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In Reply to: RE: Linear Tube Audio - ZOTL 40 posted by lancelock on June 19, 2016 at 06:01:12
Although I am currently completely happy with my NYAL OTL3, I do worry that it may die before I do, and wonder what might be a viable replacement. Someone recommended a Berning amp to me some time ago, but I am certainly not able to spend $75,000. perhaps two ZOTL-40's would work. Tthe website says one can use speakers with impedances between 4 and and 16 ohms. My Stax speakers, in addition to being very inefficient, have an impedance curse that varies between 4 and 130 ohms. I wonder if this combination would work.
Follow Ups:
Linear Tube Audio has a fair trial policy but you won't want to send it back. I use the ZOTL40 to power my JansZen electrostats and I have more power than I need. I cant say that about other 40 watt tube amps I've tried. I'll bet 2 of them would do it for you. I have also found that NOS Mullard tubes in this amp brings it to an incredible level.
As soon as I get a good buy on the Harbeth 40.2 I'm getting a pair. I dont know how much power they require to sound good, but which one of David's asmps would do very well? How much power do the Harbeths need?
I wish I could afford an appropriate ZOTL for my ESL-57's.
I have pondered occasionally the idea of building a DIY version of a ZOTL amp. I'm not usually very keen on the idea of hybrid amps, but in this case, although the speaker current is all flowing through the switching mosfets, there is arguably a rather close correlation between the audio current flowing through the tube "drivers" and the (averaged) current flowing through the speakers via the mosfets. Maybe I'll have a go some day.
The tricky thing with a DIY ZOTL would be sourcing and / or designing and making the inductors / transformers, I would think.
Yes, I agree that is probably the trickiest bit. But the technology is in many ways similar to switching-mode power supplies, so maybe one can scavenge from old computer power supplies, etc. New windings on old cores.
Edits: 04/06/18
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