Author Topic: Power problems (Read 145 times)

dathkasparov · « **on:** March 23, 2006, 07:51:28 PM »

I just got a randall rh300 a monster 300 watt head,
the problem when i crank up the volume past, well lets say volume is at 8 and level at 3 the power cuts out but if i turn it down a little its fine what the heck is going on. please help me

keavin · « **Reply #1 on:** March 24, 2006, 04:57:38 AM »

I had one of those 'POWERFUL' f#ckers & mine did the same thing,,,,,,, so i sold it.......sell it!!!

adriaan · « **Reply #2 on:** March 24, 2006, 05:43:30 AM »

Look at the user manual for recommended settings, or check the Randall site.

At 300 watt, you would expect to see a at least two volume-related pots, one for the pre-amp (usually labeled Gain or Level) and one for the power amp (Master). If this is a guitar amp, you might have a third pot for Drive or something similar.

Keep the master low (perhaps 2 or 3) and adjust the pre-amp to get the sound right. Now you can turn up the master to the point where you have the volume you need. If you need to go as high as 8 on the master, then you should look at the speakers - impedance mismatch between amp and cab(s).

Or you might ask your bandmates - gently - to turn down their volume. No need to go deaf if you're at all interested in music.

If you're trying to get high levels of output with a high setting for the master volume, but a low setting for the pre-amp, then the amp won't like it - it might well result in the amp cutting out on you.

David Houck · « **Reply #3 on:** March 25, 2006, 10:50:14 AM »

Two threads with the same initial post. Well, I just posted a response to the other thread. If I get around to it, I might move it over here and delete the other thread.

dathkasparov · « **Reply #4 on:** March 25, 2006, 09:38:02 PM »

The Randall rh300 is new and is a hybrid amp with a 12AT7 tube it has both 4&8 ohm outputs i use the 8ohm output,the cab is a 8 ohm 340watt rms 680 max 4x12.
my cables are good so is there a problem with this setup is it possible that it drains so much electricity that it cuts out and when i say cuts out its not the sound goes down a bit but the power goes out altogether for a second then comes back on.

2400wattman · « **Reply #5 on:** March 26, 2006, 11:46:40 AM »

Does this happen in your home or at a gig or both? If it's at home, check to see if you are plugged into an outlet that has a dimmer switch running it, if so plug it in somewhere else. You will kill that thing. Otherwise, I'd have to agree w/ Keavin. Get out from under that amp before it costs you more money in the long run.

keith_h · « **Reply #6 on:** March 26, 2006, 02:13:49 PM »

It sounds like a thermal condition or overload is shutting down the amp. You said it is brand new. If it still under warranty I would take it back in for service. This could be a could be defective head, setup or design problem. The service folks should be able to give you a good idea of which. After hearing their reponse you should have enough information to make a decision on what to do.

keith