|
Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
|
|
|
Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
|
In Reply to: Re: rated power ... and CD players posted by Joelt on November 19, 2003 at 06:47:38:
When you look at the CD output by an accurate VU-meter, you can see that an "average" CD (say pop/rock genre) is mastered usually with "average loudness" about -10...-12 dB and that peaks "jump" to 0 dB VU = 2 Vrms. If you design driver stage with A=100 (for 2A3) or so you`ll have a nice (tube :-)) compressor/limiter and distortion generator if you don`t use your volume control a lot. My design opinion - input 2Vrms, output 32 Vrms (for 2A3, again) with, say, 3...6 dB of headroom for poorly mastered CD`s.
About the driver and it`s distortion - you can`t see it isolated (without the rest of the amp) and distortion figures of 1% or similar don`t have much value. More important is the disposition of the harmonics and their interactions with distortion of the output stage. The low (measured) distortion can sound bad because of "unnatural", or decaying disposition of harmonics. With a multi-stage amp you can discover that (because of the unpredictable sumations and cancellations) your distortion spectrum is chaotic and "peaking" some odd and high order harmonics... (Phase changes, IMD, frequency response, etc. we`ll skip this time).
And again, single stage drivers are possible, see for example Thorsten`s "Legacy" where "ordinary" EL84 can drive 300B (with gain of about 80). And again, work of Pete Millett - "High gm driver pentodes" - amplification, voltage swing and distortion figures (in pentode and triode modes).
But, obviously, you have your vision about "how the things work" and that`s allright. This is DIY.
This post is made possible by the generous support of people like you and our sponsors:
Follow Ups
- Re: rated power ... and CD players - Damir 11/19/0312:17:13 11/19/03 (2)
- Re: rated power ... and CD players - dave slagle 19:09:34 11/19/03 (1)
- Re: rated power ... and CD players - Joelt 20:37:51 11/19/03 (0)
Top of Page ]
[ Contact Us ]
[ Support/Wish List ]
[ Copyright © 2025, Audio Asylum, all rights reserved ]
