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bevensee 22nd February 2014 03:04 PM

kt88 and Martin Logan, any experience?
Hi all,
I am considering building the kt88 amp to drive my Martin Logan Vantage speakers, but I am concerned that the inpedence drop to the 1-Ohm region at high frequencies will course a treble roll-off.

Does anybody here have experience using the kt88 amplifier for Martin Logan or pther stats?

Has anybody measured the output impedance of the kt88 at high frequencies?


justin brown 22nd February 2014 05:41 PM

Re: kt88 and Martin Logan, any experience?
Hi Jesper,

I cannot give you a definitive answer to your query, but you could try sending Colin (Toppsy) of this forum a PM. He has modified and built electrostatics, as well as an array of different valve amplification, so he would be the best person to approach.

I use the 300bpp stereo (albeit a clone of the original) and use modified Quad Esl63s, so cannot really comment.


bevensee 22nd February 2014 05:57 PM

Re: kt88 and Martin Logan, any experience?
Hi Justin,

Thanks for the suggestion. I will try PM'ing him.

vitalstates 23rd February 2014 10:16 AM

Re: kt88 and Martin Logan, any experience?
hi bevensee

It's not an exact science in my experience. I have run my ER3 stats for many years with a KT88(30-40watts), and found the combo entirely satisfactory. However, I used a WAD 6550 for some months with the same speakers and that was entirely unsatisfactory, I never did like the presentation. I have used SS muscle amps in the past but they never delivered what the KT88 does.....

I can't speak for the exact combination but you're probably on the right side of the risk equation.

speakers here:

bevensee 23rd February 2014 02:22 PM

Re: kt88 and Martin Logan, any experience?
Hi Vitalstates,

Thanks for the comments. I am leaning more and more towards taking the plunge...

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