Looking for a Philips Woofer for the K12 Chassis
I recently acquired a Philips Goya 965 from Germany (Philips K12 Chassis). The bass speaker rubber surround has completely rotted away.
Has anyone got one of these? I think they were used in the KT4 chassis sets. Impedance is 12 Ohms.
Hi Paul, you can without trouble use a similar size from a small subwoofer, i did it with another K12, the sound was great
If a speaker is not available, would it be possible to use one of the HiFi speaker suspension repair kits? This type of idea.
I already suggested this over on UKVRRR. Speakerworks are brilliant and not expensive considering the shipping cost as well. They sell surrounds of all sizes and should have one to fit....and it's so easy to do with just a little care. I did my Hi Fi bass speakers some 17 years ago and they are still like new.
Replacing the surround is the best way to go if at all possible.
Musing at alternatives, since modern 4" dual cone drivers are typically 4/8Ω these would not match a TDA2610 used in the K12 chassis. According to the data sheet this device is specified to work with 15Ω loads. Low impedance speakers would complicate matters and require an impedance matching transformer. Original speaker is an enclosed magnetic field type and all modern replacements appear to be open field which could interfere and lead to CRT purity / convergence errors.
Information from the Philips/Mullard data sheet, part number AD4050 series is defined as:
AD = Philips/Mullard Audio Driver
40 = 4" round
500 = Magnet type, enclosed field sinter-pot (custom)
M = Dual cone
15 = Impedance 15Ω, DC resistance 12.7Ω
Resonant frequency = 60Hz
Power rating = 8W
In spite of all the foregoing, might be worth looking at this.... https://cpc.farnell.com/visaton