Repairing the Lee Jackson GP-1000 | Weird Gear Broke
Вставка
- Опубліковано 8 жов 2023
- Welcome to weird gear broke, a spin-off of Weird Gear Reviews.
And again I got a Lee Jackson GP-1000 on my desk for repair. As I mentioned in the first video about that amp, it likes to fail from time to time. And this time it was at the biggest venue this year.
Let's open it up and see what broke. The GP1000 blows fuses, wont start up and there is no light on.
I take you with me on the journey of the insanity of playing that thing constantly live and then having it every year on the desk for repair. This amp is not that hard to fix if you know some of the basics in electronics and amps. This is how to fix it.
I hope this is some kind of help to you.
See you in a few days.
_____________________________________
Make sure to follow me on my socials (or dont):
Instagram: dignityoffi...
I got facebook: / dignity-112140101306461
And on...eh...tiktok...i guess? (I'm not that often there): www.tiktok.com/@dignity.offic... - Розваги
Erinnert mich stark an "1000 wege ins Gras zu beißen"... das ist dann wohl nr.1001 wenn du leuchtest nicht die Glühbirne! ⚡🤣
Klasse Video... Rock on mein lieber!🖤🤘🏻❤️🔥🤘🏻🖤
(And pleace more from the live...🎶😈🎶)
thank you so much! i have a lot of phone videos from people, maybe i'll do some shorts with them in between videos. might be a good idea!
@@Dignityofficial_ Oh hell yeah... das klingt nach ner sehr guten Idee, fänd ich echt supi! 👍🏻💜
Stupid question time:
what if you made an identical case but add some ventilation? Small intake and exhaust fans front and back: one where the "perfect connection" logo is and another next to the gain footswitch? This way there would be a bit of airflow over these diodes and transformer, but have no/negligible effect on the tubes (I understand that tubes need to be warm in order to operate optimally/properly?).
That is not a stupid question.
It's something I was thinking about too, ventilating the amp.
The tubes are outside the housing anyway, it needs to warm up to work, but you don't have to keep it warm or cool the tubes, that's what the heater circuit is for.
I'm not sure though if that would improve anything. Lee Jackson absolutely knew what he was doing and probably also thought and tested if it needs any ventilation system and decided not to. It's not a very packed amp and even decided to only put 85°C caps in there instead of 105°C So the temperature is not that high in general inside the housing.
I think it's really just the fact that those preamps are 35 years old and the components die over time and get less heat resistant, especially in live environments. Instead of thinking about reducing the temperature, it's probably more advisable to service the amp, switch out components that are dying and that cause the deaths in advance, so it won't fail. I'm playing those preamps now for about 6 years constantly live and always something else broke, never the same thing. So I don't have enough data to narrow it down to a few components to definitely say you need to swap this or that to make it reliable.
Also live shows are are different strain on amps, first running time and second voltages. Usually you want 220-240V constantly. Sadly enough due to all the gear and lights that's on stage, you have sudden voltage drops.
This particular evening we had voltage drops up to 200V which is very low and already dangerous for gear. Same consumer and less voltage means that the consumer draws more amps to work, so more current flows, this results in way more heat and strain on electrical components, which they are not intended for.
So in general I believe, that it's a combination of voltage drops and heat that is straining on the amps live.
That's also why I said that I don't think it will actually fail in home environments that often, because usually there are no high voltage drop and if so, they don't last for hours that could damage the preamp.
So no, I don't think ventilation fixes the problem, steady voltages live and swapping out dying component before they die would fix the problem.
Should make some NAM (Neural Amp Modeler) captures of it! Then it'll be immortalized and always ready-to-go. :D
I think there are some out there already!
I wonder if they programmed the fails too...
Bro, you basically just passed amp tech exam. Methodical and scientific approach. If playing guitar doesn’t pan out as your long term career, you could set up shop.
Yeah someone already has put up a pretty great Alexi rig for Neural Amp Modeler. Sounds great, just be aware that it’s “loud” as fuck.
Take care until next video.
Thank you so much!
Well, I'm in a very rural area in the middle of nowhere, so I don't know if any kind of shop would pay my bills.
I don't expect either music or this UA-cam thing to be something that would pay any of my bills. All the live shows that I do is basically to be able to afford all the gear, like reinvestment. Sure, would be awesome to do anything with music for a living, either working on guitars, amps or music all the time. But I'm also grateful to be able to put here and there some knowledge out in the open world and put a smile here and there on a face. That's all I ask for.
I heard of that modeling thing, but I'm not really a guy that works with technology and modeling, I guess it's just not for me really. But I love that it's available and in the last year's it started to really get somewhere, since you get really good sounds out of very little money and you don't have to store so mich gear everywhere.
Take care too!