high-amp Posted November 7, 2011 Report Share Posted November 7, 2011 To all the owners of a transistor amplifier V3.0 from http://www.high-amp.de out there in the world. Here is a support how to update your amplifier to the version 4.0 that will be coming out soon. The items below are refered to the following schematic: http://high-amp.de/html/transistor_v3_schematics.html - replace the four resistors R07x and R08x with 51K/1W resistors to increase the current in the second stage to 4mA - replace the two resistors R11x with 200 ohm resistors to increase the current in the last stage to 15mA - replace the resistors R56, R57 by a constant voltage source as shown below (one per chanel) - If you are using the 2SC5466 in the last stage replace it by the 2SC5353 (Q06x). The 2SC5466 can not handle 15mA because of the nonlinear hfe-curve above 10mA (bad performance especially in high frequencies, missing resolution). What do you have to expect from the update? You will improve your amplifier significant to a very fine resolution over the complete frequency range with very deep and structured basses and an excellent reproduction of high frequencies. I would warmly recommend to you to perform this update. You won't regret. Quote Link to comment Share on other sites More sharing options...
crappyjones123 Posted November 7, 2011 Report Share Posted November 7, 2011 (edited) dude that is awesome. i only have 51k/10w resistors though. can i cut them in 10 pieces and use the individual pieces? i cant wait to have very deep and structured basses. i dont want to regret. please respond fastly. ok? Edited November 7, 2011 by crappyjones123 Quote Link to comment Share on other sites More sharing options...
grawk Posted November 7, 2011 Report Share Posted November 7, 2011 There's no need to haze a MOT who's just here to tell people how to update existing products for free. I don't know that anyone here has one of those amps, but there's no harm in this information, I think. Quote Link to comment Share on other sites More sharing options...
high-amp Posted November 7, 2011 Author Report Share Posted November 7, 2011 Hi crappyjones123 send me your resistors and I will see what I can do for you. Hope my response was fast enough for you. ok? Quote Link to comment Share on other sites More sharing options...
crappyjones123 Posted November 8, 2011 Report Share Posted November 8, 2011 Nod. Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted November 8, 2011 Report Share Posted November 8, 2011 - replace the resistors R56, R57 by a constant voltage source as shown below (one per chanel) ?? Quote Link to comment Share on other sites More sharing options...
high-amp Posted November 8, 2011 Author Report Share Posted November 8, 2011 Here the lost constant voltage source. Quote Link to comment Share on other sites More sharing options...
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