6550 tube vs KT88

Thanks Tvad I'll order that issue. I think the issue here is that my Seas speakers area MTM design rated at 87db, so its just not a match for the KT88 I demoed nor the EH88's that I rolloed in my JOR.
db rating must be 90+ to be effective.
This is the one drawback with Seas speakers, few tube amps can bring out the dynamics. The Jadis is one that can meet these demands, as their web site says, "our amps can drive any speaker" and they can. I've put their smallest amp to the test.
Not sure how the Jadis 88 tubes image? vs the 90's I'm using.
The thing is, if I order a Jadis amp in the future, I may just stay with the 90, as I like the sound. And may not be willing to give up the characteristics of the 90 in order to gain some benifits of the 88's or 6550's.
Trade off's are a part of this audio realm. But if it isn't broke, don't fix it.

Bartokfan,

>> I think the issue here is that my Seas speakers area
>> MTM design rated at 87db, so its just not a match for
>> the KT88
I do not understand this convoluted logic! what does 87dB SPL/W/m have to do with compatibility with KT88 output tubes?

what is the bias voltage set at for the KT88 tubes?
(for example, in my 502A the recommended bias voltage for 6550 tubes is 50mV. However, KT88 work better in this amp when their bias is set at 55mV i.e. driven slightly harder).

As far as I can tell: you do not have sufficient power amp output wattage to drive is mid-low efficiency speaker. Correct?
If so, please do not blame your lack of output power wattage on the sonics of the KT88!

Tvad, I beg to differ on a nit. Bartock fan does "know wtf" he's talking about. He understands himself perfectly. The problem is that nobody else does!

Perhaps in his ability to judge the performance of tubes sans amps (other than his JOR) and drivers without speaker systems (other than his Thors) his is an idiot savant, perhaps sans savant. For the life of me I don't know why anyone evens bothers to respond to his posts, they always evolove into a testimonial for KT90's (since I guess he decided against the KT88 based Cayin) and the superlative Seas drivers. I believe that is his initial intent when he posts. Too bad the word introspection is not one with which he is familar. If it were not so sad it would be funny.

IMHO, FWIW, Amen, All praise to Allah, and God Bless America............