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Discussion Starter · #1 ·
Just pulled the trigger at JandR and should have the HK525 next week.


Anybody opened one of these up and have some pictures/descriptions? Not that I'd ever void my warranty :) but these are some mods I think could help the 525 for my setup:


1. THE FAN. Either disconnecting or replacing with a quieter one. If nobody knows what type is in there, and what the power to it is, I'll have to research it myself. After you read #2, you may understand why this doesn't seem to risky to me to just disconnect completely! Remember the HK520 was very similar, but only had 5 channels from the same PS, and needed no fan.


2. DISCONNECT AMPS. Yup, this will be a pre/pro for my separate amps, and if there is an easy way to disconnect the amp section from the power supply to turn it up, I'd like to try it. Of course, if this can be reconnected later it would be best. Improvements that I might expect: less interference to the pre/pro section, less heat generated, less power consumption, and more power available for the pre/pro.


3. HEADPHONE JACK. I'm going to AB the HK against $500 and $2000 headphone amplifiers that a friend has using our Senn HD600's and see how the HK jack stacks up. Ways to improve the jack depend on what's inside of course. An easy way would be to use the 6&7 channel amps (ie using a/b speaker selection to turn on) through a resistor network to drive the 300ohm load of the HD600. Another method could be to replace the existing circuit with upgraded op-amps, caps, and resistors if the board is setup that way. Or even just stick my own design like a META42.


Anyone else tried stuff like this? Any help you can offer? Anyone else interested in trying projects too? I'd like to put my engineering degree to some use, but without a roadmap to the internal guts I might be lost.
 

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(1) The only time I've ever managed to get the fan to come on was by putting a blanket over the reciever (did this to check it was functioning) - never got it to activate under normal use, at extreme volumes.


(2) Why are you doing this? Why not just buy a good pre/pro?


- Rick
 

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Discussion Starter · #3 ·
2) Cause a good pre/pro costs a lot more. I considered used, but most were missing new formats. Outlaw is the only option in this range, and I'd much prefer the HK. Rotel 1066 is 1500, so even haggling won't get lower than 1300. At half the price, the HK sounds good to me!
 

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Inf, there's not a lot of advantage to disconnecting the amps, especially if there are removable pre-out/amp-in jacks. With no speaker load, the amps will develop no discernable heat, even at a large volume setting (high voltage output). Open circuit = no (okay, very little) current, which equals almost no wattage, only idle current. Disconnect the fan and don't worry about it.
 
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