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Peavey 60/60 power amp

J

Jaswine85

Oct 19, 2002
65
1
Jacksonville, Fl
#1
A friend is letting me borrow his Peavey 60/60 power amp for a while. This amp has two channels/inputs, but i only have one speaker cabinet (that works!).

The manual says the amp is 65 with one side driven and 60 with both. Does this mean it is safe to use just one channel, or must both be plugged into cabs? If the a cabinet is rated to handle it, can one just put both channel outs into the same cabinet?

The manual is attached.
Ive never owned a tube amp so youll have to endure my newbness - help is really appreciated.

thx

j
 

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#5
Jaswine, make sure the input for the channel you're not using is turned all the way down, and to be absolutely sure that no signal gets to that half of the amp, I'd also insert a shorted 1/4-inch plug into the input (get an old or unused plug and wire the two terminals together--this ensures that no signal can pass through that side of the amp). Without the shorted plug, you run the risk that the unused channel could accidentally get turned up during use, and with no cabinet attached, the output transformer for that channel will self-destruct.
 
#7
Thanks for the help all.

Fdeck...i was wondering that myself. Currently i guess i have to get my broken 15" ampeg spkr replaced & use two cabs to use this amplifier and have it loud.

I dont have a standalone preamp - just the pre out on an ampeg B5R. Since theres only one preamp out, is the B5R's pre-master transformer balanced line out sufficient to run into the second channel in the Peavey? If not il have to use a splitter and split my bass to my rack Pod as well as the Ampeg.

Also ive been reading the talkbass archives but if anyone could like a comprehensive guide to tube amp operation that would make me day!

j
 
#8
bobcruz said:
insert a shorted 1/4-inch plug into the input (get an old or unused plug and wire the two terminals together--this ensures that no signal can pass through that side of the amp).
Click to expand...

shorted as in shorted out i assume? Please elaborate on the wiring. I googled "wire terminal" and i cant even figure out exactly what one is let alone how to rewire it so its correctly "broken." Must it be a speaker cable or anything (eg. instr. cable) just so theres something there?
 
#11
Jaswine85 said:
shorted as in shorted out i assume? Please elaborate on the wiring. I googled "wire terminal" and i cant even figure out exactly what one is let alone how to rewire it so its correctly "broken." Must it be a speaker cable or anything (eg. instr. cable) just so theres something there?
Click to expand...
Any regular 1/4-inch plug will have two terminals inside the case, one that connects to the tip and one that connects to the sleeve. You can solder a wire connecting the two terminals to short it out. An easier method would be to cut the plug off the end of an old broken cable (instrument or speaker cable doesn't matter). When you open up the case, two wires are already soldered to the terminals and you just need to strip the insulation off them and twist them together, then put the case back together. An old speaker cable would be a little easier to deal with since the wires are fatter and you don't have to deal with stripping the insulation away from the braided wire shield that's used in an instrument cable, but either would work.
 
#13
blendermassacre said:
I think he meant there isn't a bridged out, however couldn't you use a Y speaker cable using 2 outs to a single cab?
Click to expand...

Absolutely not. One amp will be trying to drive the others output. Not a good idea! No tube amp should be run with out a load on the output - period. If you pull the output tubes from the unused channel you will be fine.

Stereo tube amps can be bridged but it's a little complicated to set up.

Paul
 
#14
BassmanPaul said:
Absolutely not. One amp will be trying to drive the others output. Not a good idea! No tube amp should be run with out a load on the output - period. If you pull the output tubes from the unused channel you will be fine.

Stereo tube amps can be bridged but it's a little complicated to set up.

Paul
Click to expand...

Just making sure. I didn't think it was a good idea, but I figured it was worth the question
 
#15
Or just get a 4-16 ohm resistor from a local electronics store... Say a 10 watt. Should run you all of 1 dollar. Hang that on the output of the unused channel and make sure nothing else is plugged in and the vol to that chan is off.

I used to have some nice light bulbs I could plug into the backs of amps. Seems they were a little too fragile.
 
#17
This particular amp isn't set up to be bridged like some of the other Peavey classic ones. You could probably have it modified but that's probably not worth the $. The 50/50 is and I think there is a 100/100 that is. You should be able to find the old manuals on the Peavey site.

You never want to take a power amp's out put it anywhere other than a speaker cab input. That includes combining it with other amp outputs or sending it in to another amp. Bad things will happen!

A line out from a pre-amp, which is what most bass heads have, is exactly what you should use. Usually, there are options to take a line out either pre or post eq.

I've considered getting one of these to play with either for stereo effects or just to supplement my main rig but have never gotten around to it. I'd be interested in your review once you sort things out.

-dunc
 
#18
^^My ampeg B5R's preamp out is being used for one channel of the peavey. Since theres only one preamp out, is the B5R's pre-master transformer balanced/unbal line out sufficient to run into the second channel in the Peavey?

I would just try it but im still pretty wary of plugging things in anywhere im not quite sure about.
 
#19
bobcruz said:
You can solder a wire connecting the two terminals to short it out. An easier method would be to cut the plug off the end of an old broken cable (instrument or speaker cable doesn't matter). When you open up the case, two wires are already soldered to the terminals and you just need to strip the insulation off them and twist them together, then put the case back together.
Click to expand...

I went to radio shack to pick up a solder, and asked a salesman (who said he knew what he was talking about in ref to amps) about the above quote who told me:

If i cut off the plug of a cable, twist the wires together, and plug the other end into my input, its still gonna blow if the channel vol. increases. He said just tape the volume down.

Could i please get some clarification on whats happening in the cable? How is no signal able to get into the input even with the plug cut off and wires twisted?
- im assuming you/yall know best but that guyhaving just said ill destroy my channel by doing the above has got me a bit scared.

thx for the :help: !
 
#20
Jaswine85 said:
^^My ampeg B5R's preamp out is being used for one channel of the peavey. Since theres only one preamp out, is the B5R's pre-master transformer balanced/unbal line out sufficient to run into the second channel in the Peavey?

I would just try it but im still pretty wary of plugging things in anywhere im not quite sure about.
Click to expand...

You should be able to get a Y-cable and take the preamp out into both of the Peavey inputs. I'm not an expert with what might happen with signal loss but I don't think it would be a problem. Certainly easier and safer to try that than cutting cables etc...
 

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