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The Duncans I have are the 300x2- and that's the way it's written on the amp as well as the manual on the SD site:
http://www.seymourduncan.com/images/support/amp_manuals/bass_300x2.pdf
The numbering scheme kind of confuses me- I've "heard of" the 4000 and the 8000, but the only ones I've seen are the 300x2. I've heard of people owning the 400x2 amps, but never seen one in person.
Looking at the Bass 400 manual- the difference is the bi-amp feature (or dual mono). For the amp that's detailed- the individual "channels" of the amp are disabled- but they're functional on my "stock" head- and I used to get a lot of use out of the dual mono feature- my 4x10 could take more power than my Triad- so I was able to do that with the seperate volume outputs. They're both still good amps- the "chicken head" is a bit fragile- I don't know all the work or repair that's gone on in there before I got it around 13 years ago... The Stock one has never had any serious issues- but they both don't have the same "immediacy" or bottom end that the SWR has. They're still more awesome than any other SS head made before 1990 that I've come across...
mine's a '71. your's, with the tube rectifiers is a bit older. and your grill cloth is original looking to me (the early cloth was ampeg-ish, but without the blue tint).
Thanks John. I think I am going to make another front with black cloth so it matches my Henry 8x8 better (at least color).
I'll borrow the badge but keep the existing panel original.
Do you know where I can find another badge? Regards.
You said Guts right? Here is what happened to my wt 800 (updated from a wt 500) when it flew out the back of my truck and someone drove over it. I guess it was hit a few times because when I got home I went to bring it in the house and thats when I saw it was gone. Drove over 30 miles and found it. It was in a rack. Rack in pieces. Ouch. The guts all over the place. Here is the pick for my good friend who started this thread.

You said Guts right? Here is what happened to my wt 800 (updated from a wt 500) when it flew out the back of my truck and someone drove over it. I guess it was hit a few times because when I got home I went to bring it in the house and thats when I saw it was gone. Drove over 30 miles and found it. It was in a rack. Rack in pieces. Ouch. The guts all over the place. Here is the pick for my good friend who started this thread.
I bought this amp for a friends daughter who is learning bass, and now guitar,keys and drums... I paired it up with a aggie gs112. IMHO it sounds AS GOOD as Eden wt550 or Thunderfunk 550. I've played them all myself at my fairly loud church gig.
I got the yorkville cheap ($125) because the input circuit board was "iffy". turns out two short wires going down to the main board. apparently when some past users would try to tighten the upper input jack which would put torque on the little circuit board (pictured upper right) finally cracking one or both wire soldering connections. a $15 fix.
View attachment 117555
View attachment 117557
Big mistake... That Yorkville 400B rocked!![]()
Nothing a little duct tape won't fix........
1965 Ampeg B15n. Looks to be all original except the power transformer. A little bit of duct tape on the XLR speaker connector.