RE: SET amp with Quad 2905

SET Asylum

Single Ended Triodes (SETs), the ultimate tube lovers dream.

In Reply to: SET amp with Quad 2905 posted by M3hak@hotmail.co.uk on April 5, 2014 at 09:02:44:

The concern is that they are a "reactive" load, where impedance is positively related to frequency. The 57s were very reactive. I don't know about your model, as i have never seen an electrical load and phase diagram. Their impedance varies widely, but that doesn't mean they are reactive unless the impedance rises with frequency across the frequency spectrum. Nowadays, the solution to reactive speakers is to run a SS current amp (with a JFet or Mofset output stage), which is a sledge hammer approach, a favorite of Americans.

In general, lacking more information, best to call upon the experience of 2905 users. The 57s ran well on many fairly modestly powered tube amps.

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Follow Ups Full Thread

Topic - SET amp with Quad 2905 - M3hak@hotmail.co.uk 09:02:44 04/05/14 (9)

RE: SET amp with Quad 2905 - Gordon Rankin 06:34:32 04/08/14 (1)

RE: SET amp with Quad 2905 - morricab 01:41:26 04/09/14 (0)

Maybe this will help. - Michael Samra 23:45:00 04/07/14 (0)

RE: SET amp with Quad 2905 - Frihed89 03:39:12 04/07/14 (0)

RE: SET amp with Quad 2905 - RGA 19:39:29 04/06/14 (0)

I drove Quad 989s with 50-Watt Antique Sound Lab Explorer 805 SETs... - jeffreybehr 19:58:00 04/05/14 (0)

RE: SET amp with Quad 2905 - banpuku 10:33:23 04/05/14 (2)

RE: SET amp with Quad 2905 - M3hak@hotmail.co.uk 12:01:32 04/05/14 (0)

RE: SET amp with Quad 2905 - banpuku 10:34:11 04/05/14 (0)

Follow Ups

RE: SET amp with Quad 2905 - Frihed89 03:39:12 04/07/14 (0)

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