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Guitar amplifier tube head for bass?

I use a Marshall JCM 2000 DSL Head as my main bass head and a Fender Dual Showman as my backup. I wrote Marshall years ago to make sure there was no issue, the letter I have directly from them states to use a bass cabinet to avoid blowing speakers, but there are no issues with using a tube guitar head for bass. I also have had no problems running either amp at gig volume, and have never had to pin the knobs.
 
On the subject of using a guitar head as a bass amp, it's possible to do that as long as you hook it up to a bass cab. it's better to use a bass cab with a guitar head because guitar cabs won't handle bass guitars very well. but using bass cabs would be much better Idea. not only does it handle better lows, but it sounds pretty cool too. I once used my brother's once owned hartke gt100 guitar head through an ampeg svt 4x10 and it sounded really awesome. considering that the hartke guitar head is a hybrid guitar head, I was able to get a warm and slightly overdriven sound. it sounded pretty cool. anywho, I would advise using whatever guitar head you have with a bass cab. you just might get some amazing results.
 
For the first few years after I made the switch to bass, I used my Marshall JCM 900 100W Dual Reverb head into a pair of Marshall 4x12 guitar cabs as my bass amp. I played it a minimum of 3 times/week at rehearsal/gigging volume (which were the same), and never had any issues. I did use a lot of distortion (think Lemmy + ), and the amp didn't put out a lot of super low frequencies, though.

Cheers!
:bassist::bassist::bassist:
 
I just wanted to give a short feedback. I have played the amp through a EBS ClassicLine 112. And the sound was fantastic. As we got louder after a while (we always do :) ) i had the push the amp harder, and it got softer and warmer (with out distortion) and it sounded 60's vintage, great sound.

I was struggling a little to get up to the level with the guitar and bass, however the EBS isn't very sensitive (only 93dbw). With a larger sensitive speaker i should be OK. In the worst i might need 2x15" if i should play outdoors.