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Which Speakers are Best for TUBE AMPS 70wpc?

Posted on March 27, 1999 at 23:04:58
Tube Guru

VR's, FARELLA, MordauntShort any ideas?


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electrostats, posted on March 28, 1999 at 02:44:35

between the capacitive impedence and the low excursion, they are absolutely made for tubes.


Re: electrostats,WRONG!, posted on March 28, 1999 at 08:06:12

Tubes like resistive loads not reactive, the more resistive the better!
Magneplaners are a one good choice. The driving element is just resistive.


why would a current-source care?, posted on March 28, 1999 at 09:48:40

Isn't that a tube's beauty. They deliver the same current reguardless of load. And, since SPL is much more a function of current rather than voltage, these sound ideal and come highly recommended.

I know SS's are absolutely finicky about impedence w/o a single doubt. Although, some FETs are more unforgiving of fluctuating impedence, some more than others (eg: Dennon's are really picky).

BTW, for what it's worth my Maggies are no where near flat yet. I plan on fixing that. Don't get me wrong, the drivers are practically purely resistive. The XOs however greatly alter that.


Re: why would a current-source care?, posted on March 28, 1999 at 12:59:01
Dave B

Speakers are voltage driven, they demand more current during low impedance excursions. This tests the power amplifiers power supply reserves.

Tubes are voltage devices and generally need transformers for getting output impedance down and current up, unless, you have lots and lots of output tubes in parallel, like in an OTL arrangement. Generally and ideally speaking, you would want a constant voltage source with an infinite current supply ability.

A loudspeakers fluctuating reactive load is more of a test of an amplifiers stability and ability to resist oscillation. This is a test of the amp designers skill.


Re: Which Speakers are Best for TUBE AMPS 70wpc?, posted on March 28, 1999 at 17:21:21

My original Quad ESL's really love my VTL's, -great match, wheather it's the Renasance 70's or the Compact monoblock 100's. I did't get enough gain from my little Luxman 64 tube amp though. I've had MaCentosh tubes on them but they were to sweet and nosy.


Spendors, Maggies, ESP, Gallo, various horns...(nt), posted on March 29, 1999 at 04:41:19
Jack G



does this mean..., posted on March 30, 1999 at 12:10:39

that a tube amplifier would wants a huge iron-core choke in its rectifier to supply a tube with near constant current like a SS wants a capacitor for a passive constant voltage device?


Re: Which Speakers are Best for TUBE AMPS 70wpc?, posted on April 1, 1999 at 09:36:39

My Dunlavys are very happy with my 70 wpc tubed amp.
4 Ohms nominal
91 SPL


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