tubepre not working

  • Thread starter Thread starter undrgrnd studio
  • Start date Start date
undrgrnd studio

undrgrnd studio

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I gota Presonus tubepre off ebay for a decent price and had to track down an AC adapter. I just got one the other day and tested it out. The thing powers up, but I get no reading on the input meter, and no sound on the output. I tried a condensor mic and a guitar with 0 success. Am I missing something or is this thing shot.
 
1. Did you have the phantom power on for the condenser mic?

2. Are you sure it isn't a European production model, which would run off a 240V adapter?

3. Do any lights come on in the unit when plugged in?
 
scrubs said:
1. Did you have the phantom power on for the condenser mic?

2. Are you sure it isn't a European production model, which would run off a 240V adapter?

3. Do any lights come on in the unit when plugged in?
Click to expand...
+48V button was on for the condensor. Didn't work. I tried all 4 buttons in every combiniation actually. It's def american. The adapter works, the unit powers up, but I get no sound output and no readings on the meter.
 
wow...hmmm.

I assume you checked your mic/line switches....

but maybe more seriously, you might have to check the tubes. I don't know how old or how used it is, but if it is an older model and the previous owner hadn't kept up on maintinence, then it's probably about that time.
 
There's one tube in there. You might want to open it up and take a look at the tube, or try a substitute tube and see if that changes anything. I'm not 100% sure of the internal signal path, but I think it would pass signal even if the tube was bad.

But once you have it open you will be able to check for other damage or problems. Check solder joints, especially around the jacks. You could try to see if there's any water or heat damage.

And you are sure you're plugging the cables into the right jacks? :rolleyes: I only ask because I've made that mistake a few times!
 
SonicAlbert said:
I'm not 100% sure of the internal signal path, but I think it would pass signal even if the tube was bad.
Click to expand...


Very good point. If I remember correctly, I think a faulty tube just means you get a weaker siginal.

Wow, good call! I get used to gear that always works and now this thread reminds me to hit my roots and read up on maintinence again!
 
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