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  #41  
Old 2005-02-18, 20:27
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Quote:
Originally Posted by xdislexicx
i find that stressing your speakers is just as, if not more important than clipping powertubes...

to much attenuation just sounds gay.

a good way around this is to use less speakers, so they work more.


Speaker breakup does sound awesome, V30's cranked are so smooth.

Quote:
Originally Posted by John Holland
I'm planning on selling my Crate GT212 for a 5150 212, so I'm trying to learn everything I can about it.

So I can just disable ( unplug ) one speaker to get some attenuation, it seems. Would uninstalling one, two or three of the power amp tubes reduce the volumous output as well? I'm thinking you would be cooking one or two tubes, but having those running at full capacity might sound better than having 4 running at 10-20% capacity. This would certainly be less expensive than having a diminuitive purple THD box atop of my amplifier.


Want to reduce the wattage of your 6505 or 5150 combo? Just unplug the speaker and plug it into the extension cabinet jack. This will cut the the wattage in half as the extension cabinet output only runs at 30 watts.
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Last edited by BLS : 2005-02-18 at 20:33.
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  #42  
Old 2005-02-18, 22:37
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Quote:
Originally Posted by BLS
Speaker breakup does sound awesome, V30's cranked are so smooth.


Want to reduce the wattage of your 6505 or 5150 combo? Just unplug the speaker and plug it into the extension cabinet jack. This will cut the the wattage in half as the extension cabinet output only runs at 30 watts.


Half? That's all I need. I'll definitely try that when I recieve my 5150.
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  #43  
Old 2005-02-19, 00:02
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BLS are you sure about that? I seriously can not tell a difference between the two.
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  #44  
Old 2005-02-19, 00:05
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Roger Crimm from the peavey forums confirmed it.
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  #45  
Old 2005-02-19, 01:06
xdislexicx xdislexicx is offline
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i know that the output from the combo to another cab is only 30w.. but if you disconnect the speakers, i think it would run all 60w out the external jack... otherwise it could cause problems with that other 30w cranked out but with nowhere to go.

just a thought..

but the combo 5150 should be managable on it's own... 60w tube pushing two 12's is still freaking loud, but compared to 120w through four 12's.. it's quite less. because you have half the wattage AND half the speakers...
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  #46  
Old 2005-02-20, 14:55
CarnalAltar CarnalAltar is offline
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Quote:
Originally Posted by John Holland
So I can just disable ( unplug ) one speaker to get some attenuation, it seems.


Be real careful about the new resistance level you're creating by unplugging one speaker. I don't know the wiring config of the 5150 212 offhand, but it could really fuck your amp to plug it into not enough resistance load.

EDIT: Also, about needing low end... I thought the 5150 was hard to get low end on when I first bought it too... But now I just put lows on 6-7, resonance about 2-3 and it sounds great. That's with volume about 1.5 and lead gain on 6-7. I think the volume needs to be at least 1.5 to really rule. Get good pickups. Try tuning down.
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Last edited by CarnalAltar : 2005-02-20 at 15:01.
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  #47  
Old 2005-02-20, 17:59
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Quote:
Originally Posted by CarnalAltar
Be real careful about the new resistance level you're creating by unplugging one speaker. I don't know the wiring config of the 5150 212 offhand, but it could really fuck your amp to plug it into not enough resistance load.

EDIT: Also, about needing low end... I thought the 5150 was hard to get low end on when I first bought it too... But now I just put lows on 6-7, resonance about 2-3 and it sounds great. That's with volume about 1.5 and lead gain on 6-7. I think the volume needs to be at least 1.5 to really rule. Get good pickups. Try tuning down.


I've already got an MXR EQ ten-band EQ, which should rend as much low end as I need. I just forgot, there's a main volume on the EQ pedal ... I could just crank the 5150, get the saturation, and use the EQ pedal's main volume to keep it at a manageable level. There might be some degredation of signal, I don't know, I'll have to try this out.

I'm very intent on keeping my standard/drop D tuning. When the money is available I'll invest in maybe a Carvin seven string.
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  #48  
Old 2005-02-20, 18:01
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Their's plenty of low end on a 5150. Its called a Resonance control!
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  #49  
Old 2005-02-20, 21:53
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Ahh yes well I have the internal speakers disconnected (obviously).
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  #50  
Old 2005-02-22, 19:43
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Goddamnit, my 5150 is a day late
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  #51  
Old 2005-02-22, 23:08
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damn ive got GAS! i just got a new/used amp and i want a 5150 more than anything now.
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  #52  
Old 2005-02-22, 23:31
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Quote:
Originally Posted by arvina
damn ive got GAS! i just got a new/used amp and i want a 5150 more than anything now.


I'm pining for my 85 pounds of pure vitriol to arrive on my front door. It had better be tomorrow, or someone at FedEx will die in an inexplicable accident.

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  #53  
Old 2005-02-23, 19:51
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Quote:
Originally Posted by arvina
does the bv have auto bias?



The older combo BV had auto bias. The heads did not.
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  #54  
Old 2005-02-23, 23:51
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Quote:
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The older combo BV had auto bias. The heads did not.
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  #55  
Old 2005-02-24, 02:54
Kylito Kylito is offline
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Quote:
Originally Posted by BLS
Want to reduce the wattage of your 6505 or 5150 combo? Just unplug the speaker and plug it into the extension cabinet jack. This will cut the the wattage in half as the extension cabinet output only runs at 30 watts.


The outputs are in parallel according to the 5150 manual so it won't make a difference. I've never heard of an internal power splitter on any tube amp. If it's putting out 60 watts, it doesn't matter how many speakers you connect or disconnect. As long as the impedance is matched between the output transformer and your speaker network it will still be 60 watts. If the impedance is not matched (you disconnected/connected speakers and didn't change the output transformer setting, etc...) then you are going to fuck up your amp with reflected power or excessive current depending on what you did.

If you want to reduce the volume safely and don't want to spend the money on a Marshall Power Brake or similar calibrated attenuator, then you can put a resistor in parallel with your speaker network. The resistor should be rated for at least as much power the amp can generate to be safe (double the power is smart). Resistors like this can be found at local salvage yards and electronics stores or online and may require a heatsink. (I bought a 100W 4-ohm resistor for $20 a while back)

Examples for 5150 amp head for guy who started thread:

Four 4 ohm speakers in series total 16 ohms (cabinet set to 16 ohms):
Half power = 16 ohm resistor in parallel and set amp output to 8 ohms
1/4 power = 5.3 ohm resistor in parallel and set amp output to 4 ohms

You can use series resistors as well and take it even further down, but they might negatively affect your tone because coil interactions between the output transformer and the speaker are an important part of tube amp sound. That is why the power attenuators use reactive coils, but there is still a negative affect on sound quality as most people have noticed.


Example for 5150 combo:

This amp is much less flexible. The external speaker network must be 16 ohms. When a plug is inserted in this jack it will switch the output transformer from 16 ohms to 8 ohms because you're external 16 ohm network is expected to be in parallel with the internal 16 ohm network. If you disconnect the internal speakers or leave a cable in the back with no speaker attached your transformer will be mismatched. Basically all you can do to this amp without making modifications is plug a 16 ohm resistive dummy load into the external speaker jack. This will reduce the power by half.


Power notes: every time you reduce the power by half you cut the sound level by 3dB. If you cut it to 1/4 the normal power, that would only be a 6dB drop. Every 6dB drop reduces the range of the cabinet by one half. That means if neighbors could hear you from 200 feet away before, after cutting the power to 1/4 maximum they will only be able to hear you from 100 feet away.


Last edited by Kylito : 2005-02-24 at 07:02.
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