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The Sound City Amp Thread 
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Joined: Mon Oct 27, 2008 9:50 pm
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Location: Sound City, Bristol
Pop off the coloured top and there is a nut underneath.

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Wed Apr 18, 2012 11:26 am
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Mr. Foxen wrote:
Pop off the coloured top and there is a nut underneath.


Thank you. I'll try that tonight when I'm at storage. Is there a specific way to pop off the colored top? Can't remember off the top of my head if I saw something that leads to that or not.

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Wed Apr 18, 2012 10:36 pm
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Blade down the edge if a fingernail won't do it. They tend to come off pretty easily, but because of that, some have been glued.

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Wed Apr 18, 2012 10:49 pm
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Mr. Foxen wrote:
Blade down the edge if a fingernail won't do it. They tend to come off pretty easily, but because of that, some have been glued.


Thanks forbthe tip. Blade worked perfect. Popped them out of my '69 and placed them on my '68. Knobs needed no changing. I did however find out that MKIV color tops (just the color part) are a different size than MKIII tops. The extra set of MKIV knobs I have had too small of color tips to fit snug inside the MKIII knobs. So my '68 has two black for volume and four colors for EQ (I was trying to have them all be colors).

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Thu Apr 19, 2012 5:18 am
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Andreas wrote:
Mr. Foxen wrote:
Bass 12s will probably sound gash, no top end an the wrong sort of speaker breakup, no mid hump. Is the problem that you are trying to get driven tone from a powerful clean amp, or not enough volume? Bass speakers will likely be less sensitive giving you less SPL for the power, so less volume, but means can push amp harder, but their top end roll off will filter out the harmonics from the drive, so you lose again.



Mr. Foxen wrote:
The speakers are the bit that makes volume, if you have more than enough volume, but they are breaking, turn down. More likely you are pushing too much low end, rigging a high pass would be best. hemp isn't an inherently strong cone material (otherwise PA drivers would be made from it), just a stronger speaker would be better (higher Xlim on the spec sheet), but you have to trade off sensitivity, a 3db drop in sensitivity means you have to push twice the power for same volume, so if you get 3db more sensitive speakers, you'll need to push half power for same volume and overpowering them shouldn't be an issue.


We have two guitars and no bass player, so we're not too reliant on top end in his guitar, he doesn't have a normal guitar sound, it sounds rather like the missing link between guitar and bass ATM. Less sensitive speakers sounds good though, the 120 sounds good when pushed IMO, but it's too loud for concerts.

Picking up on this. The new SC cab I bought has Celestion G12-100's in it and sounds awesome.
I think I'll have to get a quad of those for my other 4x12"...

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Fri May 11, 2012 5:46 pm
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Robbo - have a look at the Electro Voice speakers that HEX CABS is using. Might be right up yer alley.

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Mon May 14, 2012 4:31 pm
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too loud for concerts?


Tue May 15, 2012 4:50 pm
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Got a 120 and love it. It is pretty noisey for the first few minutes and then the noise dies down a little. I was thinking of getting some new preamp tubes. What should I get. I have heard that changing to fresh tubes that the noise will die down. Thanks!


Wed May 23, 2012 6:31 pm
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Location: Sound City, Bristol
The caps are what is doing the noise then dying down, although new pre valves might help too. Also a good clean up.

Might have some spare sound city smarty top knobs going if someone will give me sensible moneyfor them, unless someone wants to buy a whole PA head.

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Wed May 23, 2012 8:21 pm
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oprahwinfrey wrote:
too loud for concerts?

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Wed May 23, 2012 10:23 pm
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