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02-18-2013, 01:37 PM
| | Registered User | | Join Date: Mar 2010 Location: Madrid (SPAIN) | |  Can an Ampeg SVT cl be used only with 4 6550 tubes?
Hello everybody. I've look for some thread about that, but I have find nothing.
The thing is: Some days ago, while playing with my band at the rehearsal place, one 6550 power tube broke down. At that moment, I had no extra tubes to change it for a new one, so I took it off, also I took off another one from the other three and keep on playing (a couple of hours). The question is: How bad is to use a SVT cl only with 4 power tubes? I mean, can it be worst for the amp or it doesn't matter?
Thanks in advance!
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Fender Precision Bass #1060
Ampeg Club #948
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02-18-2013, 01:47 PM
|  | Registered User | | Join Date: Aug 2007 Location: Toronto Ontario Canada | | | Your impedance matching will be off. It's best to run a tube amp the way it was designed to work.
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Paul
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02-18-2013, 01:57 PM
|  | The "G" is for Gustav | | Join Date: Jun 2006 Location: Maryland | | Quote:
Originally Posted by BassmanPaul  Your impedance matching will be off. It's best to run a tube amp the way it was designed to work. | ^ listen to this man.  |
02-18-2013, 02:01 PM
|  | Registered User | | Join Date: Nov 2008 Location: Lake Havasu City, Az USA | | | It will get you by in a pinch but the SVT does not have an impedance selector to more closely match load to the output tubes. Don't make it a habit.
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Just call me B-String 2
GK Club #488 Big Cabs #175 Peavey Amps #92 50+ Club #44
Originally Posted by beans-on-toast
I told my manager that I wanted a regular gig. She told me to try prune juice.
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02-18-2013, 02:32 PM
| | Registered User | | Join Date: Jan 2010 Location: Vancouver | | | I believe it will still run, but it's not recommended. People have accidentally ran it like that, not knowing tubes failed, and their amps still survived without much or any damage, but I don't believe people have consciously done that. |
02-18-2013, 07:30 PM
| | Registered User | | Join Date: Nov 2003 Location: St Louis | | | It will run fine, and you can match it by upping the speaker impedance a bit. 4 ohms tap is now a 6 ohm tap..... 2 ohm tap is now a 3 ohm tap.*
I don't think its exactly great for the tubes, they tend to work harder, and have more voltage across them.
On the other hand, it will get you through the gig....
* if you look at the way the load reflects back to the tubes, this becomes clear...... fewer tubes >>> less output current....higher impedance
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Yes I USED TO work for Ampeg...but I haven't forgotten everything.
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02-18-2013, 08:07 PM
| | | | well one tube is bad, just have to make sure the other tube removed is from the correct side for the pair. |
02-18-2013, 08:20 PM
| | Registered User | | Join Date: Aug 2011 Location: Augusta, GA, USA | | | It's posts like this that make me love that I can pack my Streamliner in a bag in case my SVT fails during a show |
02-18-2013, 08:33 PM
| | | SVT's Fail? nah never  |
02-19-2013, 07:57 AM
| | Registered User | | Join Date: Mar 2010 Location: Madrid (SPAIN) | | | Thanks guys! Even with a great sound only using 4 tubes, make sense to place all of them on, the SVT was made to work that way, I'm not gonna play against the work of many engineers through all this time. I'll not plug my amp before I got all 6550 tubes.
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Fender Precision Bass #1060
Ampeg Club #948
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