Dude.

irutsun · Posted: Sat Apr 02, 2005 7:40 am Post subject: Dude.

Hi - This is my second time writing this as the bloody preview button didn't work!

I'm running a Peavy Millenium bass through an old Carlsboro Cobra Twin 90.

I used to have the problem of it cutting out when I pulled out something reasonably loud, and to rectify this I used to have to fiddle with the loose fuse on the back, or with the power cable. So I thought it sounded like a loose connection.

I opened up the amplifier, and tightened the fuse. Checked all the connections and looked for any burnt out components. Everything looks fine.

So I put it together, tried it out, and nothing. I turned up everything; the volume, the gain, the treble, the bass and all I get is a little peep out of it when I try. It plays a note, but super quietly.

And that's my story, again!

Any advice?

Cheers.
Karlos.

bcf717 · Posted: Sat Apr 02, 2005 12:34 pm Post subject:

Is it a tube amp? I had a similar problem years (decades) ago when I had a tube half stack. After checking and re-checking the usual suspects, like fuse and power connections, it turned out to be a bad tube. There was no discoloration or anything to indicate it's failing. In my last ditch effort of desperation I went out and bought all new tubes for it. After replacing them all, it worked. To this day I still have no idea which was the bad tube. Sometimes, just because they light, doesn't mean they're doing what they're supposed to be doing. Good luck.
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....ain't happy unless the airport calls to complain about the noise......

irutsun · Posted: Sat Apr 02, 2005 12:46 pm Post subject:

It's not a tube amp to my knowledge.
This is a silly question, but what's the difference?

bcf717 · Posted: Sun Apr 03, 2005 8:47 am Post subject:

If it was a tube amp, you'd see them.... they resemble light bulbs and plug in using pins rather than screw in. Way back, before solid state, tubes were the only tech for such things, like tv's and even radios. As solid state progressed, tubes began being used less and less. The tubes needed to 'warm-up' a few minutes to work at peak performance. They are still used in some amps today along with solid state tech in sort of a combination of tech. A lot of players feel the tube gives a warmer tone, but in all honesty I think the tubeless amps have come a long way and I don't find that much difference. It's just my opinion and I'm sure others will be quick to argue tone differences.

Being yours doesn't have tubes, the problem could be anything -- from a bad resistor, to a shot volume pot. Unfortunately, unless you have the knowledge and electrical testing equipment, there is little you can do except take it to a pro. Usually tv repair shops can handle the task of diagnosing where the problem component is. They can test for resistance and electrical flow and stuff like that, and may be cheaper than going to someone who specializes in amps.
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....ain't happy unless the airport calls to complain about the noise......

irutsun · Posted: Sun Apr 03, 2005 9:06 am Post subject:

Thanks alot for that.
I guess I'll have to lug it down the road at some stage!

bcf717 · Posted: Sun Apr 03, 2005 3:24 pm Post subject:

Good luck. Let's hope it's something easy and simple, like a bad resistor. Very Happy

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....ain't happy unless the airport calls to complain about the noise......