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Discussion Starter #1
I have a speaker related question. I picked up an '83 CSA (Canadian export) Marshall JCM 800 model 4104 (2x12 50 watt combo) a little while back. It's currently loaded with a pair of new-ish Celestion G12T-75's (8 ohms). The amp originally came with a pair of Celestion G12-65's. I'm ready to post want ads for a pair of era correct G12-65's, but was wondering if Marshall originally put 8 ohm or 16 ohm Celestions in their CSA 2x12 combos. I'd like to know before I begin my search.

If any member on this forum has this model of amp with original speakers, can you relay to me what ohms they are?

Thanks.
 

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I have the 2203 head, not the combo, and use it with a 2x21 loaded with G12-75 Creambacks and love that combination. Not that that matters for your purposes.
 

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Good luck finding the originals. It took me awhile to find mine. Ask for photos with the serial numbers. If they’re original they’ll probably be faded/hard to read.
 

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Given I sold an 80's JCM800 412 with those speakers for less than $500, you should be able to find the JCM800 212 cab with those speakers, and then just swap them.
 

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Regarding the G12-65 speakers- keep in mind there are a few different versions. I would avoid the versions with the 444 cones, those ones don't sound as good to me. Go for the 1777 cones.
 

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Discussion Starter #11
Regarding the G12-65 speakers- keep in mind there are a few different versions. I would avoid the versions with the 444 cones, those ones don't sound as good to me. Go for the 1777 cones.
Yeah, I already knew about the 1777 being the one to get.
 

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I just found out that they were 8 ohms. Thanks!
Are you sure about this? That means you shouldn't plug in another cap while the internal speakers are in use (assuming it's wired for 4 ohm total).
Could someone have meant the pair is wired for a total of 8 ohms?
 

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Back in the late 90's-2000's, I collected a few quads of the G12-65's that were used in the 80's JCM800 cabs and combos. The Canadian export versions were 8 ohms @ to comply with the CSA restriction that didn't allow the amps to be shipped/sold in Canada with the 16 ohm OT tap intact (on the premise that the amps would possibly catch fire at the higher impedance settings).
 

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All The CSA 2x12 I have seen definitley had 15 ohm 65’s and often came labelled as 130 watt but had g12m-70’s depending on the year.

I just sold a couple pairs that came from 2x12’s and were all 15 ohm t3054 1777. 444 cones were bass cones for the 65’s in the 800 bass cabs and can be ok depending on the style of music you play but they get pretty flubby the louder the volume.

800 lead series a and b 4x12 cabs that came with 65’s were 8 ohm in Canada. They are my favourite speaker with JCM series amps. Even better when paired with a couple of g12k-85’s in a 4x12. Finding the Rola 65’s nowadays is getting a little harder and a little more pricey.

Here are pics of the 15ohm t3054 1777 from 2x12’s and the 8ohm t3053 1777 for reference if you come across some. The heritage are just as good but a long break in period that sadly I think a lot of people never get past before selling them off.

86DA6897-3197-4993-830F-7AFE46D5F6A8.jpeg
4DF78E50-F0B2-4A3B-AB87-459575C5FE16.jpeg
49169410-2429-4243-855E-8489CFAE9071.jpeg

CD906A1D-9C6C-4FC9-8D34-31C668E6C7E5.jpeg
 

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All The CSA 2x12 I have seen definitley had 15 ohm 65’s and often came labelled as 130 watt but had g12m-70’s depending on the year.
That makes sense, a pair of 16ohm wired in parallel would be an 8 ohm cab so ok for the CSA versions. The 4x12 cabs would have used four 8 ohm speakers in series parallel for 8 ohm cab.
16ohm cabs or amps were not allowed in Canada at that time so the amps only had the 4 or 8 ohm settings on the impedance switch.
 

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Thanks for the info Rob. That's good to know if I ever run across a JCM800-1936 cab, I'll try to grab it. I really like the old 65's too, that few dB lower efficiency doesn't hurt either. I have two or three left, and a couple of the K-85's as well. Guess I'll have to try pairing those two up in a box.
make sure you check what’s inside instead of going off the badge. I bought a 1933 cab from a music store and asked if they were sure it had the original 65 in it, they assured it did and I didn’t feel it was necessary to make em take the back off being in a music store and all. Got it home and g12-70 which was the original speaker, but not the 65.Notorious Marshall switcheroo
 

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@tdotrob that K speaker also makes an outstanding single speaker solution, in the right cab. Of all things I put one in a cheap Jet City 1X12, which had a lot of physical volume and sounded great, and it was perfect with both Marshall and Mesa Rectifier voiced amps, hundred watters. Obviously you had to be aware of limitations but, for the basement band thing, awesome sounding speaker. I lucked out, walked into Avenue Guitars about 8-9 years ago looking for one, and they had an old British one on the shelf at the old price lol.

Tight bottom like a V30, but not the mid push. Crisp never spikey up top.
 
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