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NAD: Mesa Boogie Bass 400+ score!

Response from Mesa:

Greetings
Thanks for your email. According to the serial # the amp was shipped from the factory on 01/02/2001.
Thanks
Kris

Kris Dilbeck
Product Specialist/Export Parts
Mesa Boogie Ltd.
1317 Ross St
Petaluma, CA 94954
(707) 778-6565 Ext.382
 
I don't believe Mesa is very responsive to email which is why I recommended that you call.
Not my experience (and obvious not Lubin's)
Asked several times for info on old gear (most eighties stuff) and never waited more than one day for reply.

If you buy a new set of Mesa tubes, install both new ones and use the old good tube (of the bad pair) as spare. Should be plug 'n play, unless your amp has had the Bias mod (adjustable Bias)
 
Lublin, Looks like Kris got to your email, and I also responded to your PM - your Bass 400+ left the factory 01/02/2001 - looks fantastic!

FCBass - we reply to ALL emails, usually within a few hours. Keep in mind we are closed Fri-Sun, so sometimes a Thursday email won't get a reply until Monday. We also answer the phone 9am-5pm+, Monday thru Thursday. Thanks!
 
Update:

Re-tubed
Re-fused
Cleaned
Lubed

And..........

Works perfectly!

This is seriously the loudest and craziest amp I've ever owned. I'm not sure I'm man enough for it. It seriously frightens me.

Might be looking to move it.
 
A photo of the 400+ in the functional glory.

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Beautiful amp.. A true classic.. I need to add one of these to my set up..
Nothing like a full tube amp.. Congrats

Scored this Mesa Boogie Bass 400+ locally. It's not functioning due to a blown fuse, so I took a gamble on it. Brought it home, popped it open and the first thing I noticed was that one power tube had a hairline crack in the glass and the glass was milky. Went to remove it and it shattered. That was probably the culprit that blew the fuse. Gotta admit - these things are built like tanks!

I'll give it a thorough in-depth inspection and cleaning, install the new 6L6 tube, new fuse, and lube the pots tomorrow. Should be good to go to give up thick, rich, tubey goodness.

Anyone know how to date these things? Can't find any signs of a handwritten date on the inside, only the serial number on the label.

Photos:

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79053784-FAFF-4E6B-8567-BA8B5EF18D38-10684-00000461F72B8748_zps851b0b8c.gif

DD48A9B0-34B2-4B46-BEB1-04CC4CBD8871-10729-00000466BEEF93AF_zpsd621852e.gif

A6904716-6A47-493C-94AF-48ADD873A3AF-10729-00000466C4B0C4B8_zpsee44398c.gif