now had a better look at the set.
There are only two electrolytics not on the audio board: C13, specified at 40mfd and C21 - 300mfd. Neither of these were healthy in terms of ESR and C13 also leaked like a tap. In practise C13 was 10mfd and C21 350md, the latter I replaced with a 470mfd.
These changes made no difference so I tried playing the set through my bench amp and it was fine. So, despite my earlier investigations the fault must be on the audio board. This certainly makes sense as there are far more electrolytic capacitors thereon and if he two I've tested are at the end of their days odds are at least some of these are too.
My main problem with this set is that it's far too good condition. There's all sorts of fun I could be having if it was a battered old wreck.
Thanks again for the info.
-Joe
