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The Acoustic Club

Hmmm maybe I should do an Acoustic Family portrait, next chance I get to dally a bit...
Dilly Dally in full effect!
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Andy
The "301" you mention is the powered cabinet of the grail rig 361 Atop the powered cab is the preamp section Loudest 200 Watts you'll ever hear. Capeable of holding its own against 2 Marshall stacks without trying hard

301 came later as matched cab for 370 Head The other taller cab is a 408 which houses 4-15s: 2 facing forward and 2 internal facing up or down in opposition

To the left you'll see other 370 heads atop a 320 which matches with 408. Of course you can mix-n-match as desired
 
Underneath the 370 and 320 is a 405 Transducer cabinet. 412 two horns sealed guitar cabinet. With the 320 plugged into it.

It is my metal bass rig. Really loud too. I use both amp channels. 1 is my bass tone utilizing the graphic EQ and channel 2 is my dirty signal (lows cut highs and mids boosted)

Both channels have their own volume knob.
It works perfectly. Also only one instrument cable involved.
 
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Ok, so the problem is identified.. unshielded wire next to a loose transformator, probably not so healthy. Anyone knows the way to keep these clips in place? It looks as if this broken wire has been replaced too, as it connected on the other side using brown plastic tape. Maybe a stupid question, but why is the top wire going through that block, and the one below is free (but missing the fixing rod)? The other 150 does not have this transformator.

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Didn't you say you're in Belgium? That must be an import transformer for 220V operation. Either way, it looks like the screw bolts the transformer together are missing and somebody ran a wire through where one of the holes. You need some long screws and nuts. The layout of the transformer and bridge rectifier is different than anything I've seen. Usually there's a large capacitor where the transformer is in that pic, and the transformer is farther down towards the power amp board. The board connections are soldered on instead of a card-edge connector, so that might indicate it's one of the later blueface 150's.
 
This is the blackface Jack. I got the transfo and clips fixed strongly, and that already removed the hum. Now there is still a lot of noise when the volume is turned, the sound of way too much gain, while the volume is still low
 
Awesome. I'm curious, is the space behind the original horn on the 201 isolated from the rest of the cabinet below, like a sealed chamber, or is it all one big open box?

Its sealed from the 15s, only one wire going through. There are actually two compartments where the horn is, I will take some pictures later today to try to explain. There is a 4 inch space in between the open horn part, and the 15"s cavity.
 
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