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Post by elt41217 on Jan 31, 2017 14:52:26 GMT -7
Hello Is it possible to measure or checking an Airbrake if the unit is still working properly? The reason I am asking is, that I recently had two tube faults on two different amps after using them with my airbrake. One is my 71 Plexi The other a Suhr SL68 So maybe it was only an unhappy coincidance but I am very afraid to use the Airbrake again. Tube faults are not the end of the world, but I don't want to harm the Power Trannys or sth. like that. Thanks and all the best Thomas
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Post by purpletele on Jan 31, 2017 18:35:37 GMT -7
Interesting!
@irreversal had an issue with a Weber Mass recently.
Not sure what the issue was on the Weber Mass but it did seem to be responsible for burning the power tubes up.
I would send an e mail to Don at Repairs.
The Brake Light is really a big resistor and they can fail. That seems like a coincidence.
They attenuators are known to be real hard on power tubes especially if you are cranking at bedroom level. That creates a lot of heat dissipation and shortens the tube life.
So its normal for attenuators to hard on tubes, but you should be losing tubes on a regular basis.
my 2 cents
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Post by Deleted on Jan 31, 2017 19:31:30 GMT -7
Weber wasn't exactly forthcoming with me about what went wrong with my Mass 100. That prompted me to sell off my other two Weber Mass Lites and get back into Brake Lites.
My amp tech told me there was likely a failure within the attenuator which lead to an impedance mismatch, which then took out the tubes and fuse.
I've always been leery of attenuators that don't have dedicated OHM selectors (aside from the Brake Lite), especially at higher levels of attenuation. If you have a weak link somewhere, like a bad tube, it seems to be a ticking time bomb.
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Post by zpilot on Feb 9, 2017 3:22:11 GMT -7
Keep in mind when you are using an attenuator you may not realize how hard you are stressing the tubes, transformers, etc. by turning the amp up. Tubes will naturally wear out quicker when run hard; regardless of whether the load is a speaker or a dummy load.
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