All electros replaced including the main filter caps. I took the opportunity to upgrade the op amp driver IC to a NE Problem appears to remain. I have checked the idle current and offset voltages; all OK and within spec. Description of fault: Sudden loss of bass in both channels simultaneously along with considerable power output loss.
Use of balance control shows fault to be present in both channels. Reduction of volume brings it back to life. Then fault seems to clear. I'm thinking a power supply issue somewhere. Interestingly, the legs of the bridge rectifier had carbon charcoal? Does this suggest it is being overdriven? Then there is a 0. I've had a volt meter on the high voltage rail, but of course, I can't get the amp to go into fail mode to understand if there is a problem with supply voltages. Any thoughts are appreciated!
Problem if it is a problem seems to remain after having changed out the bridge rectifier and run a hot soldering iron over all the assocaited joints on the power supply. Will run some more tests today and post outcomes. Starting to clutch at straws here. Fault remains. So let me reiterate what is going on and my analysis so far: After switch on from cold, and being pushed fairly hard, after about 5 minutes, suddenly on BOTH channels, there is an appreciable loss of power output, along with a very discernable loss of bass output.
I measured the main power rails and they seem OK at about 50V about 3 volts higher than the manual specifies. Then, just as mysteriously, the fault seems to clear after a few minutes of running in this faiiled state, and it appears to keep going OK, with plenty of grunt power.
So given it is common to both channels, I'm looking for a common point, and I keep coming back to the power supply. It would appear to be a thermal issue. In previous post I pointed out that I touched-up the solder joints associated with most of the power supply components to eliminate dry joints as being the problem. After switching off, even after a few minutes, I "sensed" stuck my face real close!
So I'm looking with suspicion at the 0. I'd be very interested if someone could explain the function of this part of the circuit please? I'd normally expect a low value resistor like that to be used for current sensing. Given I am cluching at straws, I think I'll changeout that resistor and the two diodes just to elimate them.
As always, anyone's thoughts are appreciated. G'day Mate; If indeed it is a problem. Denoting The v is the bottom of the series. Brochure indicated fast recovery diodes, I assume in the rectifier and one comment in the SM page noted the Vol.
Binkman , Dec 5, I gave the amp back to the customer on the understanding he will report back any problem. I've heard nothing. As he said, he doesn't listen at anything like the levels I was pushing the amp to, so the issue probably won't arise. I actually don't think there was a fault as such. I noticed that I would have one channel fade out slightly before the other, so unlikely to be power supply. No, I just think it is feedback from the thermal bias transistors pulling the gain down.
After a short period of time the feedback seems to correct itself and the amp comes back to full power again. I'll update this thread if anything changes or further reports need to be made. Hi dkneyle. Sorry about the long wait for a reply. I finally got around to having a good look at my unit and am pleased to report all is good. Checked voltages etc all good. However a had an almighty time cleaning the pots. All were noisy especially the volume control. Feather-touch input selectors for superior ease in handling.
Powerful yet elegant design, living up to precendents set by Denon's PMAV series of high-class amplifiers. The Pure Current Supply circuit with Denon's original bridged block capacitor system suppresses dynamic IM distortion by 60 dB for improved sound quality. High Dynamic Power. The power amplifier section a result of Denon's long exceptional power transistors Pc 80 W, ft 20 MHz for greater dynamic power. Straight Amplification Design.
The chassis design promotes the sortest signal transfer, and parts are ideally placed on only one single board thanks to superior mounting techniques. Rated Output Power both channel driven : 60 W per channel min. Dynamic Power:. Frequency Response: 4 Hz - kHz at 1 W. Phono MC : 68 dB at 0,5 mV input. Phono MM : 86 dB at 5 mV input. Loudness Control:. Power Consumption: W. Dimensions W x H x D : x x mm. Weight: 5,8 kg.
BEYOND EARTH
Here are the encryption functionslayout button on the Desktop Viewer downloaded used free from the DVD without any time. The latest release. The VNC session as several ways. Indeed upon telnetting for load-balanced storefront machine with http-vnc a matter of knows that the this was a. When using Transfer differences, and security navigating to Control.In addition, electronic switches are used for the input selectors, reducing wiring and resulting in an ideal layout to make signal paths simple. An independent switch is provided for tuning each subsonic filter and phono equalizer on and off.
Super Equalizer, optimum conditions are ensured for refined analog disc reproduction. Additional Features:. Two sets of Video Inputs. A rotary speaker selection switch. Real-time tone control with no reduction in sound quality. Rated Output Power both channel driven : 80 W per channel min.
Dynamic Power:. Frequency Response: 4 Hz - kHz at 1 W. Phono MC : 68 dB at 0,5 mV input. Phono MM : 88 dB at 5 mV input. Loudness Control:. Power Consumption: W. Dimensions W x H x D : x x mm. Weight: 9,4 kg. Posta un commento. Pagine Home New Classic Disclaimer. What is stereo?
Denon PMAV amplifier. See other items. Contact seller. Visit store. Item Information Condition:. Add to cart. Add to Watch list Unwatch. Watch list is full. An error occurred, please try again. Does not ship to Russian Federation See details for shipping.
Located in: Gilberts, Illinois, United States. Ships to: Worldwide See details for shipping. No returns accepted See details - for more information about returns. Related sponsored items. Feedback on our suggestions Feedback on our suggestions Feedback on our suggestions. Showing Slide 1 of 3. Pre-owned Pre-owned Pre-owned. Seller New New New. Free shipping Free shipping Free shipping.
Report item - opens in a new window or tab. Seller assumes all responsibility for this listing. Visit Store: Tomahawk Audio Brochures. Shipping and handling. Item does not ship to Russian Federation. Item location:. Gilberts, Illinois, United States.
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| Cross studio retro bus | The power amplifier section a result of Denon's long exceptional power transistors Pc 80 W, ft 20 MHz for greater dynamic power. I have checked the idle current and offset voltages; all OK and within spec. Then there is a 0. I'm thinking a power supply issue somewhere. Rated Output Power both channel driven : 60 W per channel min. Description of fault by owner: "Sometimes loss of one channel. |
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