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May I ask what you have used to replace the 2SK97? I guess that you replace all fuseable resistors, they all seem to be way off: did you find any other resistor(s) that were way off to? which resistors did you replace that are shown in the picture? I mean the little black one's? Did...

You could plug in i.e. a Sony CDPX707ES/CDPX777ES directly into an power amp skipping the preamp all together... These beautiful CD players do have a volume output control. :)

Hi Oilmaster I am about to start working also on a TAN7B to recap re-diode etc etc and I see that you replaced the input stage dual FET 2SK97? Were you still able to get these or did you use a replacement, if so which one? Anybody else that recommend a replacer for the 2SK97? It would be...

concrete has a brittle structure which can easely cracked but can bare high baring or compresssion loads. You can describe poured reinforced concrete as being a stack of bricks, each brick has a whole in the middle, stack them, put the rod through and compress the brick stack using washers...

Thanks for your input. The question is: how can you determine these parameters? ie how can I determine let's say the first param the resonance freq of a speaker? etc etc

I think that this sounding has also something to do with the tension on the reinforcement of the concrete steel bars? Just like a rivet: a rivet under tension has a high pitch/sound Interesting question is : how do you determine the resonance freq of a, in this case, concrete casing? Tap the...

Many argue that concrete has a certain pitch, which must be true due to the compression of the concrete by the steel enforcing (steel is like a string on a gitar under tension in an ideal concrete + steel combination) The main question however is I think: what is the resonance freq of the...

This web site http://lenardaudio.com/education/05_speakers_4.html is by the way very interesting: it talks about constructing the perfect speaker cabinet for a woofer using bricks :) or ie sandwiching sand between 2 sheets and covert by lead on the inside, which was suggested before in...

Interesting!!! Thanks for the input. I think or get the feeling that ideally the cabinet should silence as maximum as possible? Like the remark that you will defintly hear concrete when you hit it with a hammer? May be the question is more interesting than the answer (as is in many...

what in terms of dimensions and or shapes? remember : its only for 20 - 200 Hz note: there are lightweight concretes out there with small styrofoam bubbles which are +/- 20% lighter than reg concrete

Hi All, I bought a while ago a Bang and Olufsun subwoofer that has a range of 20Hz - 200 Hz from a Beolab 2. A magnificent design, quite different from a standard Woofer design: The Beolab has normally a very small casing because 2 passive speakers are used in combination with one...

I still have to repair my TAN7B but my 8550 is working like a charm: the sound is sooo very very sweat: it is amazing. It is worth every penny. I also have to get my 5550 working again. I expect that the 5550 is pretty close to the 8550 except for the power which you don't need...

Hi, Can somebody explain the global design of the class-A and class B amplifier boards as shown on page 18 of the Sony TAN 8550 end amplifier Service manual? Anybody??? Thanks

@packrat did you end up fixing the bad segments of the LCD? I bought the same deck and the seller told me that the LCD leaked and that it doesn't work at all. ;(

I am upgrading my Sony TAN 5550 with new PSU caps and replacing those nasty diodes. I consider my device to be defect because i am not a 100% sure that nothing is switched (plugs) or broken while replacing etc etc My approach is to work from one module to get it going as expected, when you are...

Hi all, I just bought a Sony TC-K8B which has a leaking LCD screen so nothing of this nice LCD can be seen. Is there a way to repair or to inject that fluid may be using a syringe? Where can I find that specific fluid? I have to idea if this going to be even possible. Regrds

I think a more theoretical approach may give us some cluess on whether this is a good idea or no. Lets start with the basic diagram that defines the context of this question, a nice description is I think : http://en.wikipedia.org/wiki/Rectifier#Rectifier_output_smoothing In this...

I think a solution would be to put a few watts resistor in serie between the transformer to limit the initial current: when the caps are completely emptied via the parallel resistor over time that in that case the initial current @ 55 volts is quite steap, that is the reason for the slow fuses...