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Post by Guitar on Nov 18, 2014 11:10:51 GMT -6
I'm a 1484 lover, mine finally broke, guess I'll have to take it in again. Magnificent amp. People try to buy it off me at gigs sometimes. I put a bright switch on mine, and now it's perfect. Are you technical at all? They are pretty simple to fix. If you haven't, have the tech add a true bias circuit for the output tubes. I think these tend to burn up the bias resistors if there isn't a true bias circuit installed. It seems that older tubes were much colder than tubes today, and putting new tubes in it tends to draw more power through the bias resistors, overheating them. I'm fairly technical, I've built and repaired a lot of stuff, but I have a pretty dodgy record of success with tube amps in particular. The Silvertone is blowing fuses, where would you start with that symptom? I've heard maybe a lot of these old 1484 will blow output transformers. Are bias resistors a common failure in old high voltage amps as well? I really could just use a crash course in tube amp debugging. I've got two dead amps right now. |
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Post by svart on Nov 19, 2014 7:59:31 GMT -6
Are you technical at all? They are pretty simple to fix. If you haven't, have the tech add a true bias circuit for the output tubes. I think these tend to burn up the bias resistors if there isn't a true bias circuit installed. It seems that older tubes were much colder than tubes today, and putting new tubes in it tends to draw more power through the bias resistors, overheating them. I'm fairly technical, I've built and repaired a lot of stuff, but I have a pretty dodgy record of success with tube amps in particular. The Silvertone is blowing fuses, where would you start with that symptom? I've heard maybe a lot of these old 1484 will blow output transformers. Are bias resistors a common failure in old high voltage amps as well? I really could just use a crash course in tube amp debugging. I've got two dead amps right now. I'd pull all the tubes and see if it still blows a fuse first. That'll tell you a lot about what's happening. The bias resistors and/or B+ resistors failing are common in older amps that don't have adjustable bias. Back in the day, the tubes ran a lot colder and pulled less current. The bias was set for a particular range of tubes. Now we have tubes that pull much more current and can overheat the bias resistors and/or the B+ resistors. The biggest thing is to find a schematic of the amps. You're only going to spin in circles if you don't know what you're looking at. Generally start at the power supply and work outwards, checking all voltages at any place you can find to make sure they are within 10% or so. If they aren't, investigate around that part of the circuit. The other option is to input a signal and trace the signal through the amp until it dies. Usually I use a 1Khz tone and set my DMM to AC volts(I'll change the range as I work through the amp to account for the gain changes). I'll trace through until the signal cuts out. |
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Post by svart on Dec 5, 2014 21:35:32 GMT -6
I'm using my Silvertone this evening on a one-take type situation for a country-ish artist. They came inn with a Princeton, and the Silvertone ate it for breakfast.
I'll have a video up soon.
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Post by svart on Dec 6, 2014 21:42:17 GMT -6
Here's one of the tunes we recorded with the silvertone. Gefell M930/1272 on vocals Silvertone through a 2x12, R121/312 on the V30 speaker, dead center of the dust cap D6 on kick drum through 312 Johnkenn |
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Post by jimwilliams on Dec 10, 2014 10:10:25 GMT -6
The most fun I had with those was back when they were new in the mid 1960's. Someone took the speaker which had an AC plug on it and plugged it into the wall.
Ever heard 60 hz at ear splitting volumes before speaker failure?
I have, it was great.
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Post by Guitar on Dec 10, 2014 17:14:59 GMT -6
The most fun I had with those was back when they were new in the mid 1960's. Someone took the speaker which had an AC plug on it and plugged it into the wall. Ever heard 60 hz at ear splitting volumes before speaker failure? I have, it was great. That's really funny JW! I was just thinking to myself, "I wonder what would happen if I plugged a speaker directly into the wall." Now I kind of know, haha. |
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Post by Guitar on May 26, 2016 14:27:54 GMT -6
I just checked eBay and the price has gone up on these a lot since the early 2000s. Still need to get mine fixed. :-( svart assuming it's still blowing fuses with the tubes all pulled out, what would you be looking at then? |
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Post by svart on May 26, 2016 14:36:25 GMT -6
I just checked eBay and the price has gone up on these a lot since the early 2000s. Still need to get mine fixed. :-( svart assuming it's still blowing fuses with the tubes all pulled out, what would you be looking at then? Shorted power transformer, shorted/bad diodes, frayed wires, wrong fuse values all come to mind for things to check. |
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Post by Guitar on May 26, 2016 14:59:45 GMT -6
I just checked eBay and the price has gone up on these a lot since the early 2000s. Still need to get mine fixed. :-( svart assuming it's still blowing fuses with the tubes all pulled out, what would you be looking at then? Shorted power transformer, shorted/bad diodes, frayed wires, wrong fuse values all come to mind for things to check. Thanks!! |
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Post by sean on May 30, 2016 8:28:21 GMT -6
I had a 1482 I never should have sold. Great little amps, really unique tremolo. They had a sound.
A lot of guys in Nashville carry 1484 heads and plug them into various cabinets. I love those things too. I'll snag one some day when one comes up cheap again.
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Post by Guitar on May 30, 2016 9:31:45 GMT -6
I'm noting this big upward price trend on a lot of great older gear that used to be cheap...it's kind of bumming me out. I suppose that's the way she goes.
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