FFL’s Tannoy K3809 adventure (revitalization ………. again !?! )

My friend , known around as FFL ( younger  of two wakoo brothers from Nagybecskerek ) , brought a pair of , well , pretty beaten up K3809 Tannoys ; They’re having new HF diaphragms, but surround is long ago in rock solid form …….. well above 60Hz .

There were also few more problems – suspicious bass VC centering on one at least , sorta tired cones and ugly gaskets …….

I didn’t took any pic prior to dismantling magnet assemblies from baskets , but there will be few pics of drivers from above , prior to finishing steps , so you’ll have some insight in their condition , as they arrived on my bench ……..

 

Read picture captions for detailed info .

I had impression that glue between magnet assembly elements is sorta dry and brittle , so I decided to put glue on circumferential joints …..

When you’re measuring anything on this (and related) type of Tannoy , it’s not unusual to have some hiccups in readings ; usual culprit for that is intermittent contact between flexi wires and awful Molex-lookalike springy contacts ; what you are gonna do is this :

Now I’m having rock solid readings of all things electrical ……

Ok , on to VC examination ; one of them was looking good , but other one not so . However – Rdc and inductance (without magnet !!) are pretty much same for both , so I was breathing much easier , realizing that darker one is still good , even if evidently having tough history …….. nothing what some care can’t put back in shape .

So – I checked VC shape on both , and worse looking (darker VC) one is slightly oval ;Few moments of fear , careful bending of Alu-former with fingers  as only tool …… and VC is (mainly) properly shaped again ……..

I did the same on both bass voice coils ; after that , preparing for reassembly.

What I did in meantime is that I removed dust mesh – nitro solvent and plenty of soaking ….and patience – if you plan to have undamaged cone ; not that that is of any significance,considering that cone is going to have 2 layers of Dammar  :

They’re still ugly – discolored cone and rock solid surround , one having uneven and teared gasket , second one having sky-high (fat) gasket:

IMG_1470

Both magnets in place , so time for rejuvenating of surround and cones – explained here in details (scroll to half of page) .

HF dias in place , bass VC centering with 35Hz at 6-7mm(pp) excursion , two layers of Dammar on each bass cone , and result is as on pictures , while bass cones are again in ballpark of 35Hz Fs .

3 comments

  1. 0W says:

    Hey ya Lockwood guys…read and learn! 😉

  2. Zen Mod says:

    nuttin’ to learn for them …….. where’s da money in refurbishing like this ?

    😉

  3. 0W says:

    Good point!
    Maybe if we can make them believe they will collect more value by Kharma principle? ROFL

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