Most powerful and popular EL34 tube amp?

Take a look at Audiovalve Challanger 180 monoblocks;you can run EL34,6550c and kt88's as they autobias.

How many EL34's do you have?
You are going to need 8 (or more) for some of these amps.

I have 4 almost new Siemens EL34 tubes and a few more (4~6 Russian/Chinese) variants. If I go for monoblocks, sure I need to use 8 or more tubes, but I'd rather stick to a single steroe amp.
It might not save me whole a lot by sticking to EL34 tubes, so I would rather look for some other options too.

Thanks for all your responses.

I have heard the Ars Sonum at Merlin Music Systems and I was pretty impressed with the sound. I think it was about thirty watts but it did not sound like 30 watts to me at least. I believe that is an EL34 powered amp. I think it is lead free

The VTL Compact 100 monos come up from time to time and they are excellent amplifiers for $1,000 depending on condition and age of tubes with 4 EL34 output tubes per amplifier.

I used them to drive full range electrostatic speakers. They should drive your 89db speakers with ease.