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Can I damage 2x12 Alnico Blues with JTM45?

omarxx

Member
Messages
91
Will I damage my Celestion Alnico Blue speakers in a 2x12 16 ohm cabinet by powering them with a JTM45 that has been upgraded with Mercury Magnetics transformers and KT66 tubes? Thanks. :dunno

- omar
 

slider313

Gold Supporting Member
Messages
8,262
Sure can. The blue is a 15 watt speaker. If you turn that amp up past "2" they won't last very long.
 

Brewmaster

Member
Messages
189
Yep, sure will.

If you can swing the $$$ get Celestion Golds. I run a JTM45 into a 2x12 loaded with a Gold and a G12H. That is my current tonal Nirvana which may not be yours.
 

silvertone

Member
Messages
176
I've used mine with blues for the past 5 years, and cranked at times. The speakers are fine. In fact, I think they've still not completely broken in.
It might depend on your playing style though....
 

billstets

Member
Messages
892
I'm pretty sure a JTM45 is 30-35 watts, but that's clean. It will put out probably 45-55 watts cranked. Just like a JMP 50 watter, will put out 75 when cranked.
 

Roe

Member
Messages
7,963
they will last a while. how long depends on b+, tubes, bias, playing style, amp settings, effects etc etc
 

Roe

Member
Messages
7,963
also, running a 8ohm load for the 16ohms output on the amp (or a 4 ohm load from the 8 ohm outut) will increase the power and blow the speakers faster
 

ben_allison

Member
Messages
3,044
I've read somewhere that they put out about 30 watts.

That's RMS, not peak. RMS can be as little as half of peak output.

This is why you typically want DOUBLE your amps wattage in speaker handling.

50 watt head goes on top of a 4x12 of Greenbacks.
100 watt head goes on top of a 4x12 of V30's.
 

dunara

Member
Messages
1,900
I have a JTM45 with KT66s, and a cabinet with 2 old ('70s) blues at 16ohms. I've dimed the amp once through that cabinet. It was starting to fart a bit on the low notes, so I turned it down and have never been back there - I have two other cabinets I can use, and now have a Weber mini-mass, so it's not really necessary.
One point - if the OT is tapped at 16 ohms, the rated output should be lower than 8 ohms, which is lower than 4 ohms etc. Anyone know the precise figures for each impedance setting?
 

WesKuhnley

Member
Messages
2,241
Why spend the dough on golds? try some weber's for about $200 per, or WGS AlNiCo's for $230 ish...The new WGS Blackhawk 100 is fantastic
 

amp boy

Member
Messages
2,471
Will you damage them....??
No, since yer in Texas.

Just bring them to Austin SpeakerWorks perhaps first.....might be cheaper than after the boom.

I say you want to play the amp.........so get some speakers for it.
can i get an ahmen....??
: )
 

rockon1

Platinum Supporting Member
Messages
13,201
also, running a 8ohm load for the 16ohms output on the amp (or a 4 ohm load from the 8 ohm outut) will increase the power and blow the speakers faster
An impedance mismatch either way with a tube amp will cause a reduction in power output. Bob
 

rockon1

Platinum Supporting Member
Messages
13,201
no, thats simply not correct in this case since the primary impedance is way high
Thats interesting. Ive been told many times that any mismatch will result in power loss with a tube amp. Bob
 

willhutch

Silver Supporting Member
Messages
1,907
There's a difference between "will damage" and "can damage". Clearly it's possible to hurt 15 watt speakers with a JTM45. How loud are you gonna play? You'll be fine as long as you don't push too hard. But of course, you never know where "too hard" is until you actually damage the speakers.
 




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