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Help finding OS X Tiger or Leopard for PPC. So things like amp techs are difficult to find. If one were easily available, it would be there already Unfortunately for me (at least in the context of this situation), I live in Naples, Italy right now. I can upload a video of me tweaking with knobs and with the audible noise, but I don't know that that will give you much more information that I've typed. But I was there for those and it always came back on without the hum. There have been a few instances of other band members or tech apprentices accidentally unplugging the amp and then plugging it in, while it was already on. As far as I know, there was no particular incident that caused the hum to start, however, it was first noticed while the amp was living in a shared practice space (though no one uses my equipment).

Usage during that time has been moderate. But up until a month ago, I'd never had any problems. So for the last year, I've been running at the correct voltage, but not the correct frequency. Up until recently, I never even registered the fact that it only transforms the voltage, not the frequency. I live overseas right now, and had my amp running through a 2000W transformer. Amp is a US model, expecting '120V ~ 60 Hz / 375 Watts'. I've done some tube-pulling experiments: When pulled, V1 - hum V2 - hum V3 - hum V4 - NO HUM V5&V8 - V6 and V7 still in, hum V6&V7 - V5 and V8 still in, hum V5-V8 - when pulled simultaneously, NO HUM After comparing to some online clips, the hum seems to be at 50hz. (as of now, I've reverted to the old tubes for fear of causing damage to the new ones). Guitar signal from the front input still makes it through the amp as it did previously, but it now has the added hum.Īt first, I thought it might just be time for a tube swap, so I obtained a complete lineup of new tubes (thanks Marty!), enough pre-amp tubes for tinkering and 4x output tubes. The hum appears from all 3 output jacks and is also present in the line-out. The hum level on the clean channel is marginally lower. All other controls have no effect whatsoever (this includes line level of efx loop, fx mix, reverb, eq stack, gain, and volume). The hum is present on all 3 channels and is directly affected by Output Mute, VPR, Deep, and Presence controls. About a month ago, the amp developed a hum. I have a ' TSL 100, currently connected to a JCM 900 1936 2x12 cab.

BUNGIE TROD RIDDIM ZIPPYSHARE DOWNLOADS HOW TO

Does anyone have the correct diagram on how to plug up the output transformer or maybe i need to be looking somewhere else.Īlso forgot to note i did change the output tubes and also i have used the return loop on the effects as the input to make sure its not the front drive board.-Thanx Bill. Now the schematic does not show colors or the extra taps on the transformer so i am not sure everything is in the right place. Now i am thinking the tech had put the wires back on the output transformer incorrectly.

The most i can get is 2.8v across the 8ohm load. Well the amp fires up fine, bias is good, and i get a clean output on the scope with a 8ohm load and 1khz for the input.īut the problems is i am not getting enough output.

Once i figured out what he had done i replaced the opamps and a bad ECC83 (V4) and then proceeded to check and make sure the wire harnesses were in there correct sockets. What he had done was he plugged up the secondary of the xfomer that supplies the +/- 15v incorrectly. I received the amp with all the opamps fried. Hi guy's I have DSL50 here for repair that i had acquired from another technician that took a shot at repairing this amp. Sup guys, I have had my JCM2000 DSL50 for about few years now and its time for a new set of tubes. What tubes for Marshall JCM2000 DSL 50?, 09:05 AM.

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