tone controls

A couple of years ago, @kward started this thread: https://audiokarma.org/forums/index.php?threads/thinking-of-building-a-low-gain-preamp.783332/ In response to that thread, I ran a couple of experiments with a 6080 that showed some promise, and then promptly put the idea at the tail of the...

Hi everyone, Still a pretty new member so please forgive me if this thread is not properly located, but I found similarly-themed threads in the Solid State category so here goes. I'm having several components of my stereo looked over by my very capable local tech as I'm currently in the...

My Marantz 2230 just lost tone control. The sound became very thin, and none of the bass, mid, or treble pots have any effect. It affects both channels. Volume works fine and the loudness contour still has an effect when turned on and off. I've not noticed distortion, although it's so thin...

Well I enjoy my NAD 7240 so much (after diagnosing problems thanks to members here) that I got another one. Unfortunaely this one has much bigger issues. Symptoms Very low sound from any input - about 60 db at full volume. Did some tests. Used pre-amp on another amp and nothing changed...

Hi Guys and Gals, I have a Dynaco Pat 4 I would like to convert to tubes, but many of the controls (which are quiet and track well) are different resistances than the circuits I would like to try. Is there a way to figure out which other values need to be changed in an existing circuit to...

Picked up my first Sansui piece the other day. All I did day one was verify it powered up and was not in protection mode. Day 2 involved deoxit on as many switches and knobs as I could reach with the cover off. When I was done I hooked it up and at low volumes and tried it out. Everything seems...