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Post by jclbandsc on Apr 8, 2014 11:10:00 GMT -7
So I got my Rx Jr used last year. I believe it was made in 2008. The previous owner said he had never changed the tubes. I don't think he played it all that much. I play out a good bit, and play at home all the time. However, I don't play loudly at all since our amps are mic'd through the PA when we play out. So I really never get to push the amp.
Should I probably change the tubes? I feel like it's probably just time to do it (Or past time).
Should I change all the tubes, including the rectifier?
What tubes should I get?
And I'm assuming I'll need to take the amp somewhere to get the tubes biased?
I'm pretty new to tube amp maintenance, so I would appreciate any help! Thanks
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Post by headshrinker (Marc) on Apr 8, 2014 11:58:00 GMT -7
Just change the power tubes and maybe the phase inverter. If the rectifier and other preamp tubes are working and you like the sound, leave them be. They last a long time. No need to rebias with the Rx jr. Just get a matched set and you are good to go. With cathode biased amps like the Rx jr how loud you play has little effect on how long the tubes last. Pretty much if the amp is just on or you are using it at any volume you are using up the power tubes at about the same rate.
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Post by jclbandsc on Apr 8, 2014 12:30:08 GMT -7
Just change the power tubes and maybe the phase inverter. If the rectifier and other preamp tubes are working and you like the sound, leave them be. They last a long time. No need to rebias with the Rx jr. Just get a matched set and you are good to go. With cathode biased amps like the Rx jr how loud you play has little effect on how long the tubes last. Pretty much if the amp is just on or you are using it at any volume you are using up the power tubes at about the same rate. Thanks for the reply! I thought I had heard that before.. That you don't need to bias the tubes in an Rx jr.. Can you tell me why that is? Sent from my iPhone using Tapatalk
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Post by headshrinker (Marc) on Apr 8, 2014 13:16:51 GMT -7
It's because it is cathode biased rather than fixed bias. Most DrZ amps are cathode biased but not all. Most EL-84 amps are, but again not all. If you do a quick internet search on them or something like cathode vs fixed bias it will explain the differences.
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Post by jclbandsc on Apr 8, 2014 14:18:37 GMT -7
Cool. Thanks
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