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Well I did It! I managed to damage my phono pre-am (sigh)

So, I managed to damage my SimAudio Moon 110lp v2!

I am embarrassed to even be posting all this but whatever, perhaps someone could learn from my mistakes.

Recently I had made a post asking for feedback on Tube Phono Stages as I have been pondering about upgrading.

But I also wanted to see if I could perhaps squeeze out more performance out of the SimAudio and hence I also inquire about SUT's and what they can do.

One other aspect that I thought may improve the performance was getting a LPS.

So, I purchased the Ifi LPS as I had read good reviews of it (that unit is fine by that way). 

My SimAudio is 24vdc and I bought the Ifi 24v 2.5amp, thinking that would be the correct LPS.

It was delivered and I unplugged everything from the SimAudio.

The Ifi comes with different plug adapters but the default plug, plugged right in and I thought great, I won't have to use the adapters.

Plugged everything in and the SimAudio blue light came on but no sound!

Pugged the SimAudio back to its power adapter and all sounded fine.

Then I though, well maybe I do need to use one of the adapters and tried the correct one and same result, no sound. 

Went back to the default plug and then the blue light was flashing on the Sim and just a few seconds later, a puff of white smoke!

Unplugged everything immediately but knew right away the Sim was done for.

No other damage, the Ifi is fine and I will be returning that.

But my little SimAudio is no more.

Damn! I really liked that unit and was going to keep that around for a 2ndary system.

I feel horrible. At least it's not a terribly expensive unit but I just feel like crap about the situation.

Now for sure, I am going to have to get a new Phono Stage.

I just don't understand what went wrong, power wise, I thought for sure I was getting the correct unit.

Well, I'm just ranting here and getting it out as only you guys will understand.

Thanks for listening.

Jay 

 

jay73
emann50
27 posts
 

In the meantime, this could keep you listening 

https://www.audiosciencereview.com/forum/index.php?threads/fosi-audio-box-x5-phono-preamp-review.59982/

 

dwette
531 posts
 

Didn't your momma tell you not to play with matches? devil

I hope you get your phono-stage sorted, but the puff of white smoke tells me it's going back for repair. Always check, double check, and triple check what you are doing when you integrate 3rd party solutions for AC or DC power. But I suppose you know that now.

jea48
4,871 posts
 

With regard to polarity - you could get a tech to check your original moon SMPS for voltage, current and polarity - would only take a few minutes.

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@dover Hi, I know you can’t say for sure because you don’t have the equipment in front of you but are you saying that I probably should have used the white adapter, which the ifi did come with?

@jay73 

You can check the voltage and polarity yourself if you have a multimeter.

Make sure the test probes leads are connected to the meter correctly. Black to common, Red to Red.

For a test to see what you will be looking for, use a small battery.

Set meter to DC volts.

Touch the red lead probe to the positive terminal on the battery, and the black lead probe to the negative terminal on the battery. Note the meter will display the DC voltage as well as the polarity. If the polarity is correct you will see a + (Pos) symbol on the display. If you reverse the meter lead probes on the battery terminals a more pronounced visible -- (Neg)  symbol will be displayed.

Now you are ready to check for DC voltage and polarity on the two power supplies,  connected cables and various adapters you used on the new LPS.

Use the SMPS and factory supplied cable as your test base line.

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