One question, what are the yellow .22uf/200v caps? [pic] They look polarized so are they like 'speaker divider' type capacitors? There's 4 of them in this amp.
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1971 Randall RG-90 head, smoking speaker!
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If you start mucking around replacing caps & other parts with the amp nonfunctional at this point, how will you know if you got it correct.
That is why I strongly advise that you troubleshoot the amp & repair it so it works?
Then have at it with replacing parts.Last edited by Jazz P Bass; 06-12-2019, 03:29 PM.
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Its blowing fuses so I'm not gonna turn it on to troubleshoot until I replace all the electrolytic caps, power transistors, bridge rectifier and those TIP30C/29C transistors. Its my best shot. I figure all 50 year old electrolytics can probably benefit from being replaced.
I dont have a bulb limiter, oscilloscope or any of that stuff. I got a DVM and thats all.
How do you troubleshoot when the amp blows its fuse on power up?Last edited by czech-one-2; 06-11-2019, 04:58 PM.
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Originally posted by czech-one-2 View PostHow do you troubleshoot when the amp blows its fuse on power up?When the going gets weird... The weird turn pro!
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Originally posted by czech-one-2 View PostI want to build a simple one without a switch. I'm not sure how to wire it up using EU two prong plugs...
[ATTACH=CONFIG]53965[/ATTACH]
[ATTACH=CONFIG]53966[/ATTACH]Last edited by Helmholtz; 06-14-2019, 01:53 PM.- Own Opinions Only -
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