Tune (Hybrid) preamp Making Loud "Burping" Sounds
My VTL 7.5iii is a hybrid tube/solid state preamp. Lately, it makes loud burping sounds, like what a backfire in a car would sound. I suspect one or both my Amperex Bugle Boy 12 AU7 tubes may be drawing near its useful life or is defective.
Any of my colleagues who could diagnose? I can open the lid and play with the tubes but its a bit of a pain. Thank you. Neal
In tubed equipment, if I hear something strange I always swap out the tubes. Then depending on the age of tubes and configuration (one per channel… two, three, or four) start swapping the old back in until I find the culprit. It has always been a tube.
I always keep an extra set of tubes around. I also listen to my systems a lot daily. |
@soix 🤣🤣 |
