Tim58

Dear Glen, Thank you for your comments. I will not make any changes to my cross overs after all, taking into account your opinion. Incidentally I tried another amplifier which was given to me recently, an SAE (Scientific Audio Electronics A202, I think they are an american company) the amp is a good quality one from the mid eighties, it has given me a noticeable improvement in quality and now I am satisfied! There was one last thing....... there's a noticeable hum when the amp is on and at rest. I thought it might need a dedicated earth. I was thinking I might earth the case since the power cable is only two core. I very much appreciate your comments. Please have a good day. Best regards from London.

Thanks GlennW, These speakers are at least 10 years old, I am beginning to think that replacing the crossover units would be easier than trying to find out the exact ratings for replacing the capacitors. I was advised by a speaker renovation specialist that capacitors dry out over time and that replacing them would dramatically improve the separation and response. I replaced the bass drivers because one got damaged I have new Monacor drivers in now and everythign is ok. I'm going to look into replacing the cross overs not just the capacitors. Would you say that capacitors do need replacing after ten years or so? Thanks again for your help. Tim

Dear fellow enthusiasts, I have a pair fo Tannoy 638 D80 floor standing hi fi speakes. I am intending to replace the capacitors but I only have limited informaiton about values. Tannoy only have limited wiring diagrams for this unit. The two grey capacitor have EVOX MMK -63 on the side and 15 uf k J8 underneath, so they are 15 uf each. I assume the 63 relates to voltage but I don't know if they are Ac or DC rated. Can I find this out by testing with a multi meter? I have a basic analogue multi meter. I'm not sure if I might be able to test the crossover circuit and find out if it is Ac or DC, maybe there is a way of working that out? The Blue capacitor has a long serial number 7100 0114 and the value as 2.7 uF but I can't see any voltage information or Ac or DC. Is it possible to find out the voltage rating form the serial number or by testing the circuit? I have attached some pictures of the crossover arrangement. The components are glued in to the bottom not on a PCB. I hope somebody experienced on this board may be able to help me. Thank you.