I bought a quad set of tubes from one of our members and they arrived safely today except one of them seems to be bad. They are the GE JG5814A's (12AU7 equivalent I'm told). I plugged all 4 tubes into my Rogue Audio Perseus and heard a very loud hum coming from my left speaker. I immediately powered down. What I did next was pull one GE tube out and replaced it with a working JJ tube and fired the system up each time until I found the culprit.
I see these on eBay right now and knowing nothing about tubes I just want to make sure finding a replacement is as easy as it looks.
Here's the replacement I found: http://www.ebay.com/itm/Strong-GE-3-...item19ee6f0b42
Here's where the CP member I bought them from bought them: http://www.polkaudio.com/forums/show...5751-Tubes-NOS
Is this a good match? Also, can I leave the working JJ tube in with the three other GE tubes? Thanks gents