pkquat

The manual can be found here: https://www.hafler.com/pdf/archive/DH-220_amp_man.pdf The DC offset and bias are covered at the top of page 11. It's been a while so I don't remember the details. diyaudio.com has a few threads on the subject. There is some good info there. For what you are replacing, I don't think values will change. Only make adjustments if the DC offset is over 50mv if I recall correctly. And if the amp is evenly warm, no real need to play with the offset. Too high a bias and you can burn out the transistors. I disagree with the manual about the settling time. It's more than a few seconds. I was also told later that two calibrated MM's make the job easier.

  • Re: SDA 2B or 1C for large space?

    pkquatpkquat
    I do not have 2B's or CRS+, but I do have 1C's, modded 2.3TL's and some 1.2TL's. Base on the 1Cs and the 2.3s, I think the comment about the CRS+ having a bigger sound stage is due to the speaker spa…
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  • Re: SDA-2B TL mod resistors and caps, can't decide

    pkquatpkquat
    The pop as mentioned is likely from an over driven speaker. Some speakers have a softer more indistinguishable sound, polks have what I like to call a clack sound. It is a clear indication the speake…
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  • Re: Monitor 11T

    pkquatpkquat
    Welcome to the forum. :) Just to be sure the two upper 6.5" drivers can sometimes make a clacking sound if they are over driven with very low bass. The 8" passives can sometimes make a buzz…
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  • Re: SDA2 vs SDA SRS 2 vs SDA 1C

    pkquatpkquat
    More info. If the tweeters are black, make sure they do not have a foam ring around them. They are older SL2500 or SL3000 tweeters, and i correct for the SRS 2 and 1C. There is a mod for the SDA 2 cr…
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  • Re: What pisses me off....Power cords

    pkquatpkquat
    @treitz3 Sorry for your loss :'( :s , but that pic did make my day :D . Too bad there was not an America's Funniest Pictures show, or the luck of that shot didn't expand to the lottery. You might hav…
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