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This will be based on the 501 model as you did not give a model Also I am assuming speakers are 8 ohms which I have no firm information for the Tannoy, but they should be marked when you open the unit. We are allowed 40 watt RMS for the woofer and 20 watts RMS according to the specs. They do not tell us what impedance the speakers are so we will do calculations based on 8 ohm speakers... if yours are different, then recalculate; P = I^2 * R so for 40 watts and 8 ohms then I squared = 5 or the current is about 2.3 amps max... You COULD use a 2.5 amp fuse, but if they were my speakers I would use a 2 amp fast blow which gives a bit of margin for the woofer. Now for the Tweeter we have I squared is 20/8 so this comes out I squared equals 2.5 or taking the square root we have 1.58... you could use a 1.75 amp, but if they were mine, I would use either a 1.5 amp or even a 1 amp as the tweeters seem to get blown in these. ALL of these calcs are based on the specs of power for the 501 model and ASSUME 8 ohm speakers... Recalculate if your units have different impedance thaan the assumed 8 ohms.
Hi,
If you take care of your speakers, it may give you good service for another 8 to 10 years. The working of a speaker depends on the condition of diaphragm and voice coil of the speaker. If speaker is not overdriven(given more audio level than its power rating), kept free from moisture and diaphragm is prevented from damage, then speaker will work for 10-15 (even more) year with out any trouble. Thanks for using Fixya. Rating answer will encourage me.
Check the gain structure through the board. Check all the mix bus assignmentsie what is routed to the masters. Normally hiss can be reduced with good gain structure and ensuring all not being used is correctly turned off. Test the speakers with another suitable source If the speaker are less hissy on the alt source and you have checked all the mixer gains and eq, it is possible the board is noisy because of some component failure. Try audio isolation transformers on the output of the board, beg or borrow a good quality pair first to test, as they are expensive.
tannoy dc speakers are built to very high tolerances. they are very easy to damage if taken apart so i suggest you contact a specialist tannoy service shop. i know a shop in london who sells a lot of vintage tannoy speakers and he says very few repair shops are capable of fixing these dc drivers. good luck
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