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Vintage Tweeter ID

S

sybil

pfm Member
Just picked up a trio of unidentified vintage tweeters on eBay for a fiver and I thought I would see if anyone here can ID them!

https://rover.ebay.com/rover/0/0/0?mpre=https://www.ebay.co.uk/ulk/itm/254082734107

The ad says they are for a BBC LS5/9 but they look much older than 1983 and the LS5/9 always used an Audax 34mm soft dome to my knowledge? These look like a Melinex dome or similar and probably late 60s/early 70s vintage. It says 20mm on the handwritten labels but they look to be a bigger dome than an early T27, I can confirm when I receive them.

Any pointers gladly received!
 
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The soft dome tweeter was patented in 1967, so these are likely to be 1970's vintage at the earliest, which would fit with the description as being R&D examples. They certainly look like lab-made R&D parts to me (knowing naff-all about speaker development, but plenty about R&D builds in general).

It is extremely difficult to tell from the photo's, but PETP (ICI trade name Melinex) and things like poly-propylene, do not age to a changed colour or milkiness. If they are milky and/or yellowed, you are really looking at a plasticised polymer, such as PVC.
 
Thanks Vinny this is good to know. I agree they do look like prototypes of something! Or perhaps they were designed for rear mounting where the faceplate wouldn’t be seen. I will put up some better photos when I receive them but I think the domes look clear and mostly unyellowed - the copper colour you can see is the edge of the voicecoil on the former. They are certainly distinctive looking, the Coles 4001 supertweeter had a similar look.
 
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