Noob tube question - VBA400
I recently picked up a Marshall VBA400 bass head used on my local Craig's list. Thread can be found here: http://www.talkbass.com/forum/f15/ma...400-a-1014968/
I know that the head will run at either 4ohms or 2ohms as stated in the manual as well as the back of the head. I will run the amp through my NV610 (4ohms) for gigging.
Now my question... My practice cab is a TC RS2x10 that is said to be 8 ohms. My NV610 lives in my garage as it is just to unruley to carry up and down a flight and a half of stairs to my "music room".
If I were to hook up this Marshall head to an 8ohm load, would I damage the amp? Typically I won't be cranking the amp and only using it for practicing myself at night, rather quietly.
Appreciate your wisdom TB! I certainly don't want to do any damage, but would like some opinions. Kinda hoping I can just to get more time with the head.:bassist:
If you're playing it at low volume it should be fine. Many say you should not run an amp with a speaker higher than the output impedance of a tube amplifier but I have never found this to be a problem within reason. Maybe more of an issue if you were running a 16 ohm speaker on a 2 ohm output but 4 to 8 at low volume is not going to damage anything. There is an impedance mismatch there though so the power output will be less with a higher impedance load but you are not concerned with that at low volume. What you never ever want to do is run without a speaker load. This causes inductive kickback into the output tubes which many amps, including Marshalls have protection diodes in place to prevent damage to the output tubes and transformer windings.
Thanks for the reply Insanityamps... the head was dropped off at my tech on Monday. I aksed him to give it the once over on everything. Should have it back by the end of the week.
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