Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: jackplug1 on April 08, 2023, 12:29:29 pm
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Can this be done continuously without break for 12 hours at a stretch over 3-4 days?
(at 6.5v into 8 ohms impedance or 6.5v dc resistance - about 6.5 watts)
Or do need to let it cool down in intervals of 2 hours on 2 hours off.
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Well I confess that I would not do this. But I'm old school and just break in speakers by using the amp.
That said, if you limit the current through the transformer by using an appropriate load it (the transformer) should not overheat, and thus no reason not to let it rip.
If I did this, I would check the current in circuit just to be sure that your 8ohm speaker really is that -- it may not be at 60Hz.
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Can this be done continuously without break....Or do need to let it cool down...
What is the speaker? A 2 Watt three inch? Or a 150 Watt Fifteen? HiFi or Guitar?
Personally: softening 25W Twelves with 60Hz is very annoying.
And IMHO you want ALL peak-levels and frequencies in approximately the intended sound-shape. I used to break-in classroom speakers with a CD of mixed Bach and Rachmaninoff; my own speakers with Les Paul, Neil Young, Live Dead (on LP!), and RedNex.
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i always used a solid state power amp (like the 40w kustom i never used for anything else) with an mp3 player hooked up gently moving the cone for a weekend. much more pleasant to listen to than HUMMMMMM (not to mention that 60hz plus the high pitch ~C# note that i constantly hear is not a harmonious interval)
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I use an amp with bias wiggle tremolo. Turn the volume down and the trem up
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It's a 8 ohm 50 watt 15 inch guitar speaker of 6.5R dc resistance fed by 6.5 vac 50HZ
The speaker is not in a cabinet so it is not too loud as the sound waves cancel out
The current flow is 0.8 amp tested with a clamp meter.
As it's 50watt rating, does that mean it should accept anything up the 25 watts rms without a problem
so a constant 5.2 watts rms at 50hz for many hours will not damage it as it is a fraction of it's claimed rating?
However is 6.5vac going to be effective as it's all I have available, I think maybe 12 vac would be better?
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so a constant 5.2 watts rms at 50hz for many hours will not damage it as it is a fraction of it's claimed rating?
Should be fine.
is 6.5vac going to be effective as it's all I have available, I think maybe 12 vac would be better?
If that is what you have, well then . . . 12VAC better? Maybe, maybe not. I'm not aware of testing what power is best for breaking in speakers (though very likely someone on this forum does know).
I personally just use the speaker and let it break in naturally. Works for me, but everyone has their own method (and I don't think there is a single right way).
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Well it's humming away in the wardrobe in the spare room, we'll see what happens!