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890 power amplifier

890 power amplifier

Note: Your email address is included with the abuse report. Toggle navigation. Home Messages Hashtags. Search Cancel. Date Date 1 - 13 of 13 previous page next page. If I understand the manual correctly I need to go into the Linear Amp menu and turn the setting from off to on. Its been a learning experience. With most Kenwood rigs, you have to turn the Linear relay On using the menu "Amp relay" item.

Bob, K3AC. Bruce Bourdon. If it's a fairly modern Ameritron amp, not likely an "ARB" box is needed as the internal relay of the should be capable of handling the current. Thanks everyone for the help. Jack N3BBC. Features include balanced inputs transformer-coupled as well as unbalanced, separate level controls for each channel, and the option of flexible mono-block operation to deliver W into a wide range of loudspeaker loads. Build quality and finish are to EAR's usual high standards, with a distinctive touch of luxury in the thick brass front panel, heavily chromed and polished to a mirror finish.

Reliability is assured and there are no user adjustments. Purchased new in Purchased this amplifier in , and have taken excellent care of it. I was really impressed with the EAR amplifier when first receiving it. It was double-boxed, which is a very good idea because the amplifier is very heavy and very substantially built.

The chassis is very stiff and thick, providing great support for the transformers, tubes and circuitry. The tubes are held by circuit boards that are hang-fastened from the top plate. This gives the amplifier good aesthetics according to my eye as about one-quarter of the tube is below the top panel. There are two black tube cages -- one for each channel to protect the tubes.

These cages are fastened in a really strange way that makes them very difficult and very time consuming to remove and install. The same bolts that hang-fasten the power tubes circuit board are the ones that fasten the cages.

To loosen the cages, you have to remove the bottom yes, you read right cover from the amplifier. Then you turn the amplifier on its side and remove the two center nuts that fasten the KT90 power tube circuit board.

There is a total of six bolts holding each channels circuit board. Now you have the circuit board loose at the middle which flexes, thus allowing the removal of the bolts that screw to the tapped sheet metal of the cages.

The tapped sheet metal covers are too thin to get a good grab and therefore the two center bolts appear to lack the ability to become a tight fit and thereby hold the center portion of the circuit boards. In fact one of the tapped holes was already stripped! Okay George, all this is confusing. So what does this mean? Well, this complicated fastening system creates a few problems. It makes swapping tubes, removing and installing the tube cages a very difficult and time-consuming task.

It also does not allow the center bolts holding the circuit board to achieve a tight fit because of the little thread available at the cage. Finally, there is no center support of the circuit board when the cage is off, thus the board with the tubes sags and is very bouncy.

On this last point, one can find an appropriate nut to fasten the bolt to, which will solve the problem. Sadly, the cage can not be placed on a flat surface to aid in support. Surely on a product of this class there must be a better way of fastening the cage to the chassis. Perhaps this can be done by Allen bolts threaded to the top panel that will allow access to the cage and the tubes from the top without going inside the amplifier.

The eight power tubes are the relatively new KT90 manufactured by EI. Two tube amplifier designers told me that they use EI tubes in their pre-amplifiers. They agreed EI tubes are excellent and very quiet, but have low consistency, at least in pre-amplifier low signal tubes. They said one has to through about six to eight tubes to get one good one.

Both also said they are the best sounding of the modern-made conventional tubes. As they say, "no pain no gain. The front panel is very simple and very attractive. It is made from a thick piece of metal brass, I believe that has been chrome-played. An easy fix and could be attributed to possible rough shipping. The power transformer or mains transformer for you Brits is quite a good size, very heavy and is positioned in the middle front of the amplifier complete with chrome bell caps.

The output transformers are located at the rear corners of the chassis and are also topped off with chrome bell caps. Very nice. There is a metal cover on top of the chassis with the amplifier's schematic printed on it.

This cover screws off, allowing access to the soldered portion of the driver tube circuit board. The driver tubes face head down and are located inside the chassis. This arrangement would make it very easy to service the amplifier in allowing access to both sides of the board without removing it. Six line inputs and one tape output. Single-ended amplifier that can be used as an integrated or power amp. No connection required between pre-out and amp-in jacks. Uses EL output tubes.

Push-pull stereo integrated amplifier operating in enhanced triode mode. Uses EL84 output tubes 6 per channel. HiFi World Review. Push-pull power amplifier. Balanced and unbalanced operation. Available with black or chrome faceplate.

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  1. May 04,  · The EAR is a Push-pull power amplifier that outputs 70 Watts per channel stereo (bridgeable to watts mono) into 4, 8, or 16 ohms. It uses KT90 output tubes, is self-biasing and is capable of balanced and unbalanced vivaldiaudio.com: EAR.
  2. Apr 23,  · The EAR is, in designer Tim de Paravicini's own words, a very conventional tube amplifier. Each channel uses its own 6AQ8 dual-triode as a differential pair, working in concert with another dual-triode, the ubiquitous vivaldiaudio.comted Reading Time: 6 mins.
  3. This amplifier is among EAR's higher-powered models and produces 70 watts per channel in stereo, yet is bridgeable to watts in monoblock. For your information, EAR has recently unveiled some new products that include the power amplifier plus an integrated amplifier version called the
  4. EAR power amplifier Specifications. Sidebar 1: Specifications. Description: Stereo tubed power amplifier with inout level controls. Tube complement: two 6AQ8, two 12AX7, eight KT Output power: 70Wpc into 8 (dBW) or 16 ohms (dBW). Power bandwidth: 15HzkHz at.
  5. Taking as a starting point the circuits used in the integrated amplifier, Tim de Paravicini has addressed that need by producing the power amplifier. Using the innovative KT90 valve from EI, he has been able to offer 70W of clean Class-A audio from the same chassis as the
  6. Apr 23,  · EAR power amplifier Page 2. Considering the Purcell music associated with the funeral of Queen Mary (I balk at a more specific title than that if only to avoid the ire of those who rightly observe that we don't know for sure what was performed on that miserable day in ), the recording I most enjoy is the one made by John Eliot Gardiner Estimated Reading Time: 8 mins.
  7. Aug 10,  · Seller Notes: “ Parallel push-pull class A power amplifier using eight KT90 output valves (four per channel). 70 Watts per channel stereo (bridgeable to watts mono) into 4, 8, or 16 ohms. Features include balanced inputs (transformer-coupled) as well as unbalanced, separate level controls for each channel, and the option of flexible mono-block operation to deliver W into a wide range Shipping: Free.
  8. Rotel RB Stereo power amplifier with bridging option. add a review. Specifications. Power output: watts per channel into 8Ω (stereo), watts into 8Ω (mono) Frequency response: 15Hz to kHz. Total harmonic distortion: %. Damping factor: Input sensitivity: 1V.
  9. The EAR outputs 70Wpc in stereo mode or Wpc in bridged mode (i.e., when used as one of a pair of monoblocks). Each channel uses a 6AQ8 dual-triode tube as a differential pair, working with a 12AX7 dual-triode. The ’s input impedance is a fairly common 47k ohms, indicating good compatibility with a range of preamps.