EL34 not glowing blue
Posted: Tue Aug 16, 2022 7:48 pm
Hey guys,
So last night while jamming with the band, I've notice my Marshall's (1959slp w/PPIMV) volume started fluctuating. It kept its usual volume and dropping down/going up to its regular volume.
The last time it happened the power tubes were going bad, but I've noticed that on V4 and V5 that the tubes weren't glowing blue. I've swapped them for V6 and V7 and it didn't follow the tubes.
Could it be that the screen grid resistors died as well? The power tubes are about 4 years old now.
EDIT: All of the screengrids test at 1k ohm on my DMM
Thanks!
So last night while jamming with the band, I've notice my Marshall's (1959slp w/PPIMV) volume started fluctuating. It kept its usual volume and dropping down/going up to its regular volume.
The last time it happened the power tubes were going bad, but I've noticed that on V4 and V5 that the tubes weren't glowing blue. I've swapped them for V6 and V7 and it didn't follow the tubes.
Could it be that the screen grid resistors died as well? The power tubes are about 4 years old now.
EDIT: All of the screengrids test at 1k ohm on my DMM
Thanks!