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Saturday, December 06, 2008

Properly Biasing Bugera Amps

Views: 5,487
Comments: 4

From EUROTUBES.COM

 

Bugera amps

 

Plate Voltage 480

Bias Range 38mA - 42mA DCV (25watt matched quad)

 

We are getting so many questions about the Bugera amps that I decided to put up a page on them. I don't know how Behringer is getting away with this but these are carbon copies of the Peavey amps in almost every way. The sound quality is pretty good and the build quality is average for today's standards for production amps from what I've seen. The 333 is a XXX clone, the 6260 is a 5150 clone and the 6262 is a 5150 II clone.

 

The power sections on these amps are all XXX style allowing either 6L6 or EL34 type tubes to be used which is a nice option. We have used the JJ 6L6GC's, EL34's, KT77's and the E34L's. Unlike the Peavey XXX amps we have not encountered any problems running the E34L's. The target market for these amps is obviously the Peavey and Mesa seekers who want the best bang for the buck. The Behringer company is the manufacturer and these are a chinese made product thus the lower cost.

 

The bias setup is exactly the same as you will find on the XXX right down to the bias test point. This is one place that Behringer should have deviated from the Peavey design and incorporated test points that actually measure the bias current. Unfortunately Behringer stayed with the Peavey bias circuit that measures the negative voltage and NOT the actual plate current. What this means is that you cannot accurately set the bias using the test points. You need to use a bias probe under one of the tubes so that you can actually measure the bias current. DO NOT be fooled into thinking that you can bias the amp accurately as stated in the Bugera manual and on their website. This is a large batch of Barbra Streisand.

  The bias pot is located right next to the power tubes so if you use a short bias probe you don’t even have to remove the amp from the chassis making a tube change and a bias adjustment a 10 minute job. We have our own Eurotubes bias probes which can be used with any digital multimeter that reads in DC Milliamps for 25.00 and you can also find short probes on ebay.   So I will give the same warning that I give XXX and JSX owners, the bottom line is do not use the factory test points! If you want to do the job right use a bias probe.   As for tubes, these amps ship with chinese preamp tubes and 6L6's. The JJ 6L6GC's are what we use most all the time where going with EL34's will cause you to drop quite a bit of low end. For players that want more of a Brit tone we typically go with the JJ E34L's which have a deeper low end and are very tight and punchy. You can also use the KT77's which are a little bigger on the low end than the E34L's but neither are as big on the low end as the JJ 6L6GC's so if you're going for that big chug the JJ 6L6GC's are the ticket. Unfortunately Behringer also copied the power tube spacing from Peavey and placed the tubes too close together to allow running a quad of KT66's or KT88's. When we get the chance we will do some experimenting to see if a pair of big bottle tubes can safely be run in the outside sockets. Stay tuned!





11:28 am - 4 comments - 7 Kudos - Report!
Comments
BenderFender wrote on Oct 22nd, 2010 9:31am

Great info many thanks.

benderfender

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camara53 wrote on Dec 11th, 2010 3:31pm

We are getting so many questions about the Bugera amps that I decided to put up a page on them. I don't know how Behringer is getting away with this but these are carbon copies of the Peavey amps in almost every way


what peavy amp is the V55 a clone of

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sgcroxton wrote on Mar 1st, 2012 6:48pm

How about the V22 and V55???

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Mazz- wrote on Dec 29th, 2013 4:37am

What's the 1960 classic or 1960 Infinium a clone of, and the Bugera V22, as cool as it seems, looks somewhere in between a Fender Blues Jr. & a Peavey Classic 30...

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