Obviously, as he is measuring resistance, you have to set it on resistance (Ohm). And he mentioned the ranges usually it will be between 1 Ohm and several hundred Ohms.
Hi Thanks for your video! Does it matter if its a solid state amp, like the fender Deluxe 90 , which has a spring reverb tank? The reverb just sort of stopped working normally, (intermittant now and seemingly not full range). If its a bad tank whats the best replacement for this amp. and 2,3,4 spring? Thanks for your help
My Accutronics tested bad (no more than 5 hours on the amp) and I ordered a MojoTone before I saw your video. Any experience with them as far as reliability/quality?
Is it tube driver and recovery? or opamp? A weak recovery tube is a common problem. Check wire on the tank going to rca jack and the little connectors going to the coil on each end. Check the RCA cable going to the amp. If all that is good, you need to figure out if the driver or recovery stage has the weak signal. If you give the tank a wiggle with the reverb turned up, there should be a fairly large splash of sound. If it's low then likely the recovery stage has a problem.
@@amp_mechanic the wires and springs in the tank look good. I did the ohm check from the end of the rca cables. The amp has two EL84 output tubes plus one 12ax7 so I'm thinking there is an opamp inside the chassis. If I take the tank out of the amp and move the springs with my hand, the reverb sounds strong. But with the guitar plugged in and the reverb on 10 it is barely audible.
I've watched videos indicating input to input and output to output regarding reverb connections on the Fender amps. you've indicated the opposite. Please explain, who's right?
If you hook it up one way and it doesn't work, swap them. Most older fenders, if you're looking at the back of the amp, the right rca jack on the amp chassis goes to reverb pan input. The left goes to the reverb pan output. But some do label it the opposite. It's not a big deal, just swap the cables.
I have a Marshal DSL 100 H the reverb is working. The reverb level is very low. Just to hear it. I have to set the levels at classic reverb and ultra at both at 10.. It is there but a very short tail of reverb. If I run the reverb control at position 5-6 the reverb is not present. Suggestions ? Also when i insert the foot switch it changes the setting. Please help
Normal procedure is try a tube swap first. Then check cable connections. If that checks out, move on to the tank, could be a wire inside partially broken. If all that checks out you might need a new tank. Also be sure to check that the pot on the amp is ok but, rarely have I seen that be the failure point.
Amp mechanic, any reasons why the the reverbs input is very low impedance like 0.3 ohms it's in the middle ohms and the output of the revert tank is very high impedance isn't that kind of backwards because you're loading the signal down if the input is very low impedance it should be the other way around that the the output cuz on most buffer units buffer pedals that output is very low impedance and the input is very high impedance but the reverb tanks it's reversed and the the input of the reverb tank is very low impedance and the output of the river tank is very high impedance so it seems like it's a it's going to wreck your signal your signal level and signal power correct me if I'm wrong
Yeah, that's not the way it works. It's using the driver tube output through a transformer that changes high voltage for current, hence the lower impedance for the tank input, it needs to physically move the springs. The higher impedance on the output is more optimal for the grid of the recovery tube. Kind of like how a higher resistance value on a pickup makes it hotter. Not quite the same but similar.
All the tanks I've seen have the RCA's on a fiber board to isolate the outer sleeve from the chassis of the tank. Pos and Neg are just connected to either side of the coil.
Hello my friend, is there any option to repair the transducer?? I tested my reverb tank from my marshall and the output transducer is bad same as yours
You'd have to strip the coil and re-wrap with new wire. They are simple devices but in most cases it's easiest to buy a decent quality replacement tank like ones from MOD.
@@amp_mechanic Hi friend! Thank you very much for the answer, in fact yes, I was able to rewind and repair the transducer, it was a matter of patience and delicacy to avoid breaking the coil cable again, it is a tedious job but it is possible to do it. Those reverb tanks are very fragile.
He’s putting the multimeter (set to resistance) directly across the input connector terminals then across the output connector terminals. Neither should be open circuit or high resistance. Hence he states the output side is ‘OL’ on the multimeter. Thats open circuit, or knackered to us mortals!
I have been trying to repair my reverb tank because I cant afford a new one, I have got the issue narrowed down to one of the coils, I unplugged each coil, and when I test the connection point on the coils, one of them has continuity and the other doesnt. I assume that the one with no continuity is probably at fault? I guess what Im asking is, both of the coils should have continuity right?
Thank you - another amp saved 🙂. One pickup is open circuit
It wouls help if you mentioned where to set your multimeter.
Obviously, as he is measuring resistance, you have to set it on resistance (Ohm). And he mentioned the ranges usually it will be between 1 Ohm and several hundred Ohms.
Hi Thanks for your video! Does it matter if its a solid state amp, like the fender Deluxe 90 , which has a spring reverb tank? The reverb just sort of stopped working normally, (intermittant now and seemingly not full range). If its a bad tank whats the best replacement for this amp. and 2,3,4 spring? Thanks for your help
Still applies to checking the tank. Just the driver and recovery stage in the amp will be done with an opamp or some kind of transistor. Good luck.
It’s a little vague when you say put it “there “
With your hand in the way.
Well, there's only 2 wires on each side. One runs to the tip contact, the other to the sleeve. Put one probe on each.
My Accutronics tested bad (no more than 5 hours on the amp) and I ordered a MojoTone before I saw your video. Any experience with them as far as reliability/quality?
I don't think I've seen a mojo tank. Which in this case is probably a good thing. Mojo tends to make decent stuff so I'm sure it will be fine.
I have a musicman amp with weak reverb. The amp has an accutronics tank, and both transducers measure about 175 ohms. What else could it be?
Is it tube driver and recovery? or opamp? A weak recovery tube is a common problem.
Check wire on the tank going to rca jack and the little connectors going to the coil on each end. Check the RCA cable going to the amp. If all that is good, you need to figure out if the driver or recovery stage has the weak signal. If you give the tank a wiggle with the reverb turned up, there should be a fairly large splash of sound. If it's low then likely the recovery stage has a problem.
@@amp_mechanic the wires and springs in the tank look good. I did the ohm check from the end of the rca cables. The amp has two EL84 output tubes plus one 12ax7 so I'm thinking there is an opamp inside the chassis. If I take the tank out of the amp and move the springs with my hand, the reverb sounds strong. But with the guitar plugged in and the reverb on 10 it is barely audible.
I've watched videos indicating input to input and output to output regarding reverb connections on the Fender amps. you've indicated the opposite. Please explain, who's right?
If you hook it up one way and it doesn't work, swap them. Most older fenders, if you're looking at the back of the amp, the right rca jack on the amp chassis goes to reverb pan input. The left goes to the reverb pan output. But some do label it the opposite. It's not a big deal, just swap the cables.
I have a Marshal DSL 100 H the reverb is working. The reverb level is very low. Just to hear it. I have to set the levels at classic reverb and ultra at both at 10.. It is there but a very short tail of reverb. If I run the reverb control at position 5-6 the reverb is not present. Suggestions ?
Also when i insert the foot switch it changes the setting. Please help
Normal procedure is try a tube swap first. Then check cable connections. If that checks out, move on to the tank, could be a wire inside partially broken. If all that checks out you might need a new tank. Also be sure to check that the pot on the amp is ok but, rarely have I seen that be the failure point.
@@amp_mechanic surely a new tank is over kill. It must be repairable without completely replacing!?
I’ve determined that my reverb tank on my dual showman is distorting my sound a bit when reverb is on. What could cause that?
tube, driver or recovery. Bad cable. Broken wire strands inside tank. Bad resistor or cap on the driver or recovery side.
You might have a higher gain 12AX7 tube plugged in where the lower gain 12AT7 tubes should be.
Amp mechanic, any reasons why the the reverbs input is very low impedance like 0.3 ohms it's in the middle ohms and the output of the revert tank is very high impedance isn't that kind of backwards because you're loading the signal down if the input is very low impedance it should be the other way around that the the output cuz on most buffer units buffer pedals that output is very low impedance and the input is very high impedance but the reverb tanks it's reversed and the the input of the reverb tank is very low impedance and the output of the river tank is very high impedance so it seems like it's a it's going to wreck your signal your signal level and signal power correct me if I'm wrong
Yeah, that's not the way it works. It's using the driver tube output through a transformer that changes high voltage for current, hence the lower impedance for the tank input, it needs to physically move the springs. The higher impedance on the output is more optimal for the grid of the recovery tube. Kind of like how a higher resistance value on a pickup makes it hotter. Not quite the same but similar.
mine, just not work, but in the out, Ground are touching the chasis. i don't kno if this is well but not noises when connect to the amp.
All the tanks I've seen have the RCA's on a fiber board to isolate the outer sleeve from the chassis of the tank. Pos and Neg are just connected to either side of the coil.
Hello my friend, is there any option to repair the transducer?? I tested my reverb tank from my marshall and the output transducer is bad same as yours
You'd have to strip the coil and re-wrap with new wire. They are simple devices but in most cases it's easiest to buy a decent quality replacement tank like ones from MOD.
@@amp_mechanic Hi friend! Thank you very much for the answer, in fact yes, I was able to rewind and repair the transducer, it was a matter of patience and delicacy to avoid breaking the coil cable again, it is a tedious job but it is possible to do it. Those reverb tanks are very fragile.
Your finger don't let see where you are puting the probe...
Right where the wires attach on th RCA jack.
So close. Cannot see the precise components you measured which defeats the purpose of the video. An update would be most welcomed! Thanks.
Exactly. Too bad, this is excellent otherwise. I wonder if it’s the little cube thingie or something else lol I’m poking around with my multimeter 😂
He’s putting the multimeter (set to resistance) directly across the input connector terminals then across the output connector terminals.
Neither should be open circuit or high resistance.
Hence he states the output side is ‘OL’ on the multimeter. Thats open circuit, or knackered to us mortals!
I have been trying to repair my reverb tank because I cant afford a new one, I have got the issue narrowed down to one of the coils, I unplugged each coil, and when I test the connection point on the coils, one of them has continuity and the other doesnt. I assume that the one with no continuity is probably at fault? I guess what Im asking is, both of the coils should have continuity right?
Both should have DC resistance. One side should be higher than the other.
@@amp_mechanic Ok thanks
I'm surprise that you cannot buy a replacement transducer to fit into the tank - or get the transducer rewound - seems like such a waste of metal!
If it makes you feel better, if customers don't want the old tanks I save them and cut brackets or spacers out of them.
🤦♂️