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Post by drewkimbo on Dec 30, 2015 22:01:57 GMT -7
Hello, I'm the proud owner of a preowned but like new Carmen ghia 2x10 combo with brakelite installed in cab. I've tried to research the brakelite, speakers and impedence. It's got 2 10" Dr.Z speakers at 16ohms each (from what I've read, wired parallel) to equal an 8 ohm load? When I purchased the amp, the brakelite was plugged into the 4 ohm jack. Shouldn't it be to the 8 ohm jack (wired parallel= 8ohm / wired in series= 32ohm load?) is this correct? If this is correct, another 8 ohm cab could be ran (via quality parallel Y cable) to cut load to 4 ohms, then the brakelite should be plugged into the 4 ohm jack? Or am I wrong about all of this??? Thanks in advance for assistance! Im new to the forum, so please let me know if this is better suited for the "troubleshooting" forum.
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Post by headshrinker (Marc) on Dec 30, 2015 22:12:49 GMT -7
You've got it all correct. Welcome to the forum. Just to add something in case you don't know, never use more than one of the taps with a Z.
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Post by drewkimbo on Dec 30, 2015 22:23:58 GMT -7
Thank you! So it's the same as all the vintage fenders I've owned. No matter what I wire in speaker wise, one jack that matches the load only. What confused me was the brakelite being plugged into the wrong jack. I've never used attenuation, so I wanted to make sure it didn't change anything. I know the blackface fenders (some of them) had the "external speaker" jack and I never understood that because they didn't have multiple taps on the OT's. So when u did use an external speaker, it dropped the load stressing the OT. I bet the Carmen ghia sounds really good plugged into the correct jack. 8 ohm load plugged into 4 ohm tap would cut a little bit of efficiency if it works the same as a vintage fender head I would think? I've gigged a vintage bassman (4ohm tap) through an 8 ohm cab to cut the volume about 30% to make it a little quieter. I'm assuming that would do the same running the ghia (8 ohm into the 4 ohm jack? Thanks again
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Post by rcrecelius on Dec 30, 2015 22:33:35 GMT -7
That may have been what the previous owner was doing too...although why do that if you have a BL  |
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Post by drewkimbo on Dec 31, 2015 7:13:42 GMT -7
I was actually able to talk to the old owner. He wasn't sure which input to plug into. I haven't picked the amp up yet. So I'm anxious to play it set up correctly. What is the difference between the 5751 and the 12ax7 preamp tubes? Last question I promise
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Post by meanslide on Dec 31, 2015 7:26:57 GMT -7
Welcome drewkimbo! For the tube differences, here's a good run down of preamp glass... KCANOS Preamp Tube GuideThe short answer is the 5751 has about 70% of the gain of a 12AX7. You can use it in V1 for a little more headroom in the Ghia. |
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Post by doctorice on Dec 31, 2015 7:57:04 GMT -7
Welcome aboard and congrats on the Ghia.
5751 used to be "standard issue" on the Ghia for V2, as I recall. It's likely the lack of reliable new tubes tipped Doc to go with the 12ax7 in that position. I've also read that it was a Nashville thing to swap V1 and V2, putting the 5751 first in line.
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Post by drewkimbo on Dec 31, 2015 11:07:10 GMT -7
So it's the same as anything else. 5751 and 12ax7 (or V1 and V2) are interchangeable. And both v1 and v2 can run a 12ax7s (which would be more gain than the recommended 5751)?
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Post by doctorice on Dec 31, 2015 11:34:07 GMT -7
So it's the same as anything else. 5751 and 12ax7 (or V1 and V2) are interchangeable. And both v1 and v2 can run a 12ax7s (which would be more gain than the recommended 5751)? Yup, you got it! |
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