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NGD - Yamaha bass amp
Posted: Thu May 19, 2022 1:04 am
by laurie
I was given a Yamaha VX55B bass amp today. Not working but it turns out to be blown internal fuse due to aging (40 year old) main filter capacitor.
With a full recap and bit of maintenance (dirty pots, etc.) it should be good as new.
Will post pics when I can.
Re: NGD - Yamaha bass amp
Posted: Thu May 19, 2022 5:29 am
by Pepe
Nice!
Re: NGD - Yamaha bass amp
Posted: Sat May 21, 2022 11:39 am
by laurie
- VX55B_1.jpg (251.5 KiB) Viewed 4836 times
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- VX55B_2.jpg (202.88 KiB) Viewed 4836 times
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- VX55B_3.jpg (229.4 KiB) Viewed 4836 times
Re: NGD - Yamaha bass amp
Posted: Sat May 21, 2022 11:40 am
by laurie
Caps are dated 1986. Clear that it needs a recap just from the sound of it.
Ordered new caps plus a dual primary transformer. $80 total and maybe 3 hours work it will be good as new and usable in Australia when I get there.
Re: NGD - Yamaha bass amp
Posted: Sun May 22, 2022 12:14 am
by Old_Iron
laurie wrote: ↑Sat May 21, 2022 11:40 am
Caps are dated 1986. Clear that it needs a recap just from the sound of it.
Ordered new caps plus a dual primary transformer. $80 total and maybe 3 hours work it will be good as new and usable in Australia when I get there.
In a bass amp fresh caps are very important.
Very nice catch Laurie.
Re: NGD - Yamaha bass amp
Posted: Sat Jun 04, 2022 5:07 pm
by laurie
Parts for the recap and transformer swap have arrived.
Am out of town on vacation for the next week. Will get this amp up-and-running in a couple of weeks time
Re: NGD - Yamaha bass amp
Posted: Sun Jun 19, 2022 1:37 am
by laurie
Fixed. It was in fact a failed main filter capacitor. I swapped out all the electrolytics and replaced the power transformer with a dual primary one (230/115).
Sounds pretty good for a 55W amp!
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- VX55B finished.jpg (187.27 KiB) Viewed 4615 times