Members gardo Posted July 21, 2015 Members Share Posted July 21, 2015 I have 3 very different amps with spring reverbs of different sizes. One thing they have in common is that a certain combination of frequency and volume produces a rattle. Any suggestions for a blanket or a bag or some type of insulation on the tank? Or maybe a completely different approach? Link to comment Share on other sites More sharing options...
Members badpenguin Posted July 21, 2015 Members Share Posted July 21, 2015 Check the little rubber grommets between the tanks and the chassis. Tighten the screws a hair, and that should fix it. Link to comment Share on other sites More sharing options...
Members gardo Posted July 21, 2015 Author Members Share Posted July 21, 2015 I'll check that. a simple adjustment is always the best solution if it works Link to comment Share on other sites More sharing options...
Phil O'Keefe Posted July 21, 2015 Share Posted July 21, 2015 Are the tanks inside bags? If not, that can also help. Damping the springs won't work though - it will kill the reverb completely. You can also try using even heavier and thicker rubber "shock mounts" between the tank and the cabinet... that can help lessen the mechanical coupling between the two, but that probably won't do anything to reduce sympathetic resonance / vibration from the speaker's acoustical output from causing the springs to resonate and vibrate if you play at really, really high volume levels. Link to comment Share on other sites More sharing options...
Members gardo Posted July 21, 2015 Author Members Share Posted July 21, 2015 Are the tanks inside bags? If not, that can also help. Damping the springs won't work though - it will kill the reverb completely. You can also try using even heavier and thicker rubber "shock mounts" between the tank and the cabinet... that can help lessen the mechanical coupling between the two, but that probably won't do anything to reduce sympathetic resonance / vibration from the speaker's acoustical output from causing the springs to resonate and vibrate if you play at really, really high volume levels. I never considered dampening the springs my original thought was to use some sort of bag but I'll take a look at the rubbber mounts first. My oldest amp is a '67 so the rubber may be completely gone my now. Link to comment Share on other sites More sharing options...
Members AlamoJoe Posted July 21, 2015 Members Share Posted July 21, 2015 I suggest you try using the silicone bags they use for breast augmentation. Works really well, but every now you'll hear a contented "Sigh" coming from the tank. Link to comment Share on other sites More sharing options...
Members gardo Posted July 22, 2015 Author Members Share Posted July 22, 2015 I suggest you try using the silicone bags they use for breast augmentation. Works really well' date=' but every now you'll hear a contented "Sigh" coming from the tank.[/quote'] But won't that also give it a fake, pumped up sound? Link to comment Share on other sites More sharing options...
Members WRGKMC Posted July 22, 2015 Members Share Posted July 22, 2015 You may want to check the springs in that old tank too. Normally they are fairly straight. When tanks get real old the springs can sag badly and even bottom out. When that happens its time for a new tank. They aren't that expensive either ranging from $20~45 depending on weather its a long or short tank. Also check the rubber bumper at the center of the springs if it has one. These are often made of foam or rubber and can become deformed and touch the spring. They prevent the spring from banging around too much moving the amp. I've had to trim many of these with an Xacto knife or re-glue them in place depending on the age of the tank. If you go for replacement, be sure you buy one that's the right impedance for your amp. Tanks can range from very low impedances of like 8 ohms in a tube amp to very high impedances of 10K in Solid State amps. You can buy a tank bags cheap too. Probably look better then some rig. Found some here for about $15 but you can probably find others.http://www.accutronicsreverb.com/ Link to comment Share on other sites More sharing options...
Phil O'Keefe Posted July 22, 2015 Share Posted July 22, 2015 I probably should have posted this the other day... this article has all the info on tank codes, types, etc. Link to comment Share on other sites More sharing options...
Members gardo Posted July 23, 2015 Author Members Share Posted July 23, 2015 You may want to check the springs in that old tank too. Normally they are fairly straight. When tanks get real old the springs can sag badly and even bottom out. When that happens its time for a new tank. They aren't that expensive either ranging from $20~45 depending on weather its a long or short tank. Also check the rubber bumper at the center of the springs if it has one. These are often made of foam or rubber and can become deformed and touch the spring. They prevent the spring from banging around too much moving the amp. I've had to trim many of these with an Xacto knife or re-glue them in place depending on the age of the tank. If you go for replacement, be sure you buy one that's the right impedance for your amp. Tanks can range from very low impedances of like 8 ohms in a tube amp to very high impedances of 10K in Solid State amps. You can buy a tank bags cheap too. Probably look better then some rig. Found some here for about $15 but you can probably find others. http://www.accutronicsreverb.com/ Alot of things to look at. It was checked by a good tech about 2 years ago but things change so I'll pulit and have a look. If I need a bag this is where I'll shop Thanks Link to comment Share on other sites More sharing options...
Members gardo Posted July 23, 2015 Author Members Share Posted July 23, 2015 I probably should have posted this the other day... this article has all the info on tank codes' date=' types, etc[/url']. Today has benn a busy day,we made a quick trip to the beach.I'll be studying the article as soon as I get a chance.Thanks for the info Link to comment Share on other sites More sharing options...
Members AlamoJoe Posted July 23, 2015 Members Share Posted July 23, 2015 Well...First you have to know it's "Fake" Link to comment Share on other sites More sharing options...
Members jtr654 Posted July 23, 2015 Members Share Posted July 23, 2015 Ampwares.com is where I get reverb tanks. Link to comment Share on other sites More sharing options...
Phil O'Keefe Posted July 23, 2015 Share Posted July 23, 2015 Today has benn a busy day,we made a quick trip to the beach.I'll be studying the article as soon as I get a chance.Thanks for the info You're welcome. Please let me know if you have any questions. Link to comment Share on other sites More sharing options...
Members wankdeplank Posted July 23, 2015 Members Share Posted July 23, 2015 Tank bags, wow, who knew? Link to comment Share on other sites More sharing options...
Members DeepEnd Posted July 23, 2015 Members Share Posted July 23, 2015 My Fender FM65R had a bad reverb tank when I bought it used. The tank wasn't in a bag but I learned about them when I was looking for a replacement tank. That said, I replaced the tank but it's not in a bag, and I'm not aware of any issues. Link to comment Share on other sites More sharing options...
Phil O'Keefe Posted July 23, 2015 Share Posted July 23, 2015 The bag isn't going to make a huge difference, but it does give you a bit more isolation, which can help if you play at louder than modest levels. Link to comment Share on other sites More sharing options...
Members gardo Posted July 24, 2015 Author Members Share Posted July 24, 2015 You're welcome. Please let me know if you have any questions. Willl do, but it may be a few days 'til I get time Link to comment Share on other sites More sharing options...
Phil O'Keefe Posted July 24, 2015 Share Posted July 24, 2015 Willl do, but it may be a few days 'til I get time We'll be here. Link to comment Share on other sites More sharing options...
Members gardo Posted July 28, 2015 Author Members Share Posted July 28, 2015 I had some time to look at the article. Good stuff but way more than I need. On the Ampeg it's a baisc hardware problem ,it needs good rubber for the mounting screws. The amp is a '67 Gemini 1Were these tanks made by someone other than Accutronics? It looks to be original but the code is completely different Link to comment Share on other sites More sharing options...
Members gardo Posted July 29, 2015 Author Members Share Posted July 29, 2015 I pulled the reverb tank out of the Ampeg. It was made by Gibbs Manufacturing and Research a subsidiary of Hammond made in USA so it is originalThere was no trace of the rubber mounting left.so I think we know why it rattled.. A quick trip to the store and I'll be playing it. If it sounds good I won't have time to follow up,Ill be busy enjoying it. Link to comment Share on other sites More sharing options...
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