SE DC 2A3 beta follower : problem with right channel ...

Tube DIY Asylum

Do It Yourself (DIY) paradise for tube and SET project builders.

I checked the left channel of my SE DC beta follower circuit and it measures a lot lower in THD vs. the right channel.
The right channel has some kind of instability because the THD will go up and down by 1% while the left channel remains constant.
Here is the spectrum graph of the left channel. Looks better.
2nd harmonic : -35.5dB
3rd harmonic : -43.8dB
4th harmonic : -66.5dB
5th harmonic : -69.6dB
Now I have to determine the cause of the problems with the right channel.
Update : I found the problem with the right channel.
First, I swapped 6SN7's between channels. No changes.
Next, I swapped 2A3's and the distortion on the right channel was about the same as the left, 1.72%THD at 1W.
I'll keep the Chinese 2A3B monoplates for testing and other abusive activites, but I am in the market for a better set of 2A3's.

Edits: 03/29/14

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Topic - SE DC 2A3 beta follower : problem with right channel ... - deathtube 667 10:01:05 03/29/14 (2)

RE: SE DC 2A3 beta follower : problem with right channel ... - Michael Samra 10:31:36 03/29/14 (1)

RE: it was a bad/defective 2A3B... - deathtube 667 10:51:01 03/30/14 (0)

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