kmcguitars
GuitarArtologist
I was just got a JTM 45 from a friend. He wants me to ebay it for him.
On 10 it has low output (i.e. my fender champ is louder) all tubes are
glowing orange and appear to be original ( I dated it to 89') The amp
has not been used for the last 8 years. The only odd things I've noticed
so far is the Impedance switch was set on 4 ohms ( I doubt the original
owner had a 4ohm cab??) I've got it at 8 ohms now w/t one 8 ohm speaker.
The speaker has no issue's. the other thing is the GZ34 tube fillament
appears to be crooked? Looks like the the leaning tower of pisa. The 1st
thing i will try is swapping some tubes. Can a 5u4gb be used in place of
the GZ 34? I know a GZ34 can't be used in a 5u4gb amp because the voltage
is to high. But how about the other way around?? (just for testing)
If all the tubes check out? what next? The output tranny?
On 10 it has low output (i.e. my fender champ is louder) all tubes are
glowing orange and appear to be original ( I dated it to 89') The amp
has not been used for the last 8 years. The only odd things I've noticed
so far is the Impedance switch was set on 4 ohms ( I doubt the original
owner had a 4ohm cab??) I've got it at 8 ohms now w/t one 8 ohm speaker.
The speaker has no issue's. the other thing is the GZ34 tube fillament
appears to be crooked? Looks like the the leaning tower of pisa. The 1st
thing i will try is swapping some tubes. Can a 5u4gb be used in place of
the GZ 34? I know a GZ34 can't be used in a 5u4gb amp because the voltage
is to high. But how about the other way around?? (just for testing)
If all the tubes check out? what next? The output tranny?
Last edited:
Something is wrong with the output jacks !! With the plug fully in it's a problem. back the plug out a 1/4" IT HAS FULL VOLUME !!
