Reply with quote #1
I moved and just got around to hooking up my GG. I installed a Home Theatre bypass switch on it so I can toggle back and forth between my GG for 2 channel and my Marantz AV7703 for movies and TV. However, there is a buzz that I was trying to troubleshoot and I replaced the three tubes with 12AX7-A in V1 and V2 and a 12AX7/7025 in V3. I now have a loud hum coming out of the GG that wasn't present before with the original tubes back in. It was super quiet before I swapped out the tubes and I did have any buzzing if kept the two systems separate. Any ideas on what to look for?
Thanks and Happy Holidays,
Reply with quote #2
The cheater plug helped the buzz (Thanks Bruce!). I wish I would have thought about that before I put in the wrong tubes. Since I tried the 12AX7's (and subsequently put the 12AU7's back in), it seems the noise floor is double what it was. There's a distinct hum/noise, where my GG was dead silent before putting in the wrong tubes. Could I have possibly damaged a component (diode, capacitor or PS)?
Reply with quote #3
Ok, the hum is only coming out of the right channel. Any help would be greatly appreciated!
Reply with quote #4
Check interconnect ground, faulty or loose tube pin.