Yeah I'm definitely going to bring my meter and a schematic next time I visit my practice space! I'm an electrician by trade but I do commercial work so I very rarely work with electronics but I understand the principles.

You really think it's overheating? I've tried touching the heatsink and Ive verified that the fan is working it really doesn't feel too hot but I'll try pulling it from the box anyway. I've modified a lot of Randall head boxes to more efficiently dissipate heat in my days as a SS amp enthusiast but this is my first G3 series amp so I'm somewhat feeling it out at this point but this particular amp seems to be well vented, has a functioning fan, and so far the heatsink has seemed cool but I'll put a thermometer in it and try the house fan idea. Funny thing about that, I use house fans to diagnose overheating variable frequency fan speed drives at work all the time but those are usually so hot it's very easy to tell...

I forgot to mention that I'm quite familiar with running high wattage amps into low ohmage cabinets and the overheating problems that occur with randalls specifically. This seems to be a non-heat related issue...

I also have an rh200 and it used to cut out when it overheated (consistently at 4ohms) so I removed the front panel and cut the cloth out then I removed the rear panel and cut a large \________/ pattern out of it to allow safe heat dissipation and that has seemed to cure it so far however I'm going to add Marshall style vents to the top as well as an extra measure. Typically overheating is the problem with most randalls in general and if you can modify your head box to allow for better heat dissipation it helps dramatically.

The ampeg vh-140c and vh-150 are two amazing sounding amps, suffocation, eyehategod, and assück all used them and they sound good straight in with no maximizer or eq units necessary. Also try Randall out they make a ton of high gain ss amps that sound great. I've had a ton of high gain tube amps and I can tell you, for death metal or thrash or grind ss is the way to go.

I have a Randall rh300 G3 that works perfectly fine until I bring the volume up past about 7 on the level and 4-5 on the master. I hear that these amps tend to overheat but it doesn't feel very hot and as soon as I bring the volume down a bit it seems to return to normal ( although somewhat quiet ) operation.

Any suggestions? Should I just bring it to my tech? I'm pretty good with electronic repairs so if this can be cured somewhat reasonably I'd like to know how!

i play grind/death metal and i have an ampeg vh-150 and an ampeg ss-150 that i run either into two marshall 1960 cabs or stereo into one cab with an a/b/y. ive been really curious about a crate gx-130c and was wondering if anybody here has one or has played one before. i hear they use the same preamp but ive never been able to confirm it...

if its anything like my ampegs i'd like to know because itll be next on my acquisitions list for sure!
by the way, i know about the gt3500 and the gtx3500 and the vtx series. i dont like those very much but from what i understand the gx-130c is a MUCH closer copy of the ampeg circuit.