One of my ST-70's four EL34 (output?) tubes was not glowing yesterday. I moved it around in the socket, and it lighted up, somewhat, but soon faded again. This behavior continued today after I put some de-oxit on and mechanically tightened the contacts. (I thought it was just a loose connection.) Same thing happens in other sockets - so I guess it is a problem in just this one tube.
I am puzzled by the fact that I did not notice the sound change when the tube is not glowing.
What are the options? Is replacing one tube all I should need to do? What advantage might a "matched quad" offer?
The tubes are EL34WXT SOVTEK. I have the original driver board, and I'm going to stick with that for now.
Recommendations to try another brand of output tubes for sonic change are welcome.
Thanks in advance!
I am puzzled by the fact that I did not notice the sound change when the tube is not glowing.
What are the options? Is replacing one tube all I should need to do? What advantage might a "matched quad" offer?
The tubes are EL34WXT SOVTEK. I have the original driver board, and I'm going to stick with that for now.
Recommendations to try another brand of output tubes for sonic change are welcome.
Thanks in advance!