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  1. I am thinking of upgrading (changing to newer model) my Denon Avr 1709 . I need good advice to decide which one is better. I can’t see a much difference when comparing specs side by side. denon AVR X2400H. Vs. Denon AVR X2500H. or even the Denon x1500H or do you think none of them are good. need to know a bit soon
  2. A SNAer entrusted this BEAST to me for a service, clean, and to rectify a non-functional scope. We decided not to embark upon a full rebuild due to the time and cost involved. These are fairly complex pieces of kit! Maybe one day... The Marantz 2500 was produced during the 'receiver wars' era in the 70's and a beast, both in a physical sense and in terms of power output. 250WPC is nothing to sneeze at! Here's a photo showing the size of the filter caps and toroidal transformer. The toroid is the largest I've seen in any domestic hifi gear of this era. ENORMOUS springs to mind! A soft drink can is provided for scale. The output transistors are mounted on a big tunnel heatsink with rear mounted fan. Each output transistor has a smaller heatsink with 'fingers' that help to better exchange heat. Overall, this receiver is in good condition for its age, both inside and out. It had the typical 35+ years of dirt and grime on the outside from general use, but a deep clean has rectified this as per the pics below. Unfortunately I didn't take a 'before' photo, but the receiver has scrubbed up very nicely indeed. First port of call was the non-functional scope. This receiver has a proper CRT style scope with a high voltage power supply. Inspection of the power supply board revealed a diode which has deposited a nice amount of soot on the board, along with a blown fuse. The power supply board was recapped and the diode replaced. The board was further cleaned after the pics below, with additional glue removal (although this glue doesn't seem to have turned corrosive like the Sansui glues) : The scope was aligned as per the service manual and now functions perfectly! The DC offset was spot-on, and the bias in the right hand channel was a tiny bit low. She's now 100% perfect in this regard. An internal clean, strip-down of the front face, cleaning and lubrication of all controls, cleaning the rear panel and top cover, and she's looking mighty fine indeed! I doubt there would be too many out there in this kind of cosmetic condition, particularly in Australia. A Sansui AU-717 is included in some of the photos to provide a sense of scale. This is a BIIIIIG unit!
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