Recent content by Wntrmute2

But even with the feedback network disconnected the gain on the second stage is down compared to the first stage. Any thoughts? I would expect the second stage to be higher than the first.

Well, No real change after disconnecting the cathode bypass. I guess the waveform isn't as clipped but still weird readings as far as I can tell.

Can you explain what is going on? Seems weird. I tried disconnecting the feedback circuit but that really didn't change anything. Why would my output PP voltage be 3.2V while my first stage output voltage at the 2C22s is 5.1V pp?

Plate Voltages are 104.9 and 102.8 for the #76s Plate Voltages are 112.7 and 110 for the 2C22s Cathode Voltages are 4.1 and 4.1 for the #76s Cathode Voltages are 3.8 and 3.9 for the 2C22s Cant really measure the grid voltages. Waveform is still flattened at the outputs (Positive deflection...

I saw that video and that is why I set my probes to 10X. Didn't really understand why but did take his recommendation.

OK, I resoldered the feedback resistors in. With the higher B+ the waveforms look better bit still flattened off quite a bit over 2.8V PP. Interestingly, the waveform looks much better after the first stage than after the second. Could the feedback circuit be causing this? Blue trace is after...

I had those same tubes as well as a pair of the EML meshies. The Sophias looked spectacular but only lasted for a short time as did their replacements. The 2.5V filaments are vey dim even within the mesh plates.

I was wrong. Those were the feedback resistors I clipped out. Stupid shit I am! Now, back to fixing my mistake.

Well, my resistors ARE on the wrong side of the final coupling cap. Will need to figure out the best way to remedy.

I have to straighten my incredibly cluttered bench before doing anything else. Will get back to to tomorrow.

I'm so sure of the JJs that if you don't like them I'll buy them off you as long as you buy them from a reputable vendor like Antique Electrical Supply or the equivalent

There is really no tube glow that I can discern even with the EML. Paul's experience is worth considering.

I really dig those JJ 2a3-40 tubes. The sound as good as the EMLs IMHO. Rugged as well!

I think all that noise came from incorrectly loading if the preamp. Does that make sense? I haven't tried the different VR tubes yet. Was attempting to understand what was in front of me with the lower B+. I'll try that tomorrow. Thanks Paul!

Thanks Derek. Trying to learn something on multiple fronts here. You are a big help!