Suchergebnisse

Hello everyone, before moving to the level calibration, I noticed a peculiarity of automatic recording level function ( Alc ). This tape deck has the 0 db VU calibrated to + 3dB conventional reference. The calibration shall be performed at the play level of 580mv on pin 7 of the Dolby Ic for 0db meter reading. This setting must not be so done with test cassette 0db reference conventional (160nw/m, photo 1) but with Dolby cassette test ( which means + 3dB; 200nw/m, photo 2). Reference cassette te…

Dear Micheal good morning, yes, i'm in agreement with you when you speak of the values ​​of Wima capacitors smaller than the values ​​of the electrolyte. Thank you for introducing me to the different types and sizes of Wima capacitors. This will help me choose calmly the number I need. I will use the e-bay, because in Italy is complicated to do this. I do not know why (perhaps the crisis is the cause ) in Italy going worse and worse, the distributors of electronic components have lost the desire…

Good evening everyone, I'm calibrating the tape deck, please a question to the owners of Saba 9940/9941: during recording, when the ALC tape deck function is "on ", the needles of the instruments which value mark? are close to 0db or -3db around? let me know! thanks to all, Giuseppe.

To Michael (kugel-balu ) : hello and thank you for your interest. Yes, you are right when you say that the performance of Wima capacitors are better than tantalum. Doing authorized service representative to brand Revox, I really many tantalum capacitors to be used. Currently I'm getting good results with tantalum capacitors and sound very convincing to me. I have to make a count of the values ​​of the capacitors and I have to take into account the physical compatibility of Wima capacitors for th…

To Achim: Yes, 40 years is not short, even for the most valuable components. I'm replacing all with tantalum, i have very many, with results that sound really good. Thank you for your interest, continues to follow me. Good evening. Giuseppe.

To Tapeworm 664: thank you for what you say. The value of 9941 deserves all this attention. I have noticed that some of the settings ( tape, tuner ) do not appear in the service of the database. But these settings are quite intuitive and will be executed. Now as I write this I have not yet finished the job closing the tape deck because I noticed that a shielded cable that connects the head rec / play the circuit is faulty. Sometimes the signal disappears. It is damaged at the point where the for…

For Andreas, modulator: oh yes, i made a mistake. I apologize.

Hello everyone, well, after having repaired the general problems of audio amplification I passed the review of the tape deck. I had to completely disassemble the mechanics, clean, wash it. ( photo 1) The reel motor gave electric spikes during rotation and so I had to open it and clean from oxide the engine manifold and brushes. The direct drive motor was very hard to spin and dry. I think that all the equipment has been used in a very smoky places, because the mechanical parts are slightly stick…

To Modulator dl2jas : yes, thank you. Giuseppe Mazzilli.

Hello Gunnar, I show you a picture of new tantalum capacitors, which i normally replace in Revox equipment, instead of the original Philips electrolytic. In a technical bulletin official Revox is specifically asked to replace the faulty capacitors Philips of small capacity with " Tantalum capacitors." The report is dated eighties, when perhaps the Wima capacitors were too " bulky " to be mounted on the PCB. But i'm not sure that it was the " real " reason. The capacitors, such as transistors and…

Good morning to all, as I said here I am again for the news. I said that the work would continue repairing the problems of preamp audio. I cleaned the switches and potentiometers with contact cleaner before ( just a little, of course), then with the help of the oscilloscope I found the cause of the fault to the right channel bass controller. The two in the photo marked Philips capacitors have a low value (1.3 MF left channel, 0.7 MF right channel !!). Yes, i must replace them. During my technici…

Today is Sunday, hello everyone.....well, after the repair of the power supply, a proper check of the voltage and a first clean from dust inside, I reinstalled the power supply module and I checked the remaining circuits of the UHC 9941 : The FM radio does not receive for nothing. The left tape vu meter goes to the middle value while the right tape VU meter does not work. The other bands seem to recieve something; the cassette deck goes into play, but after a while ( 10 seconds) goes in stop and…

Good evening everyone, here the photo of the repair of the power supply of Saba 9941. The great bridge rectifier is 100v/10a type and was coupled with the cooling radiator. The capacitors are large 10.000MF/63V protected by silicone hat. The fuse holders are protected in plastic case. The capacitor 220Mf is 100v, as recommended to me. Resistance 2.2 ohms is the type fused integrated. The bridge rectifier square D in 1427 was replaced as recommende to me: I was able to find the same square type, …

Hello Achim, good morning to Gunnar and good morning to everyone who wants to follow me and help me with their advice with the repair work and restoration of Saba UHC 9941. While the work on the power board go ahead (but without haste, with the pleasure of doing things right) I'm here now to write something that goes more technical part of the speech. I'm 49 years old ( next August 25: 50, yes make it !! ), I have worked for 21 years at the authorized support of these brands: Panasonic, Technics…

Hello Achim and Gunnar ! I agree with the choice of 2 capacitors Matshushita of 10.000MF / 63V. I will apply those. I'll have to change, even if good, the bridge rectifier of + - 35volts. In fact, the bridge mounted is a B80-C5000/3300 type, which means 80volt (max) and 5A (max). At this bridge you can apply a maximum capacity of 5000MF = 2.5 A. 2.5 A is the half of 5A, because the other 2,5A will be consumed by the circuit power audio during the conduction of the diodes of the bridge, at maximu…

Hello Achim, welcome to the post. But now I forgot that I have added to a topic not posted by me and inserting a new topic out initial discussion. In addition, a discussion is in German while I'm speaking in English. I apologize for both errors with all of you and ask you if I have to-re post the whole thing into a new topic. For what you say, Achim, I am in agreement. I know well the question of budget because I worked at Grundig as authorized service center in Rome for several years and i am w…

Zitat: „nightbear postete Zitat: „Giuseppe Mazzilli postete So what has prompted the German designers Saba to do so? I think simply the problem of space. “ Hello Giuseppe, this probably also was a question of money. You must keep in mind that the managers in the developement section had to observe certain budgets. The retail price was fixed by the marketprices of the competitors´ products plus SABA had to yield a little Profit also. They would have come up with a solution to the space-problem fo…

The Beautifull 6800MF/40V Elko capacitator. Elko%20Capacitator.JPG

Hello Gunnar, thank for your reply. I hope that other lovers of the product give me a help as you ! Initially I thought I confine myself to the replacement of defective parts only, to avoid intervening too invasive. In light of what you said to me, thanks to the experience you have on the product, I will do as you advise me. I am sorry, however, to change those beautiful capacitors Elko (2200MF / 6800 MF) which have not given acid and look good with the test instrument capacitance. The capacitor…

Power%20Supply%20damage.JPG Hello guys, today is Saturday and we start from here. We begin to repair the power .... We have, in short-circuit, the two capacitors marked with the resistance of 2.2 ohm / 2w. There are two blown fuses 2AT also, plugged into the same circuit. Fortunately, as you can see, there is no reversal of acid. The photo resolution is limited by the load capacity of the server, it is good the same! Thank you all and see you later! Giuseppe Mazzilli from Rome, Italy.