Jig is pulling your leg. ALL tubes operate on the principle of "thermionic emissions". Without thermionic emission the cathode would emit no electrons and the tube would just be a pretty piece of glass. The noise you are experiencing is oscillation or "feedback" caused by the physical elements inside the tube being too suseptable to external vibrations. BWT, RCA did not manufacture a 6922; they relabled. If it says "made in germany" odds are it is a Siemens. Holland or USA likely Amperex.
Tube Whine noise...Please Help
Hi everyone.
As a newbe to tubes I am having a problem that I need some help on. I just received my Musical Design SP-2 preamp and while it sounds wonderful, occationally there is a high frequency whine/whistling noise coming from one or both speakers. The SP-2 uses 2 6922 that the previous owners said were NOS RCA types. I want to know if the tubes went bad and needs replacing or if there is another problem that I need to look for. Thanks
As a newbe to tubes I am having a problem that I need some help on. I just received my Musical Design SP-2 preamp and while it sounds wonderful, occationally there is a high frequency whine/whistling noise coming from one or both speakers. The SP-2 uses 2 6922 that the previous owners said were NOS RCA types. I want to know if the tubes went bad and needs replacing or if there is another problem that I need to look for. Thanks