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The eternal quesiton: Tube friendly or not [message #45146]

Mon, 02 August 2004 06:19

roland
Messages: 46
Registered: May 2009

Baron

Hi,

Having read all I can find on tube friendly, damping factor etc, I have the following questions:

If a tube amp has sufficiently low out put impedance (and the resulting high damping factor), I could still be all right with just a couple of watts? It seems that the low damping factor in SETs is the real problem and not necessarily the low power output? After all, if the speaker has 100db/1w/m, 2-4 Watts should be enough, yes?

In for example a PSE arrangement where the additional tube is used for lowering output impedance instead of doubling the power could do the trick??? Example: using 2 x 6as7 (one tube envelope) with for arguments sake a 5kohm primary would yield high enough damping factor to allow for higher Zmax on the woofer...????

Sorry if the quesiton is foolish, but I am really curious on this:)

Roland

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Re: The eternal quesiton: Tube friendly or not [message #45147 is a reply to message #45146]

Mon, 02 August 2004 07:39

Wayne Parham
Messages: 18786
Registered: January 2001

Illuminati (33rd Degree)

That's right, Roland. If the amplifier's damping factor is high, i.e. output impedance is low, then speaker impedance fluxuations won't affect response so much.

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thanks. I like no nonsense answers. (nt) [message #45148 is a reply to message #45147]

Mon, 02 August 2004 08:36

roland
Messages: 46
Registered: May 2009

Baron

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Re: thanks. I like no nonsense answers. (nt) [message #45149 is a reply to message #45148]

Mon, 02 August 2004 09:10

Yury
Messages: 52
Registered: May 2009
Location: Kiev, Ukraine

Baron

hello Roland!
you wrote:
1. "If a tube amp has sufficiently low out put impedance "
if!!!! it's not always. it's depend of scheme, solution. we have to reach it first. the same as transistor amplifier.
2. "and not necessarily the low power output" - it's depend of drivers sound pressure. if you'll load any amp to driver 0.08 Pa - high damping factor of your amplifier don't take a big sound. but 0.4 Pa driver be able to makes biiiigggg loud! :) by 1W
a propos, what do we mean about 1W to 4 ohm? U^2/R. ok. U=2V. nice. signal swing have to be about 5V by oscillograph, couse it's mean square value.
sorry my English.