So I just picked up this quad of greenbacks today, and this is mostly a gamble but anyway.
Three of the speakers are 1968 “20w” greenbacks but of course are actually 25w, two of them have the same or very close date stamp on the arm, the third has the date stamp on the gasket (from a few months earlier). The 4th one is from 1970.
Now two of these speakers are good (one of the 68 and the one with the date code on the gasket, the top two speakers in the image) when I picked them up they were tested and good, check out on all the tests and no coil rub.
These two have been paid for, but the other two are where it gets interesting. If I decide to take them then I’ll send him $325usd, if not he is very happy with me bringing them back to him, nice guy.
The first one (the 1970) is missing the dust cap, everything else is in great condition with no repairs but due to the lack of dust cap which fell off a long time ago there is fine particles in between the centre of the magnet and the voice coil and it rub like crazy, not even rubs it’s the sound small little grains in there sliding. This speaker was treated as non functioning and mostly just thrown in as part of the deal.
The final one is where I request the help here, the owner did not realise there was issues with it until I plugged them in and briefly tested them when picking them up. All speakers were tested face up, on top of a piece of foam, individually, with a 15w amp going into them. This speaker had an apparent rattle mostly when playing on the low E, not bad but definitely there. Testing for coil rub there definitely is some, but in an interesting way.
This speaker has two repairs, one just above where one of the wires goes from the terminal into the cone, and another on the edge about 1.5 inches long that is partially in the doping. When punching from the top approx an 8th of the speaker at a time (cut like a pizza slice), only one quarter of the speaker rubs which is between the two repairs, not on them. When pushing from the back with two hands opposite each other, it only rubs when one hand is on the large repair, flip it 90deg and there is no rub.
The whole chassis has been tested against a new speaker and there are no deformities, there is a very slight flat spot at the site of the large repair near the rim. The small repair close to the centre does have some form of patch behind it that I will add photos of.
I’ve got 3 or 4 days to decide whether to keep them or bring them back
Basically for $325us are these worth my time? I have not had a chance to put them in a cap so I’ll do that tomorrow and see how bad the rattling is. These are very hard to come by here in Australia.
If not are you able to use a used cone from this broken speaker to recone another speaker? Otherwise what parts here are saveable?
Three of the speakers are 1968 “20w” greenbacks but of course are actually 25w, two of them have the same or very close date stamp on the arm, the third has the date stamp on the gasket (from a few months earlier). The 4th one is from 1970.
Now two of these speakers are good (one of the 68 and the one with the date code on the gasket, the top two speakers in the image) when I picked them up they were tested and good, check out on all the tests and no coil rub.
These two have been paid for, but the other two are where it gets interesting. If I decide to take them then I’ll send him $325usd, if not he is very happy with me bringing them back to him, nice guy.
The first one (the 1970) is missing the dust cap, everything else is in great condition with no repairs but due to the lack of dust cap which fell off a long time ago there is fine particles in between the centre of the magnet and the voice coil and it rub like crazy, not even rubs it’s the sound small little grains in there sliding. This speaker was treated as non functioning and mostly just thrown in as part of the deal.
The final one is where I request the help here, the owner did not realise there was issues with it until I plugged them in and briefly tested them when picking them up. All speakers were tested face up, on top of a piece of foam, individually, with a 15w amp going into them. This speaker had an apparent rattle mostly when playing on the low E, not bad but definitely there. Testing for coil rub there definitely is some, but in an interesting way.
This speaker has two repairs, one just above where one of the wires goes from the terminal into the cone, and another on the edge about 1.5 inches long that is partially in the doping. When punching from the top approx an 8th of the speaker at a time (cut like a pizza slice), only one quarter of the speaker rubs which is between the two repairs, not on them. When pushing from the back with two hands opposite each other, it only rubs when one hand is on the large repair, flip it 90deg and there is no rub.
The whole chassis has been tested against a new speaker and there are no deformities, there is a very slight flat spot at the site of the large repair near the rim. The small repair close to the centre does have some form of patch behind it that I will add photos of.
I’ve got 3 or 4 days to decide whether to keep them or bring them back
Basically for $325us are these worth my time? I have not had a chance to put them in a cap so I’ll do that tomorrow and see how bad the rattling is. These are very hard to come by here in Australia.
If not are you able to use a used cone from this broken speaker to recone another speaker? Otherwise what parts here are saveable?
