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.

Overview

Overview

Roles	Registered
Badges	23

About Me

About Me

Analytics

748

Posts

574

Visits

329

Points

Jun 8, 2014

Join Date

May 2, 2024

Last Active

Reactions

• Insightful 46

  46
• Agree 43

  43
• Like 82

  82
• LOL 13

  13

• Activity
• Posts59
• Comments689

• Re: Help with polk monitor 10a

  pkquat

  April 2016
  Those are Polk drivers from what I have gathered by searching the 6KU 132 number. I am not sure about the following 6 digits. There is are two old ebay listings in this post that reference MW6500. FY…
  1 ·

• Re: Vintage Monitor and SDA Speaker Deals

  pkquat

  August 2019
  Gift them to me in your Will, problem solved. :smirk: How long you got BTW? :tongue:
  2 ·

• Re: Karma-Hafler 220 Amp

  pkquat

  November 2018
  Congrats Viking64!
  1 ·

• Re: The Tale Of 3 Tweeters

  pkquat

  July 2018
  And I thought you were smart (see I didn't use that word), you did it ALL WRONG. You need to replace the foam around the tweeters with the head phone covers because the foam has aged and needs to be …
  3 ·

• Re: Vintage Monitor and SDA Speaker Deals

  pkquat

  December 2017
  Same pair ~$650 price difference. Add about $350-400 to the price for sales tax. :o Needless to say there were a few stock 1.2's and TL's in the midwest that didn't move for months at $2000 and less.…
  1 ·

Next