Yamaha spares - oh dear

Sporky

I need a replacement PSU for a Magic Stomp and for a UD Stomp.

So... I email Yamaha Spares, asking if they can confirm the respective PSU model numbers and whether they can supply them direct. Two days later they reply pointing me to a company called Sontec, but not telling me what the model numbers are.

I email Sontec, explaining that I don't know the model number but need one PSU for a Magic Stomp and one for a UD Stomp. They reply after an hour or two saying that the replacement mainboard for a DM (whatever that is) costs £224.

Great. This, I think, is why people buy third party PSUs - the manufacturers just don't care and farm it off to incompetent third parties.

rossyamaha

Magic stomp and ud stomp use 12v ac 1000ma so unless I'm mistaken you want a PA130a. The original was an ac10. The pa is the latest version. 

Sporky

Ace - thanks Ross.

Is that something that a common-or-garden guitar-type shop would be able to get hold of?

rossyamaha

Not sure to be honest. Certainly get them online. 

Sporky

Hmm - the PA130a seems to be 750mA? Is that enough?

ICBM

What's the plug at the pedal end like? I have a large number of spare power supplies… although 12VAC 1000mA is one of the rarer ones I think I may have one.

Sporky

Standard 2.1mm barrel I believe.

I've tried three different PSUs I have here (all 12v AC, 1A) and both the Magic and the UD power up - menus are all fine - but don't produce sound. I seem to recall that happening when the original PSU went wiggy on the UD, but I had a replacement it worked with.

goldtop

Doesn't help you, but it's such an unnecessary faff with these power supplies. It's a delight when you get something that was designed with this issue in mind; the Linnstrument accepts any AC/DC/polarity and voltages from 7.5-12V.

smigeon

Not sure if this is helpful, but 12VAC, 1000mA is the same spec for the EHX English Muff'n, which is a pedal I've used for years. And HotRox sell the PSUs for these as spares. I got one about 5years ago for my pedal, and it's still going strong. It has a weird 2 pin connector though, so you'd have to replace this with a standard barrel...

ICBM

Sporky said:

I've tried three different PSUs I have here (all 12v AC, 1A) and both the Magic and the UD power up - menus are all fine - but don't produce sound. I seem to recall that happening when the original PSU went wiggy on the UD, but I had a replacement it worked with.

Do you have a Variac? Sometimes these things are quite sensitive to power supply voltage - I know they shouldn't be, but sometimes they are.

I have a big silly Boss tuner with a very high current draw which won't power up when it senses slightly too high a voltage - which is what tends to happen when you connect it to a poorly-regulated supply and first turn it on… once it's running the draw is enough to bring the supply voltage down to the proper level, but of course it won't power up in order to do that!

If you can test it by turning the supply voltage down a bit that might at least confirm whether the units are working properly.

Sporky

I do not, alas. Good idea though.

Bridgehouse

Ring Sontek.

I needed two clear plastic ring mounts for pots on a Yamaha bass. My feeling was they were never going to have them. 

They found the the ads on their system and emailed me pdfs of the schematics with all the part numbers on.

I picked the ones I needed, they ordered them and they arrived. Exactly what I needed.

ICBM

Sporky said:

I do not, alas. Good idea though.

Go to France?

Lower mains voltage over there .

guitarmangler

The line 6 power supplies for the pods/dl-mm etc work fine with the ud,magic and dg stomps.
I bought a yamaha dg stomp supply off eBay, it had a small impact on the floor and promptly split in two ! I think I've been through about 5 of those yamaha supplies. 

ICBM

I think it's likely that power supplies in general are some of the worst pieces of crap ever manufactured, even ones from otherwise reputable companies.

I have had to get quite good at various solutions to repair them, which is often made unnecessarily difficult by them being impossible to open without breaking them.

Sporky

Sontec have replied - they can get then from Germany. £35 plus shipping, and a week.

I'm just trying to sell the Magic for £79. This is ridiculous.

Emp_Fab

https://www.amazon.co.uk/d/Electronics-Photo/1000ma-Output-Adaptor-Supply-Transformer/B00TE2B7M0

??

Sporky

Fine on the face of it, but I've tried four 12v AC 1A adaptors without success. The pedals power up, controls function but no audio.

Both worked when I got them, but were always fussy about PSUs.

ICBM

Is it worth trying some sort of lash-up with a drop resistor to see if it is something to do with the supply regulation?

Sporky

That's a decent plan. I'll knock something together.

Danny1969

I have a 12V AC 1 amp you can have, it's new but it sounds like something else is wrong

Does it use 12V AC to obtain a duel 12V + - supply for some opamps ? if so you might find the control 5V single supply works but the duel supply doesn't