Is my speaker ok to use with my tube amp?? - diyAudio
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Old 27th April 2014, 02:30 PM   #1
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Default Is my speaker ok to use with my tube amp??

I have a 5 watt valve head for my Guitar that I recently bought, and am saving up to buy a good speaker. For now, I want to try it out, but all I have is the 6 inch speaker from my old Laney solid state combo. I measured the resistance across the two terminals of the speaker, and it read 4.7 ohms. Is this ok to plug into the 4 ohm tap of my amp, or should I use the 8 ohm tap, or neither?
I know that its generally not a good idea to have a higher impedance speaker than the socket, and it might kill the OT, but seem as it is 0.7 volts, I have no idea.
Thanks in advance!

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Old 27th April 2014, 05:56 PM   #2
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Plug in boldly.....don't worry, it's OK.
Projects: OTL-OCL 6AS7 Gen. Electric, SEs 2A3 RCA, 300B JJ, 6S4S, 4P1L, EL11 Telefunken, 6AS7 RCA, 6S33S, 6S41S, 6S19P, E84L Siemens, E236L Telefunken, headphone ampl. OTL Loftin White 6AS7 RCA,... PPs 6005 Gen. Electric, EL34 Mullard, 6L6....

Last edited by azazello; 27th April 2014 at 06:03 PM.
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Old 27th April 2014, 06:33 PM   #3
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It will be fine, but 4.7 ohms resistance is about what we expect from an 8 ohm speaker. So it would be better to plug in to the 8 ohm tap.
(The nominal 8 ohms of a speaker is a 'reactive impedance' which includes the coil inductance etc. as well as the resistance.)
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Old 27th April 2014, 06:39 PM   #4
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Thanks guys. Malcolm that makes sense now. Cheers.

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Old 27th April 2014, 06:52 PM   #5
kevinkr is offline kevinkr  United States
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:Cop: Since this is guitar amplifier related this thread really belongs in the Instruments & Amps forum where I'll move it.
"To argue with a person who has renounced the use of reason is like administering medicine to the dead." - Thomas Paine
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Old 27th April 2014, 06:56 PM   #6
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Ok that's fine. Thanks
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