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Dirty-South Blues Harp forum: wail on! >
Blackheart Little Giant Question
Blackheart Little Giant Question
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LIP RIPPER
380 posts
Feb 01, 2011
11:04 AM
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I just picked one of these on ebay. I noticed that the speaker outputs have two 4ohm and two 8ohm jacks and one 16ohm. So, if I can plug two 4 or 8ohm speakers in at the same time can I plug a speaker into the 16ohm output and another in one of the 4 or 8ohm outputs? Same question goes for the Epi valve junior.
LR
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LittleJoeSamson
476 posts
Feb 01, 2011
12:09 PM
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NO !
One 16 ohm speaker from the 16 output.
One 8 ohm from one 8 output.
One 4 ohm from one 4 output.
Two 16 ohm in series from one 8 output ( daisy-chain )
Two 16 ohm from individual 8 outputs.
Four 16 ohm from one 4 output in series.
Four 16 ohm from two 4 ohm ( 2X2 )
Two 8 ohm in series from one 4 output.
Two 8 ohm from individual 4 outputs.
Blackheart should provide a manual if you ask.
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LIP RIPPER
381 posts
Feb 01, 2011
12:33 PM
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Thank you. I was able to click and save a pdf file of the owners manual.
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5F6H
507 posts
Feb 01, 2011
12:36 PM
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OK, this isn't as simple as you anticipate, simple answer is "NO" (do not use 2x4ohm cabs in ANY output jack, do not use the 4ohm output at the same time as the 8 or 16ohm outputs).
If you want slightly more complex & trust yourself not to blow up your amp, there's more...
The Little Giant has 3 output taps on the output transformer, divide into 5 output jacks...
It has one 4ohm transformer tap (total load) connected to 2x "4ohm" jacks. This means that you can use 2x8ohm speakers in parallel (ohmage is halved), or one 4ohm speaker. Between these 2x 4ohm jacks, the amp doesn't care whether you use one or both, or whatever combination you use AS LONG AS the total load applied is 4ohms. You cannot use 2x4ohm speakers, or cabs in parallel because the amp will now see 2ohms total load. You could use 2x4ohm speakers wired in series in an 8ohm cab, but these would be plugged into the 8ohm jack, not the 4ohm (2 such 8ohm cabs could be used in the 2x 4ohm jacks though).
It has one 8ohm tap connected to 2 jacks, you can use one 8ohm cab, or 2x 16ohm cabs, one in each 8ohm jack. Again, total load on the 8ohm jacks must be 8ohms.
It has one 16ohm tap with one jack. Use 1x16ohm cab only.
It is not normal to use more than one tap (4ohm/8ohm/16ohm) at any one time, because all 3 taps would be placed in parallel with each other, pulling down the rated ohms of each tap. I don't know anyone who has tried it because the risk of damage is high (tube amps are very sensitive to speaker loads, SS amps are less so), but theoretically you could use more than one tap at a time IF you use speakers rated for twice the recommended load on each tap. E.G you could use one 8ohm speaker on the 4ohm output AND one 16ohm speaker on the 8ohm output. 32ohm speakers are not common, but this is what you would need to use on the 16ohm tap, whilst employing double the rated load on the other taps.
The same principal applies to all multitap output transformers, most amps tend to have one jack for each differernt tap though.
NEVER turn on a tube amp without a speaker attached, you will kill the power tube(s), most likely the output transformer too.
Read, re-read & re-read again this post before experimenting.
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