Tube amp working/now not working
- Thread starter lanterns
- Start date
BlindCowboy
New member
lanterns said:
Make what a lower wattage? You took out the tubes, and put the same one's back in? Or different ones?
its a +100 watt head. i took two of the four 6550s thinking it would cut the power in half. i turned it on and got no sound. I put them back in and still nothing. the amp worked fine before.
sidenote
before this i used the line out (with no speaker load) into my 4 track.
i'm afraid i've damaged the amp. the tubes glow and it gets power. just doesn't drive a speaker.
sidenote
before this i used the line out (with no speaker load) into my 4 track.
i'm afraid i've damaged the amp. the tubes glow and it gets power. just doesn't drive a speaker.
hmmm.
1. i tried the two closest to me. they go in pairs diagonally
x x
x x
from the back of the amp it would be the pair closest to me.
2. then i tried different setups of the pair. i didn't have time to check if the cab was blown but last time i checked, only one spkr was blown.
1. i tried the two closest to me. they go in pairs diagonally
x x
x x
from the back of the amp it would be the pair closest to me.
2. then i tried different setups of the pair. i didn't have time to check if the cab was blown but last time i checked, only one spkr was blown.
Hard2Hear
New member
There are 3 things that can screw up a tube amp.
1. Running an unbalanced load
2. Running no load
3. Pulling power tubes at random.
Those individually are probably cause of messing up a transformer or blowing out something in the amp. You happened to do all of them, so you may want to find out the name of guitar amp techs in your area. I'm not trying to be a jerk or anything, those are 3 really bad things to do to a tube amp.
By the way, I really like that Sunn amp. I've played it and it's killer.
H2H
1. Running an unbalanced load
2. Running no load
3. Pulling power tubes at random.
Those individually are probably cause of messing up a transformer or blowing out something in the amp. You happened to do all of them, so you may want to find out the name of guitar amp techs in your area. I'm not trying to be a jerk or anything, those are 3 really bad things to do to a tube amp.
By the way, I really like that Sunn amp. I've played it and it's killer.
H2H
Hard2Hear
New member
" Sunn Model T Settings
A huge stack of SUNN amplifiers was a common sight at major concerts and festivals of the ‘60’s and ‘70’s...even Woodstock! While the new Model T looks very much like an old SUNN from that era, it is actually an all-new tube amplifier with some unique modern features.
Here’s a list of things to notice about the SUNN Model T.
Discriminating players will dig its "transparent" tube purity. When you plug in a Tele, it sounds like a Tele; a Strat sounds like a Strat, a Guild sounds like a Guild. Inexperienced players may need to be shown how cool this is! It is not like using a $80 distortion pedal, which makes every guitar sound like...a $80 distortion pedal.
The Model T is simple to operate, like all Fender amps. There are no confusing push-pull pots, graphic EQ’s, or other gadgets to get in the way. Many of those "features" make it easier to set an amp the wrong way, plus they dilute the aforementioned tube purity. A simple signal path allows more pick dynamics, and more effective changes from the volume knob on the guitar. Almost like channel switching from the guitar!
The effects loop can be set for separate levels for each channel so you don’t overload your FX device with either channel. You can set it up to have equal levels whether the loop is on or off, and the loop can be completely bypassed with the included footswitch or with the pushbutton on the back of the amp. Almost any effect unit will work with the Model T.
The ARENA/CLUB switch allows 100 or 25 Watt output. This lets the amp be used in a variety of situations, large or small.
The TROUBLE LED’s and BIAS POTS let the user diagnose failed output tubes, install new tubes, and set the optimum bias without the aid of a technician. This saves the customer time and money.
Don’t forget, the SUNN MODEL T 412 enclosure is optimized for use with the Model T head. It is not just an old SUNN or Fender cab with new cosmetics, but a new design by our engineers, and a toneful addition to the line. The big closed-back 13-ply birch "straight" cab provides the thump, and the Celestion G12T-75 speakers make it sizzle."
A huge stack of SUNN amplifiers was a common sight at major concerts and festivals of the ‘60’s and ‘70’s...even Woodstock! While the new Model T looks very much like an old SUNN from that era, it is actually an all-new tube amplifier with some unique modern features.
Here’s a list of things to notice about the SUNN Model T.
Discriminating players will dig its "transparent" tube purity. When you plug in a Tele, it sounds like a Tele; a Strat sounds like a Strat, a Guild sounds like a Guild. Inexperienced players may need to be shown how cool this is! It is not like using a $80 distortion pedal, which makes every guitar sound like...a $80 distortion pedal.
The Model T is simple to operate, like all Fender amps. There are no confusing push-pull pots, graphic EQ’s, or other gadgets to get in the way. Many of those "features" make it easier to set an amp the wrong way, plus they dilute the aforementioned tube purity. A simple signal path allows more pick dynamics, and more effective changes from the volume knob on the guitar. Almost like channel switching from the guitar!
The effects loop can be set for separate levels for each channel so you don’t overload your FX device with either channel. You can set it up to have equal levels whether the loop is on or off, and the loop can be completely bypassed with the included footswitch or with the pushbutton on the back of the amp. Almost any effect unit will work with the Model T.
The ARENA/CLUB switch allows 100 or 25 Watt output. This lets the amp be used in a variety of situations, large or small.
The TROUBLE LED’s and BIAS POTS let the user diagnose failed output tubes, install new tubes, and set the optimum bias without the aid of a technician. This saves the customer time and money.
Don’t forget, the SUNN MODEL T 412 enclosure is optimized for use with the Model T head. It is not just an old SUNN or Fender cab with new cosmetics, but a new design by our engineers, and a toneful addition to the line. The big closed-back 13-ply birch "straight" cab provides the thump, and the Celestion G12T-75 speakers make it sizzle."
Hard2Hear
New member
Do you have this? Maybe it will help.
http://www.mrgearhead.com/sunn/sunnpdfs/guitar/Sunn_Model_T.pdf
H2H
http://www.mrgearhead.com/sunn/sunnpdfs/guitar/Sunn_Model_T.pdf
H2H
i realized on my way home from work that i was probably going from line out into the spkr cab. I was right. I checked and the amp is fine.
The damn thing is so old that the labels on the rear of the chassis are all rubbed out. I didn't realize i was plugged in wrong. Simple mistake. Thanks for the help though. Next time I wont panic!
The damn thing is so old that the labels on the rear of the chassis are all rubbed out. I didn't realize i was plugged in wrong. Simple mistake. Thanks for the help though. Next time I wont panic!
BlindCowboy
New member
1. Sharpy markers work wonders on rubbed labels.
2. Quit pulling tubes.
3. Quit running without a load.
4. Send me the Sunn amp before you blow it up. I'll send you a Frontman 25R. Even swap.
2. Quit pulling tubes.
3. Quit running without a load.
4. Send me the Sunn amp before you blow it up. I'll send you a Frontman 25R. Even swap.
You'll have to pry
the Sunn from my cold, dead hands.
That thing will not quit! I've seen it abused by more than one owner but the Model T is a Tank!
It sounds like shit with a guitar though. Maybe if I could turn it up all the way It'd be cool for like Hard Rock but I don't play the type of music this thing is capable of. It's rad for a bass though anyday!
the Sunn from my cold, dead hands.
That thing will not quit! I've seen it abused by more than one owner but the Model T is a Tank!
It sounds like shit with a guitar though. Maybe if I could turn it up all the way It'd be cool for like Hard Rock but I don't play the type of music this thing is capable of. It's rad for a bass though anyday!