Wiring 4 Scumbacks in 4/12 Cab

[Scumback Speakers]

My guess is that they had variable build standards for building cabs back in the 60's, and they didn't really standardize it all till 72 and later. Not that it matters a whole bunch, it's just interesting to see the evolution of the cab build.

The most important thing is that the cab wood has dried out, gotten more resonant and as long as they don't rattle, or make weird noises, you should be good to go.

[skyboltone]

I think it's interesting too that the tolex rolls over the back attachment cleats rather than the cleats being screwed through the tolex. I suppose they felt this provided a bit of a gasket. I have tried both ways on my builds and it's much harder to make the tolex conform to the cleats.

I'll have to try again.

Dan

[martins3325]

oops..error

[martins3325]

My guess is that they had variable build standards for building cabs back in the 60's, and they didn't really standardize it all till 72 and later. Not that it matters a whole bunch, it's just interesting to see the evolution of the cab build.

The most important thing is that the cab wood has dried out, gotten more resonant and as long as they don't rattle, or make weird noises, you should be good to go.

Jim I know you are something of a old celestion expert..I wondered what you thought of these speakers I just bought. The seller --Ben-- mentioned having dealt with you before and had nothing but nice things to say about your speakers --which falls on deaf ears because I own 4 scumbacks so I know how good they are-- Anyway he seems like a straight up guy..something of an impulse buy...they will go into the previosly pictured cab..and those speakers will likely migrate to my Blues Pearl Copperhead 4x12. Though i really need to lose the G12H anniversary and the weber anniversary clone...too bright and harsh for my taste. They look in good shape..they seem somewhat an anomaly '72 black tab rola g12m-55hz quad with T1221 102/3 cone code. Much different than the pre-rola? Paid $725 for the quad shipped..decent deal? Win some lose some if not. Thoughts?
http://cgi.ebay.co.uk/ws/eBayISAPI.dll? ... 0251476683

[Scumback Speakers]

I've got speakers that are dated 1974 with black tabs and 102/14 cones, as well as 102/3 cones, so it's not impossible, just not typical.

Those are the wrong labels, though, for a T1221 G12M. They were always 75hz cones, not 55hz. The 55hz would have been 102/14 cones.

In any case, you did real well. Hope they get to you OK, and sound good, with no issues.

[martins3325]

Well thats good to hear..I hope they arrive with no issues as well. Hopefully you had good dealings with him..he tells me he sold you some pre-rolas while you were working on the inception of the scumbacks.
If they are legit, then I assume they are essentially pre-rolas with Rola labels..I can live with that if so!

I also wouldnt think it far fetched that the factory mis-labeled the bass response and they actually are mis-labeled from the factory. I was reading some and it seems celestion did do some anomolous things at times regarding labeling. Curious is there a way to test the bass response..would be interesting, and an anomaly I suppose, if they were in fact 55hz, or is the bass resonance strictly a product of only the cone paper and hence they would have to be 75hz?

Anyway, thanks for all your valuable input. It seems there are very few people who are truly expert on these type topics and we are lucky enough to have a generous and sharing one here! Your a great asset to any gear oriented forum!

[Scumback Speakers]

I'm not sure how you'd test the bass response without meters, scientific gear and tests involved.

I just know what the cones are based on the individual cone #, etc.

102 003, 102/3, 102 3 and 3 cones are 75 hz. So are 1777, 53H1777 and 6402 cones (later production after 74).

102 014, 102/14, 102 14 and 4 cones are 55hz. So are 444 cones (after 74 again).

I've seen many mislabeled Celestions from the factory. Usually it's the other way around, 75hz labels on 55hz speaker cones, but you've got the opposite there.

Yes, the Rola Celestion 102/3 cones are the same as the 102 003. The black tab is a bonus, but really only bragging rights.

I have three different T1221 G12M's and G12H30's from April, 71. Each version has a 102 003, 102 3 and 3 cone, so these numbers were all used post 1970. Before then, it's usually just the 102 003 cone, but very early G12M and G12H30's had H1777 75 hz cones. By early I mean 64-66 as the Pulsonic 102 003 cones showed up in May of 66.

So you scored. There's no tone in the label, speaker tab color or the magnet cover color...just the cone. Why everyone freaks on the label is beyond me, I guess it's a status thing.

I'm only after the tone. So opening up a 4x12 cab to show off my labels and speaker tab color is a bit beyond me...