How close are these ribbons to your ear and how large are they? Not sure you need, or want, 150 watts pumping into what are essentially headphones. I didn't see anything like what you're referring to on the Raal site.
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I talked to RAAL after the amplifier power needed was specified in every review. They did verify the 150 watt solid state, 100 watt tubed amp requirements. I probably should have pointed out that the RAAL's come with a special interface box which presents a 6 ohm load to the amplifier, and whcih the SR71a's plug into.
The ribbon speakers are 3/4ths to an inch from your ear, and are honestly very different from anything normally labeled as a headphone.
Thanks for the BAT recommendation. Thats a very good amp, at an excellent price. However, BAT's are fully balanced designs and not ideal being used single ended with adaptors. I've spoken to BAT in the past, and they strongly recommend sticking to balanced electronics throughout the chain when using one of their amps.
I would buy, if going vintage, a Sansui of the alpha series....I own a Sansui alpha and one Au-7700....I love them....Any big Sansui of the series AU also will do the job at a low price...My Sansui AU 7700 is detailed and sound like tube...A bigger one of the AU series will have the same sound...A recaped one at lower price than the price the OP is willing to pay is possible...Just right now on EBay ( around 1000 dollars) there is a Sansui 11,000 rated officially110 watts, but my 7700 is officially rated 58 watts and my tech rated it 80 watts....Sansui create some big machine of the highest quality for their times and even compared to now....
With the remaining money buy a big lithium battery and go off the grid....
Thanks Tweak1, appreciate the recommendation. I read through the discussion you started about it, and it was interesting reading. I may have missed something, though, but did you ever receive the LSA Gan 200 that you hoped to compare with it? I am very curious about that technology, and that amp as well.