RE: High transconductance tubes sound as transistors...

Posted by Tre' (P) on March 30, 2014 at 08:19:44

In Reply to: RE: High transconductance tubes sound as transistors... posted by Thomas Mayer on March 30, 2014 at 00:48:05:

"If it doesn't sound good it is not the fault of the tube, but of the designer."

In keeping with that;

The single ended stages in audio amplifiers are Class A out of necessity.

Part of the definition of Class A (not the short definition at the beginning of the chapter but the full descriptive definition found in the main text of the chapter) is that for low harmonic distortion, the tube is "only operated in the most linear part of the dynamic curve".

The operating condition (voltage, current, load and max. input signal) will not only determine if the tube is operating in the most linear part of the curve but also how linear and long that part of the curve is.

For low harmonic distortion it's up to the designer to make sure that the tube is being operated in the most linear way possible.

For me, this usually means relatively high idle current and active plate loads that keep the load line horizontal. This insures the tube operation stays away from the non-linear cutoff region.

A designer can stray from this and "color" the amp however he wants to for taste.

At that point the discussion regresses away from science and all bets are off.

Tre'

Have Fun and Enjoy the Music
"Still Working the Problem"

http://www.dock.net/tre/classa.html (Open in New Window)

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Follow Ups Full Thread

Topic - High transconductance tubes sound as transistors... - Aldovan 17:44:07 03/28/14 (16)

RE: High transconductance tubes sound as transistors... - Aldovan 18:20:19 03/31/14 (2)

RE: High transconductance tubes sound as transistors... - Thomas Mayer 22:35:04 03/31/14 (0)

RE: High transconductance tubes sound as transistors... - Paul Joppa 21:22:05 03/31/14 (0)

RE: High transconductance tubes sound as transistors... - Stuben 07:01:12 03/29/14 (0)

RE: High transconductance tubes sound as transistors... - Thomas Mayer 05:27:56 03/29/14 (8)

RE: High transconductance tubes sound as transistors... - Aldovan 19:32:10 03/29/14 (7)

RE: High transconductance tubes sound as transistors... - Thomas Mayer 00:48:05 03/30/14 (6)

RE: High transconductance tubes sound as transistors... - Tre' 08:19:44 03/30/14 (5)

RE: High transconductance tubes sound as transistors... - Paul Joppa 17:46:10 03/30/14 (3)

RE: High transconductance tubes sound as transistors... - Tre' 20:59:49 03/30/14 (2)

LOL...:) - PakProtector 10:20:41 04/04/14 (0)

Excellent post!.. - Paul Joppa 21:15:21 03/31/14 (0)

I 2nd This - Caucasian Blackplate 09:39:47 03/30/14 (0)

RE: High transconductance tubes sound as transistors... - danlaudionut 20:17:27 03/28/14 (0)

RE: High transconductance tubes sound as transistors... - Tre' 18:21:03 03/28/14 (0)

Your comments are similar to... - RC Daniel 18:04:08 03/28/14 (0)

Follow Ups

RE: High transconductance tubes sound as transistors... - Tre' 08:19:44 03/30/14 (5)

RE: High transconductance tubes sound as transistors... - Paul Joppa 17:46:10 03/30/14 (3)

RE: High transconductance tubes sound as transistors... - Tre' 20:59:49 03/30/14 (2)

LOL...:) - PakProtector 10:20:41 04/04/14 (0)

Excellent post!.. - Paul Joppa 21:15:21 03/31/14 (0)

I 2nd This - Caucasian Blackplate 09:39:47 03/30/14 (0)

RE: High transconductance tubes sound as transistors...

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