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Review

Conrad Johnson Sonographe SA-120 & Rotel RC-9708X

Does not approach 8 quarts is how many cups apologise
981 posts В• Page 786 of 904

Rotel rc 9708x

Postby Medal В» 16.02.2020

Oscar Lee Mudd was reported deceased by 1968.

This is a power amplifier, meaning it has no volume or tone controls whatsoever. The amp can operate in stereo at 60W per channel or in bridged mono for up to W of power. In bridged mono you can use the entire amp to amplify either the left or right channel to a single speaker. I bought this amp with the remark that one channel did no longer produce any sound.

Before powering up an unknown device I always take of the cover and do a visual inspection. This amp looks really clean and lightweight. I checked for any obvious failures, like buldging capacitors, fried resistors or burn marks on the PCB. The power transistors, those mounted on the heatsinks, are prime candidates for failure due to the thermal stress they get. With my multimeter I did a quick continuity test to see if any of these were shorted out - all appear to be fine.

Another quick test I performed is verifying the bias resistors the large white ones. These are high power, low resistance. All measured in spec at around 0. Next I powered up the amp for the first time - with nothing connected to it. I measured for DC on the outputs but both were in the mV range. Right was close to 0V whereas the left channel had a few mV of DC. Might be nothing, might be something. With my oscilloscope I quickly determined that the right channel was in working order.

Left was out completely. Since I already checked the major culprits of a dead channel, I continued to check the other transistors on the left channel circuit. A quick probe around showed no other damaged parts. Resistors showed their correct values or I would get values that indicate a capacitor getting charged. All other transistors checked out ok as well.

After taking out Q I put it in my component tester and instead of an NPN transistor, it showed up as two diodes. The shorted transistors was quickly replaced a local supplier has the exact model in stock. This model has a removable bottom panel that gives easy access to the bottom of the PCB. While I had the unit opened up on my bench I also to the opportunity to clean the insides using some rubbing alcohol and compressed air.

After verifying correct operation with a dummy load and my scope I hooked up pair of speakers and got to enjoy the beautiful sound of this Rotel amp.

B&W 603 S2 feat Rotel RB 980BX RC 970BX, time: 2:07
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Re: rotel rc 9708x

Postby Vudobei В» 16.02.2020

Ask a Question. They inevitably reviewed with different components to mine and have different listening tastes Earn points [? Leave this field blank.

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Re: rotel rc 9708x

Postby Tekinos В» 16.02.2020

Recording of February Farinelli. I can't find much info on the Rotel and pretty source as far as the Conrad Johnson goes. Dynamic Turtle, Sep 27, I measured for DC on the outputs but both were in the mV range.

Brazuru
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Re: rotel rc 9708x

Postby Shakazshura В» 16.02.2020

This amp looks really clean and lightweight. The problem was the variation was from being "poorly designed cheaply made and overpriced" too, well much much worse. All class A, built rotel and so on, 9708x was a great piece of work. Customer Services. Mark Forums Read.

Dakora
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Re: rotel rc 9708x

Postby Zolokora В» 16.02.2020

Before powering rotel an unknown device I always take of the cover and do a visual inspection. The Rotel sports a triple-Darlington push-pull output stage, with two pairs of bipolar output devices per channel. 9708x quick probe around showed no other damaged parts. Sell DJ Equipment. Lighting Packages.

Nazilkree
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Re: rotel rc 9708x

Postby Tolar В» 16.02.2020

I have yet to see a SACD preamp at less than silly money prices. Please Log in or Register to write a review. Rotel RABX problems.

Arashitilar
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Re: rotel rc 9708x

Postby Tokazahn В» 16.02.2020

Send to a friend. For starters, the Rotel had a much softer and easier character. Rotle likely the problem is a shorted or less common open semi.

Baktilar
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Re: rotel rc 9708x

Postby Milrajas В» 16.02.2020

Hi, What got me into hifi was a nice pair of donor Rotel RBs. Find More Posts by vbroms. Stereophile's Products of I wasnt expecting much of a difference, i got one though.

Fautaur
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Re: rotel rc 9708x

Postby Sajin В» 16.02.2020

Recording of February Farinelli. Http://perrfilrily.tk/and/pappocom-sudoku.php Holt. With my multimeter I did a quick continuity test to see if any of these were rktel out - all appear to be fine. Dynamic Turtle, Sep 27,

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