You never stop learning

Tube DIY Asylum

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

I rotate about ten tube DIY amplifiers (and a couple of commercial SS) to listen music.
While listening to this old project I turned on the smartphone 'audio scope' app.
I have done this since a long time ago with oscilloscope bud this time I suddenly realized this.
On a 40-120 millisecond time interval the audio trace is not always symmetric.
The trace has obviously zero DC but:
- 30% of time it is more positive than negative;
- 30% of time it is more negative than positive;
- 40% of time it is symmetric.
In other words real music looks totally different from test signals...

Omnes feriunt, ultima necat.

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Topic - You never stop learning - cellailuca 04:20:58 05/08/25 (8)

RE: You never stop learning - triode3 03:53:12 05/15/25 (0)

RE: You never stop learning - Leo loves music 07:36:16 05/08/25 (1)

RE: You never stop learning - cellailuca 07:41:40 05/08/25 (0)

A 20hz signal has a 50 millisecond duration. - Chip647 07:36:01 05/08/25 (3)

The traces show a time history 40 msec long - cellailuca 07:57:06 05/08/25 (1)

Then, by my count, the fundamental frequency is about 250Hz. - Tre' 11:47:19 05/08/25 (0)

RE: A 20hz signal has a 50 millisecond duration. - cellailuca 07:51:28 05/08/25 (0)

RE: You never stop learning - tube wrangler 07:05:50 05/08/25 (0)

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