Different versions of 802?

Thanks for thinking along.

Imho the mystery is not solved yet. The discussion in the posted thread is about the difference between the 804a and 806a. Obviously these have the same height (length), yet different mass. I would expect these magnets to be 1/2inch less long than the 802 otherwise they won't fit in their smaller housing. The guy who sold me the units sent me pics of 802 (old style in green, same length as my unit) and 806 and there is an obvious difference in length, hence magnet length.

The only thing I can think of is that the magnet of my units has the same length as a 802 but has the inner/outer diameters of the 804. Purpously or by accident. Tonight i will make a new weight measurement to be shure of the 2.5 kg. If my theory is correct it should actually be a little more than the 806 weight ( providing published data is correct).

I have unfortunately no gaussmeter to check the gap.

Thinking of my post. The units may well be -undocumented- large versions of 806. Magnet mass is probably similar to that of the short version....

Just to make sure we're all on the same 'page', spec wise: http://www.lansingheritage.org/image...804a/page2.jpg

GM

Are there any kind of numbers on the back cover caps ? When Altec didn't use any kind of sticker/label they just stamped the model #'s on the back cap. Ex. 033952 = 802-8G, 23746 = 806-8A etc....

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Originally Posted by GM

Just to make sure we're all on the same 'page', spec wise: lansingheritage/images/altec/specs/components/802d-804a/page2

GM

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I think so. In the link of bowties last post the difference between the 804 and 806 is discussed. The conclusion was that the 804 has a smaller magnet ( smaller outer diameter) and a different phasingplug with tighter slots. The photo clearly shows that the 804 and 806 magnets have equal lenght and will fit into the same case.

I would think that one is not able to visually discriminate between both drivers with rear caps on and badges removed. One would expect the 806 to be heavier than the 804. The 802 magnet and hence casing is clearly bigger.

Data on the 806 is scarce.

Dit anyone put his 80x on the weight scale?

Quote:

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Originally Posted by Altec Best

Are there any kind of numbers on the back cover caps ? When Altec didn't use any kind of sticker/label they just stamped the model #'s on the back cap. Ex. 033952 = 802-8G, 23746 = 806-8A etc....

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Nothing on the rear covers. The polepiece has a code on its side though: 391217...

I did some measuring and made some photographs I can't post yet.

Rough unit 1, 802-8D badged, without rear cover, loading cap, diaphragm and screws: 3,432 gram = 7.57 lb
Rough unit 2, no badge, same conditions: 3,313 gram = 7.30 lb

Interesting!

Extra stuff weighs 175 gram = 0.386 lb add to both to compare with below.

Length from polepiece to front for both units: 68mm = 2.68 inch

Smooth unit with all stuff attatched (to lazy to take it off): 2.866 gram = 6.32 lb

Length from polepiece to front: 64mm = 2.52 inch

So that's 4 mm of difference in length = 0.16 inch, and a weight difference of at least 3.488 (incl stuff) minus 2.866 = 622 gram or 1.37 lb (22.2 oz).

On the net the regular green 806 look quite different (my units are black).