Spendor S8e Amp Suggestions.

I had those speakers paired with Quicksilver midmono's (50 watt)and they are a perfect match.

Hi Grimace -
I have the SPendor S6e (understanding they do not go as low as the S8e).

I auditioned two all Tube Amps/Integrated Amps.
The Cary SLI-80 - Great Midrange, voice, and acoustic music - addictive. However, Bass was a bit light, slow - and I found that there was no snap or dynamics as compared to my Quicksilver pre and Classe Amp. So it was a no go for me as I do not listed to Krall, Ottmar Liebert and Holly Cole on every sitting.

Cayin A88T - smaller soundstage, sounded thinner then the Cary and Bass was light as well. I tried it as an Amp only being driven by my Quicksilver and I found it to be a slight improvement. But I quickly went back to my own set up. Still did not have the snap/dynamics that I needed and had some other shortcomings.

I have wanted to go to tubes - but for all the dealers I called/spoke with that carry Spendor (including the one I bought them from) say the same. Spendors need some drive and snap to sound their best and the vintage tube sound though will sound great at first may prove to be limited if you are listening to "harder" music. If you listen to "soft" music, acoustic, female vocals, chamber music then this is probably not an issue.

I'm using Spendor SP2/3s with VTL Tiny Triodes, output about 30 watts, with a passive pre, no less. Great sound top to bottom.

That's interesting.

I called VTL (spoke with Bee) when I was asking about the ST-85 (60 Watts) to use with my S6e = 87db, 6.5 ohms. She told me that the ST-85 would not be enough to drive my Spendors very well. That she would recommend the ST-150.

I told her I do not listen at head banging levels - though I do listen to Incubus, KOL, Radiohead, as well as Jazz - Di meola, Stanley jordan, Krall, some Flamenco....

She said she still would not recommend ST-85 or the Integrated IT-85 either. Now your SP 2/3 may be an easier load to drive then the S series. I am not sure the 30 Watt tiny Triode would be a good match for the OP's S8e.
I can say when I put the Cayin A88T in Triode mode (22 Watts) it was noticeably not enough to drive mine. The Cary I believe was 40 Watts and though it did not seem underpowered had no bass punch or dynamics at all.

Please understand - I am not critisizing your statements or what you are hearing in any way at all.
I can only speak for the S series and my experience.