this is an unregulated PSU, it needs load to output the rated voltage
once powering the SC-55 voltage will be fine

If you consider using another psu anyway, please keep in mind that the polarity is plus outside and minus inside - vice versa to most other PSUs.

keropi wrote on 2024-01-30, 08:29:

this is an unregulated PSU, it needs load to output the rated voltage
once powering the SC-55 voltage will be fine

Thank you so much for that information. Is it recommended to replace the original PSU (31 years old) with a Roland PSB-240A? Or are the original PSUs pretty robust? I don’t want to damage my unit with bad power.

pc-sound-legacy wrote on 2024-01-30, 08:51:

If you consider using another psu anyway, please keep in mind that the polarity is plus outside and minus inside - vice versa to most other PSUs.

Thanks for the heads up!

I just use generic RCA multivolt adapters with my various Roland sound modules. As long as you have enough milliamps, 9v and tip negative polarity, any decent power supply will be fine.

Here is Roland’s official guide to which modern psus to use in old hardware: https://www.rolandus.com/assets/press_media_r … dapterGuide.pdf

The sc55 2 should use a psb-1u, which today is replaced by the psb-120, which is what I use for my sc55.