Aleph 0s service manual

Unfortunately the other measurements that carried out in "Stereophile" are not of interest for me, since even bad sounding amplifiers deliver good results here. Even by 19 and 20 KHz IM check I get satisfactory results by the most of amplifiers from the world marked. The measurement conditions then are very hard. Only circuits with real first class engeneering release sometimes good simulation results by such difficult conditions.

I am very inquisitive whether this is possible by the Aleph 3 circuit in this manner, since it sounds so much better than most other audio amplifier devices in the same price class. The results I will show at next time so I have succes to get it from "circuitmaker". The amplifier is not designed to have any bandwidth to that frequency.

For me not the bandwidth is crucial. Much more important is for me, what kind of behavior is to observe at higher frequencies, far above the audible spectrum. If the amplifier behaves as a clean low pass filter, no audible distortion are to be expected If the amplifier go to a triangle resp. If there are only one voltage gain stage, I get only low pass character, but never the conversion from a sine wave in a saw tooth wave, even by highest frequencies arround 1 MHz To minimize this in cases of two voltage gain stages with NFB, I reduce the open loop gain of the first gain stage most performed modification step of me by amplifier service.

Independent of the describtion and graphs in stereophile I discover one thing in the circuit of Aleph 3, that I don't like. This capacitor is the so called Cdom C for dominant pole Let us see what happens by IM check with the follow frequencies: KHz so as KHz - one of my favorite measuring method, but very difficult to handle from all commercial audio amplifiers with more than one voltage gain stage. But I note, that the message "Access Violation" from Circuitmaker prevent the creating of the expected diagrams I put back the original parameters to investigate at first the frequency response with this capacitor of 1 nF pdf fig.

Without this capacitor there are clearly an oscillator around 3MHz, typical for two voltage gain stage and NFB without compensation. But even by the diagram of fig. My favorit step in such cases is to reduce the open loop gain in the first gain stage. This IM result is very good with respect to such high frequencies, and is clearly better compare to Fig. This result only surpassed by the circuits of the X-Series.

The last IM measurement, that I do, is the same as done at begin, but now also with the new constellation, i. By 19KHz and 20KHz now the results not so good.

What is the reason for this? Because the open loop gain arround this frequencies was reduced though this step? The frequency response of damping factor inverse frequency response of open loop gain please refer Fig.

But the reason for the very bad results of IM measurement of Fig 5 in opposite to Fig. But what could be the audible effect by Aleph 3 and the other Aleph devices through this step compare to the first circuit?

I haven't tested it by the Aleph devices, but in many other cases mostly additional buffer push pull output stages with idle current around mA I get mostly better results as before. Only by subwoofer applications I observe sometimes a disadvantage; the bass reproduction was less tight and clear as before, especially by such with low cabinets, heavy membrane cones and optimize versions for use by car hifi. Professional electrician not beginners!! If you can perform ac analysis with your spectrum analyzer, you can tune a max flat response arround 1 MHz use dummy resp shunt as load resistor and not your speakers for the aim of dummy to avoid blown away noiselessly your tweeters.

If there are a residual peak, you must additional enhance the values of both source resistors. Deirdre Blake's Ownd. Aleph 0s service manual. For this no need registration. Please take a look at the below related repair forum topics. May be help you to repair. Get the technical documents you need, including: schematic diagrams, wiring diagrams, and specification sheets for your Kohler Power generator. Aleph 0S. Aleph 1. S earch. B rowse.

U pload. W anted. File information:. Aleph0 rev1.