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FDP Forum / Amp Mods, Repairs, and Projects / Is there any downside in using a speaker
(This message was last edited by pdf64 at 04:05 PM, May 5th, 2012)
FDP Forum / Amp Mods, Repairs, and Projects / Is there any downside in using a speaker
Telequest
Contributing Member
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Middle Of Nowhere
I got blisters on me fingers!May 4th, 2012 09:29 PM Edit Profile Print Topic Search
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that is double the suggested impedance of a tube guitar amp?
(other than the obvious half power output)
In other words, a 16 ohm speaker in a combo that came came with/suggests an 8 ohm speaker.
jhawkr
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USA
Final Four!May 5th, 2012 05:30 AM Edit Profile Print Topic Search
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It won't hurt your amp but it will definitely lose volume, sparkle, definition. You are basically constipating your amp.
pdf64
UKMay 5th, 2012 11:19 AM Edit Profile Print Topic Search
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Please specify the amp, as responses of a generic nature won't be appropriate in every instance.
Given that, it won't halve the power output, though it will reduce a little. This is due to the high output impedance of tube amps.
The tone may change a little.
Perhaps most significantly, the screen grid dissipation will be comparitively higher at high power levels, this being a spec which is generally exceeded in most amps already.
The likelihood of there being damaging flyback voltages at the output transformer primary circuit, at high power levels, increases. The significance of this will vary according the amp.
Pete.
Telequest
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Middle Of Nowhere
I got blisters on me fingers!May 5th, 2012 01:58 PM Edit Profile Print Topic Search
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The amp in question is a Brit (Marshall made era) AC15.
Came with an 8 ohm 12" Celestion Greenback.
I have 3 interesting 16 ohm speakers. A Celestion Blue, a Scumback H-whatever and a Weber Alnico.
Telequest
Contributing Member
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Middle Of Nowhere
I got blisters on me fingers!May 5th, 2012 02:22 PM Edit Profile Print Topic Search
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Let me add, that I have tried all 3 of the aforementioned 16 ohmers and of those 3 and the 8 ohm Greeneback....gotta say that I prefer the Scumback.
pdf64
UKMay 5th, 2012 03:38 PM Edit Profile Print Topic Search
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With that amp, which has no negative feedback loop, the tone change from doubling the load will be at their max.
So a 16 ohm greenback would result in a different tone from the amp, compared to your 8 ohm one; so not comparing like with like.
Also I'd be concerned about flyback (when overdriving it), as the 8k output transformer primary impedance will double to 16k, which is quite high.
Are you sure that there isn't a 16 ohm tap tucked away somewhere; using that would be far better.
Pete.
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