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The Acoustic Club

#3,843
StingRay85 said:
My GAS for Acoustic is unstoppable. Got me a 150. There seem to be two different models, are they only different aesthetically?
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Yes, they are essentially the same on the inside. The only variation I'm aware of in the generation-1 blue face and generation-2 black face model 150 heads is a signal coupling component in the tremolo circuit. That wouldn't change the sound at all, so other than looks it really doesn't matter which 150 head you have.

EDIT for clarity: I believe the component change occurred very late in the run of gen-2 heads. There was an optical coupling component that was replaced with something solid-state. I've never encountered one, but seems to me I've seen it on a schematic somewhere. My own black face 150 has the same innerds as a blue face 150.
 
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#3,845
StingRay85 said:
Thanks. I got a blackface one. Coincidentally, the next day a model 150 combo blueface was also for sale.
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I'm guessing you're talking about a guitar combo from the generation-1 135-series, although I'm not aware of any with the same blue scheme as the 150 head. There was a blue-face 160 combo that used the 260 head in a combo cabinet. That's pretty rare.

I should clarify that the tremolo circuit component change didn't occur between the gen-1 and gen-2 heads. I'm going to revise the prior post.
 
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#3,848
#3,851
StingRay85 said:
My 126 has different grips on the side, so its probably like Jack mentioned a 136 with a head swap
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I noticed the different handle. Not sure if it was specific to units shipped abroad, a custom retro-fit, or a rare variation in general as it's the only one I've seen without vinyl strap handles in that size category, and I've looked at dozens if not hundreds just in the past 7 months.

Another thought occurs. Since this amp is based on the narrower 140/150 width head/cabs it is going to be narrower than my 126, which is based on the 'wide' series. Hmmm the plot thickens....
 
#3,853
TomB said:
Am I riight in thinking that the 150, 140, & 136 (and 126?) all had basically the same output power sections (I seem to recall 125 watts)? I know there was some variation in other features - guitar vs. bass, etc.
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The wattage ratings were slightly different if memory serves. My 126 is a different 'generation' so the pwr section could be slightly different in other ways.
I don't own any of the others you mentioned so no first hand experience for comparison.
If you are patient, the doctor(s) will weigh in.
 
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#3,857
TomB said:
Am I riight in thinking that the 150, 140, & 136 (and 126?) all had basically the same output power sections (I seem to recall 125 watts)?
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Yes, all used the the same power amp built on the same chassis. The same clean-channel preamp module was used for channel-A in all amps and channel-B in amps marketed for bass, and a similar module with effects-related circuity added that was used in the B-channel of amps marketed for guitar.

EDIT: As ghostinthemach indicated, the 126 was from generation-3 and it's a whole different animal. It's equivalent to a 120, which is similar to a 220 but with a less powerful power amp section.
 
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#3,859
Hey guys, I need some help. I have my 220 rig at my buddy's practice studio and it's started making squelching background noises and picking up radio interference.
I didn't have this problem in other locations. His house is new, so the wiring is grounded, I'm sure, and the other amps in the room seem ok, although allot of single coil hum, I've noticed.
Do you think I need to take the amp into the shop?
Thanks!
 

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