NGD - Yamaha bass amp

[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.

[Pepe]

Nice!

[laurie]

VX55B_1.jpg (251.5 KiB) Viewed 8548 times

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VX55B_2.jpg (202.88 KiB) Viewed 8548 times

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VX55B_3.jpg (229.4 KiB) Viewed 8548 times

[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.

[Old_Iron]

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.

[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

[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 8327 times