Antique Hurricane Bias

Its up to you. These things are a dream to bais havent had to touch the bais at all 8 stay exact. This is the latest.At low levels signgle ended will blow it away but crack the level a bit and Dam.
Needs to be driven with good tube preamp
I purchased a 12000 pair of krell mono blocks to see what im missing. Put them up for sale after 2- 1 hour sessions.
Had the cash the next day. Bought these. God what a diffrence. 2400.00 not bad.

Altec-Lansing 1570Bs...my my. Been a long time since I've seen them mentioned. Had a pair years ago, to drive some electrostatics. They sounded pretty good but they were WAY too complicated, with their transformer-coupled circuitry and something-like-1200vdc powersupply rail.

Does the 1570 use a pentode* somewhere in the voltage-gain circuitry?

*--I recall in the '80s a Tim deParavacini/EAR preamp that used 6 triode sections in parallel to decrease fono-stage noise but then a PENTODE following that.
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yah, the new ones do look better, but I am still skeptical. My ASL 1009's (PP triode monoblocks using a pair of 845's per channel), although sounding great in my system, could NEVER hold the bias properly- I got thoroughly frustrated and sold them (for the build quality, not sound quality issues).

On the plus side though, along with an older modified pair of Altec 1570B 811-based 160 watt tube monoblocks; a buddy's fabulous DIY 211 SET; a pair of recently heard excellent Dehavilland GM-70's; and the ASL 1009's; I am a big fan of higher-powered triode tubes in general...

And yes, I have also heard the Hurricane (original version) on my speakers, and there were several qualities to admire- one of which was the 'presence' those amps created...