bassinvader

i have a 412 cab with i think green backs,there goldie green lable,2 work,altho i repaired the paper on one,2 have blown coils they are G12H,40Hz 30watts....strange bit is
2 are 8Ohm
1is 6Ohm
1 is 15Ohm???? but thats hand written on.....
are the 2 blown worth recoiling if they are greenbacks?? these came with a park head i once had but it driffted off in the mists of time!!

Marshall Amps

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poeman33

G12H30's are not greenbacks...but they are great speakers. That sounds bizarre what is written on them. Any chance of some pics?

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janarn

G12H30's were Greenbacks until Celestion reissued the G12M as "The Greenback".

bassinvader

they do come in 15Ohm!!! found em on ebay!!

Ken

My early 1980's G12H-80's are 15 ohms too. I never found out why Celestion would not make them 16 ohms...anyone?

Ken

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1999 Marshall DSL 50
Music Man 65 Reverb late 1970's (?)
Late 1970's (?) Fender Champ
Marshall battery amp
1980 Model 1982A 4x12 cabinet G12H-80's 444 cones
1983 Model 1982B 4x12 cabinet G12-80's 444 cones
PRO 4x12 from the 1970's
Woodson 2x12
1976 Les Paul Standard
Epiphone Les Paul knockoff
ESP Lawsuit Explorer
1979 Chiquita Travel Guitar
1995 Taylor 310

Quasar-Kid

The difference between 15 and 16 ohms is meaningless...
Resistance is variable and fluxuates

So a 15 ohm speaker is 15 ohms about as often as it's 12 ohm or 17 ohms
depending on the signal and exact second you took the measurement

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poeman33

Thanks. You learn something every day.

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GIBSON67

Lets' have some pics...4x12 cabs should not have mixed 8 ohm and 16 ohm speakers. You need all 8 ohm or all 16(15 ohm)ohm wired in a series/parallel confirguration.

mickeydg5

Cool speakers. Post pictures please.

Celestion along with other manufacturers produced lots of different speakers. Lots were marked with resonance frequencies from 50Hz to 80Hz or so. I have never seen 40Hz, so please show some pictures with "T" numbers.

I know the topic of nominal impedance was brought up a little. Most speakers were labeled as 15/16, 8 or 4 ohms. There are the occasional oddball impedances like 10 and 6 ohms too which are seen sometimes.

Don't get caught up in the "Colored Cover Delimma". "Greenback" just means it has a green magnet cover and nothing more. Lots of speakers had green covers and lots of those same speakers were also distributed without covers. Does that make them "Invisiblebacks" or "Nobacks"?

GIBSON67

I like nobacks...and then we could also have missingbacks.

I've seen Celestion G12H30 T2328's with 1321 cones and they were labeled 40hz at 8 ohms.

I've aslo seen Celestion H12M25 T1925 with 444 cones and they were labeled 50hz at 16 ohms.

But I don't think I have seen 6 ohm Celestions, oh those would be cool for a 3x12.

mickeydg5

I am sure there are a good bit of missingbacks out there.

I have never owned a 10 or 6 ohm Celestion. I have read about or noticed the oddball impedance speakers. I guess they have their place but need to be matched up somehow to a particular amplifier. I believe one was part of a Park combo or stack. I may have seen some on schematics or as part of the description in a price guide or maybe even Ebay.

They are interesting but I have never tracked any because of the odd impedance.

A 40Hz speaker is very interesting. But I wonder, is it full range or mid/bass?

GIBSON67

I think that cone had a whizzer, but I can't remember.

bassinvader

they no longer in the cab as i blew one 8 and the 15,the other two are in a home made cab,living a miss matched life of 14 ohm!!....the seem to be heritage speakers,the two bust ones are the worth fixing or just scrap?

bassinvader

so this means i have an empty 412 cab...requireing speakers!

mickeydg5

What are the codes on the speakers? Pictures?
I would probably recone, particularly if vintage stuff.