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Post by hollywood5150 on Jan 1, 2006 14:51:28 GMT -7
I have an older Ghia head with a "J" in the serial number, and a single 8 ohm out. I have heard these heads will run at 4 ohms safely. Is this correct?
Thanks
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Post by zdogma on Jan 27, 2006 6:50:20 GMT -7
Apparently the transformer is big enough to handle the mismatch. The real problems occur with 2 step mismatches. Marshall 16 ohm output into a 4 ohm cab will cook the transformer.
When I was growing up (about 15 or so) I had a bassman head that died on me due to a cab mismatch (I didn't really understand all that stuff then...)
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Post by billyguitar on Jan 27, 2006 11:49:42 GMT -7
A Bassman head is a 4 ohm head. A mismatch to 8 ohm or 16 ohms shouldn't have damaged anything, 16 wouldn't have sounded as good though. I remember lots of guys using marshall cabs with Bassman heads with no problem. You probably just had a random failure. Now if you were running it hard into 2 ohms or less, that would spell trouble.
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Post by zdogma on Jan 27, 2006 12:13:32 GMT -7
Yeah, most Bassman's are 4 ohm, this was one of those yellowy 61 heads with the 8 ohm out for a 1X12 cab, and I ran it into (i think, it was long ago) a 2 or 4 ohm PA cab. The amp tech thought that was what happened, anyway. Still could have been random, i guess.
The bassman 10 combos were also 8 ohm - that's what I replaced it with.
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Post by billyguitar on Jan 27, 2006 12:43:29 GMT -7
I have a '61 now. I was thinking it might have a replaced output transformer. I haven't looked at it closely in quite a while. If your had the 1-12" cab like mine then you're right it would be an 8 ohm head. They were made to be able to handle another 8 ohm cab, that's why they have the extension jack, which would make the load 4 ohms.
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