I inherited a 60's era Heathkit TA-27 about 20 years ago, and have only recently decided to refurbish it and get it up and running. I found a thread on this forum, (you can find here: https://www.guitarscanada.com/index.php?threads/heathkit-ta-27-tone-question.55131/ ) and was hoping to tap some of the knowledge of members here that are familiar with this amp. The linked thread mentions some updates that can be made, and I have done them. I replaced all electrolytic caps, replaced Q2 and Q5 with 2n5089 transistors, and updated my power cable. The amp works now and sounds good except for some distortion which is present at any volume. I have ruled out the speaker or any vibration making the noise. I was wondering if anyone had knowledge of this amp and could point me where to look to eliminate the distortion. I thought it might be a bad 2n5089, but I don't know.