you and your AMP? ohms? PU height?

[yucancallmepatty]

so im playing through a 120 watt, all tube half stack,

 

and im running the cable from the head to the cab,

and it doesnt make any noise when i plug the cable in the INPUT jack, on the back of the cab.

but when i put it in the OUTPUT jack of the cab, it works.

 

whats wrong?

did manufacturing screw it up?

 

also, whats a standard height for pickups?

im playing a gibson special faded.

 

 

PS.

personal message me if you know about ohms.

ive googled it but i still dont under stand.

im hoping one of you can explain it.

 

my head is 8 and 16 compatible, it has the switch.

and my cab also has a 8 ohm stereo, and 16ohm mono.

which should i use?

is there a difference really?

 

and why does my cab have to jacks to plug into?

if i have my cab on stereo, are only 2 of the speakers working if

i plug only one jack from the head to the cab in?

so whats the extra jack for?

full stacks?

cause the head has 2 outs, so a external from the cab is unnecessary, no?

[yoda]

Try this page... I went to school for electronics and this explains it pretty well It is about car speakers, but ohm load for amps is all the same.

 

This one is good too.

 

and another

 

As for your cab not working on the input not sure. Did you buy it used? what kind is it? ..etc

[greg420blues]

Okie dokie ... first of all ... you sure you're not plugging into an effects loop? Just makes me wonder what an "input" jack is doing on the back panel of your amp. If I'm totally off-base, then just disregard me. But I'd check that. Your output would be for ... well ... your signal going to your cab, which is why you're getting sound.

 

AS FOR OHMS, here's what I know ... and keep in mind that I can never remember the trick about larger ohms going into smaller ohms or reverse so don't ask me about that ... hehehehe ... but generally speaking:

 

Most heads are at either 2, 4, 8 or 16.

Single 4x12 cabs are generally 16ohms

Running two 4x12's, then each one becomes 8ohms

 

You're splitting the signal coming out of the amp, and therefore you split the ohms in half.

 

If you want to run your cab in stereo, each side will be 8ohms. Flicking that stereo switch is like turning your 4x12 into two 2x12's ... so you'd run an 8ohm output into each side.

 

Hope that helps ...

[MikeRom]

Mabye the cab is set up for stereo too and the output jack is the correct jack to use for mono mode? If you don't have a manual for it check on line at the mfg web site. Should offer some insight.

[chongo]

so im playing through a 120 watt' date=' all tube half stack,

 

and im running the cable from the head to the cab,

and it doesnt make any noise when i plug the cable in the INPUT jack, on the back of the cab.

but when i put it in the OUTPUT jack of the cab, it works.

 

whats wrong?

did manufacturing screw it up?[/quote']

 

You should have your cabinet switched to Mono (since you're not running two power amps into it) always. What amp and cab is this, and can you get a photo of the input area of the cab?

 

also, whats a standard height for pickups?

im playing a gibson special faded.

 

press down the strings at the highest fret (22nd) on your guitar. Measure from the bottom of the strings to the top of the screws. Start with a 5/32nd" distance. You probably never want to move the pickups any closer than 1/16th".

 

personal message me if you know about ohms.

ive googled it but i still dont under stand.

im hoping one of you can explain it.

 

Ohms represents an average resistance load that a speaker (or a bunch of speakers in a cabinet) presents to your amplifier. Tube amps in particular need to have a load to work with (never turn on your tube amp and strum chords with your speakers NOT plugged in. Damage can result). Each individual speaker is rated for a given resistance and whole cabinets are similarly rated. You can combine groups of speakers in series and in parallel to increase or decrease the resistance, depending on whether you wire the speakers to each other in series or in parallel.

 

You generally want the resistance load to match, between cabinet and head.

 

my head is 8 and 16 compatible, it has the switch.

and my cab also has a 8 ohm stereo, and 16ohm mono.

which should i use?

is there a difference really?

 

There's a difference -- the amp will put out a different amount of power to different resistance loads. If you're using your cabinet in mono (16 ohm) then you should switch the amp to 16 ohm as well.

 

and why does my cab have to jacks to plug into?

if i have my cab on stereo, are only 2 of the speakers working if

i plug only one jack from the head to the cab in?

so whats the extra jack for?

full stacks?

cause the head has 2 outs, so a external from the cab is unnecessary, no?

 

It depends on the cabinet. Some stereo cabinets have two inputs, so that you can switch the cabinet to stereo and run a stereo amplifier into the cabinet. One side of the amplfier will run two speakers, the other side will run the two other speakers. You should check with the amp manufacturer about this (there's sometimes a FAQ or a .pdf file on the manufacturer's website under "service" or "support" where you can get more information...)

 

If your cabinet has an "output", then it could be allowing you to plug the second cabinet (of a full stack) into that jack rather than requiring you to run a line from the bottom cabinet all the way to the amp. And yeah, you're right, if you have two outputs on the amp head, you really don't need the cabinet-to-cabinet option.