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Installing & information about Tannoy HF tweeters Silver / Red / Golds, HPD / K series (25xx/31xx/38xx)


Place speaker cone down, with magnet cover pointing upwards.  You can do this with the speaker still bolted in place, if you can get access to the rear. Sometimes, you have to remove the speaker from the cabinet. 

Remove the 4 magnet cover screws and lift off magnet cover. Unsolder the 2 thin wires that go to the HF unit, note colours are important, to re-connected the same way round.  Be careful, not too much heat, in case you want to re-use. Undo the 4 HF screws and remove. Lift off the HF unit, upwards, vertically. There should be the HF unit and a round paper gasket.  You re-use this paper gasket. 

Have a good look down the hole where the HF was, dust out with new paint brush, and the blow out with your breath for a final clean. Important no dust or debris. 

Take new HF and carefully put in place, remembering to put back the paper gasket. It should just locate itself in the right place. Put back the 4 screws, do not over tighten. Do all 4 up loosely at first, do not over tighten one before doing the others.  Do not over tighten.

Re-solder the 2 HF wires, noting to get the correct way round. There are 2 solder lugs. Each lug has 2 places to solder. One is for the very fine HF wire, the other one is for other connection wire. DO NOT SOLDER THE CONNECTION WIRE TO THE SAME POINT AS THE FINE HF WIRE.  Be cautious with the heat, only apply just enough heat to make good joint. Do not keep the soldering iron on too long, as easy to melt plastic and also transfer heat along to the fine HF wire. 

Tested the speaker and should sound fine, 95% of the time. If not, loosen the 4 screws, adjust slightly and re-tighten. You might need to do this several times.  If you are still having trouble, remove the 4 screws again, rotate the HF 90 degrees, and repeat tightening process. Again, you can use the process of rotation and adjustment until it works. That said, they are easy to fit and usually it works first time without all the fiddling about. 


Simply, these fits all Tannoys from Silver, Reds, Golds, HPDs, K Series (25xx 31xx 38xx), because can be ordered with universal spacer kit. Tannoys last production run was late 2017, we had that delivery. So finally available again we have new genuine HFs, important correct ohms, usually between 9 and 10 ohm, if you order a pair, I will match as close as possible, FYI - over the 70 years of production, ohms varied from 8 to 11 ohms, new production of replacement Tannoy / Lockwood HFs / diaphragms.

Replacement for 7900-0205 & 7900-0105. Lockwood “logo & stamped”. Official & correct Lockwood MainlyTannoy part number 7900-0205L. Fully approved by Lockwood Loudspeakers (established in 1930) & MainlyTannoy (established in 1973).

One type fits all … because we offer “spacer kit”. So choose “without” or “with” spacer kit. With includes two 0.9mm aluminum spacers. Can be bought separately, if needed.

Why spacers ? It’s slightly complicated. Coil depth varies over production. Early Silver & Reds & some Golds have short coils. Hole depth where coil goes also varied over production. K series (25xx 31xx 38xx, ALWAYS need spacers, usually x2 per HF). The ali ring you see on the HF, IS NOT the ali ring on old 7900-0105. What you see is 7900-0205, the ali ring is part of production. Add 2 separate extra ali rings = 7900-0105. If in doubt, order with ali rings.

A general rule. Silvers & Reds nearly always need spacers. Golds vary .. early Golds often need spacers. Late Golds usually don’t. Many 3LZ usually need spacers, but not all. HPDs usually don’t need spacers K series, always needs 2 spacers. Plus you can use the paper gaskets you already have.

Each & every one is 100% tested in the UK prior to dis-patch. Test stamp applied, unique serial number applied to prevent fraud. If it's supplied by MainlyTannoy, is going to be top spec.

Hope this is enough details.  Good luck. 

6 Dec 2021 v2