kt88 and Martin Logan, any experience?

[bevensee]

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?

thanks,
Jesper

[justin brown]

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.


Justin.

[bevensee]

Hi Justin,

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

[vitalstates]

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:

http://www.vitalstates.org/diy/elect...trostatics.htm

[bevensee]

Hi Vitalstates,

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