Mesa Boogie 400+ issue?

[1965]

I picked this beast up on Craigslist today, and it sounds killer. I am having one issue with it though: I'm getting a high pitched, frequency modulator sounding squeal from it right after I turn it off standby on powering up. If I turn it back on standby again and then to on it goes away. Any ideas?

[ken_j]

Make a call to Petaluma. They are very helpful on the phone. They are open for calls Monday through Thursday only.

[1965]

Will do. At any rate, this thing sounds fantastic. Anyone else around here have one?

[sharkboy]

I used to have one. It was most amazing. Sadly, I didn't still have it when I finally obtained a Rick bass. I think they would have sounded fantastic together.

Mine had a strange warbling at low volume. It was tolerable, but slightly annoying.

[1965]

I agree, I could really use a 4001 to go along with this. But of course I could use a lot of things. The thing I got going with mine really isn't a big deal, considering it goes away not long after it starts, but I'd like to know what it is.

[bottom4]

I have a Mesa Venture M-Pulse 600 2x10 combo. Sounds great with my Ricks!