Contrast/compare 50W tube amps

You should add Quicksilver Mid Mono's to your list. They can use EL-34, KT-88 or KT-90 tubes and output between 50 and 60 watts. By trying different tube combinations, you can achieve almost any type of sound you desire. I currenty run a pair with Mazda 12AX7's, Amperex 6922's and Grove Tube EL34's. I've rolled over 30 combinations of tubes and this is the setup I like best.

The EL-34 based amps are certainly sweet,but lack top-bottom extension.Though like the midrange.
I am sorry to say that CJ gear has a signature and doesn't resolve down to the noise-floor.Have had their units in,while having equipment repaired.It glazed over some information IMHO.
I am heavily leaning toward a less used (unfamiliar sounding??) tube output (6C33C-b/GM-70).
The revised Gallo is a detailed ,somewhat ruthless speaker,the OBs have more "body" and fullness (will post a picture soon).
Thank you for ALL the contributions ,so far.
Still no OTL comments??

OTL's, as a general rule, can sound stupendous. That is, so long as they are VERY carefully mated to the loudspeaker & cabling that they will drive. The higher the nominal impedance of the speaker, the better the OTL will work. The lower the impedance of the speaker, the more that the reactance of the speaker will "modulate" what one hears. Most would refer to this as a lack of "damping factor", but what it really boils down to is a lack of available current in the output stage of the amp.

If you look at the power output on most OTL's, you'll find that their power output actually goes UP as impedance climbs, which is the exact opposite of SS and most tubed gear ( to a certain extent ). As such, a 6 ohm nominal impedance may be too low for most OTL's, even though the Atma's are nice amps. I say this because most speakers that are "nominally rated" at 6 ohms will typically dip to 4 ohms or less. The "nominal" rating simply means that the average impedance "balances out" to the rated figure, taking into consideration the various peaks and dips involved.

Other than that, you might want to look at the availability of any tube that you'll be using. Are there lots available? Different brands to experiment with? What do they cost to replace? How hard is it to convert the unit from one type of tube to another? All of this comes into play if you intend on keeping these amps for an extended amount of time. Sean
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OTL + seas + disaster.
Glad I could see a comment on the EL34's, "lacks top/bottom".
seems i got very lucky with my Jadis OR and her KT90's. seems 90's give best extention in bottom and highs. I've heard several 88 amps, bland.

>>I've heard several 88 amps, bland<<

Perhaps they do not match well with your speakers but, for the most part, KT88 tubes and the amps that are based around them, are not "bland". You need to get outside of the Seas box that apparently constrains your thinking.