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Sometimes, adding a little mass to the glass of the tube can help lessen the effects of tube microphony. There are also commercially available tube dampers from 3rd party vendors that you can try. Note: we do screen and test every vacuum tube before it is ever installed in a unit and reject those exhibiting excessive microphonics. If tube microphony is affecting your audio at normal recording and listening levels, then you can swap out tubes for ones that are hopefully less microphonic. Solution number one? Don't bang on the unit while you are recording! Yeah, with everything turned up to max, if you tap on the tube or bang on the unit's chassis, you might very well see movement on your DAW meters or hear this through your speakers. In other words, if you have everything cranked up and you have a huge amount of gain after the unit in your recording and then in your monitoring chain, it is like you have a powerful microscope on the issue and it might look like a really big problem to you. The severity of the microphonics might depend on how much gain you have after the unit. It is normal for vacuum tubes to behave like a microphone and transmit mechanical vibrations into the electrical audio path. WHEN I BANG ON THE FACEPLATE, I CAN SEE MOVEMENT ON MY DAW METERS. #SOUND REFERENCE KT88 TUBE POWER AMP MANUAL#Make sure to reference the tube diagram in your manual so you know which tubes (preamp tubes, output tubes, power tubes, etc) to swap in the troubleshooting process. Note: The Massive Passive is used for demonstration purposes in this video, but the process is pretty much the same for any stereo Manley unit. #SOUND REFERENCE KT88 TUBE POWER AMP HOW TO#Watch the video below, “One of My Channels is Out”, and EveAnna will show you how to diagnose which tube has gone bad. ONE OF MY CHANNELS ISN’T PASSING SIGNAL - HOW DO I FIGURE OUT IF IT’S A DEAD TUBE?Įasy peasy. This certainly contributed to their long life. In one case in particular, the amplifiers were never turned off and had their own dedicated air conditioning for the amplifier rack they lived in. We have documented cases of power tubes in Manley amplifiers going over 60,000 hours non-stop in recording studios 24/7/365 without a re-tube. ![]() Other tubes are real troopers and run strong for 30 years. Sometimes a tube decides to end it all early and intentionally misbehaves after a few months. Sometimes UPS sabotages our shipments and after all our testing efforts the tube arrives broken at your place. Some tubes don't make it through burn-in and after a few days they just go noisy or quit. We can only warrant the work that we did, and we cannot guarantee the work that you do. Yes of course you will void your warranty. WILL THIS MAKE MY FACTORY GUARANTY BECOME VOID? I WOULD LIKE TO CHANGE THE RESISTORS IN MY MANLEY UNIT TO MY FAVORITE BRAND. #SOUND REFERENCE KT88 TUBE POWER AMP FULL#Some of the more fussy people of course report that full break-in takes much longer. Folks report that after about a week of break-in that it sounds better. We burn in the gear for a couple of days before it is shipped out. While we're on the subject, make sure your tube gear has plenty of ventilation, preferably some kind of positive airflow, especially if installed in a rack… Leaving tube gear on 24/7 just uses up tube life, and creates a lot of heat which is tough on other components. Do you leave the lights on in your house when you are away? In general we do recommend if you aren't using the gear for more than a few hours you should power it down. While power cycling is a factor for ultimate tube life, there also is a fixed number of electrons that can ultimately jump off the cathode. We generally recommend 45 minutes warm-up time for everything to reach operating temperatures and sound like it's supposed to. MY GEAR SOUNDS DIFFERENT WHEN IT'S FIRST TURNED BACK ON. ![]()
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