boss mt-2 runs out of juice

[Ed G.]

A friend gave me a boss mt-2. It was broken, so I set out to find out what was wrong. I figured it was a faulty op-amp, so I went and decided to change out all the mitsubishi chips with JRC NE5532 chips, what the hell.
Well, it works now, but when I was playing some fast licks on the high strings, it couldn't 'keep up' with the licks, it's like it temporarily ran out of juice. I read somewhere someone posted that the 5532 sucks current (must be true, I left the cables plugged in, and overnight, it was deader than Elvis.
For reference, I can leave the bsiab plugged in for a couple nights and it will be weak, but have enough juice to play.

So I'm wondering, if maybe it's sucking too much current as I play (but I wonder again, as it's just doing it to fast licks on the high strings, I don't notice it too much on the low strings) and maybe I should increase a power supply capacitor or what? Later on i'll try it with my power supply (my pedalboard is apart right now) and see if that's the problem.

[Fret Wire]

It does use around 20ma, maybe the 5532's brought it's draw up to a critical level. 20ma is pretty stout for a dist. box. Still, you'd think it would still work fine until the battery drops below 8v. Curious to hear how it goes with a power supply. Seems like it might be something elsewhere in the ckt. Maybe the ckt doesn't jell with the 5532's without further ckt adj.
http://www.bossarea.com/loadpage.asp?file=boxes/mt2.xml

[MartyMart]

Ed, when you say "ran out of juice" are you just talking about after leaving it on all night, or do you mean "in general" the high played riffs
are getting "thinner" or "splatty" sounding, good battery or not ?
Thats what I think you're asking, so I'm just wondering if those 5532's are sending another part of the circuit into "mis-bias" or something ...?
Let me know if that's what you mean  :wink:

Cheers,
Marty.

[Ed G.]

By 'run out of juice' I mean that while I'm jamming away, for a brief moment, and I think you would only notice if you were playing, but the fluid continuity of your sound 'disconnects' for a split-second. It's like it can't reproduce sound for that very, very short period of time. It's hard to explain, you have to play it. It doesn't sound mis-biased, at least not that I can notice. It's not splatty sounding or anything, it just temporarily shuts off for a very, very brief period. I think the battery I had was good, but I'll try a fresh one and see if it does the same.