ST-70 MONO, STRAPPED. Old question, asked again-- looking for new answer

I'm an owner of two beautiful sounding fully refurbished including triode mods, etc. I know what the manual says. I know what the experts have said regarding my question. I've read all ( I think) threads on this topic.

I run two st-70s, strapped in mono mode with BOTH inputs (using a y splitter/combiner) and they sound fantastic. There is no doubt to my ears this IS the best the old ST-70s can sound.

Please don't just cite others if you don't have a technical answer WHY this might be the case. This fortuitous discovery in the very least should be spread throughout the Dynaco community-- I'd like some logical explanation to back up the magical sound from mono ST-70s.

If the outputs feeds separate speakers, thats fine. But if the outputs are interconnected then
any unbalance in the two amps will cause distorsion since the "weaker channel" will act
as loading and the "stronger channel" will be bogged down by the combination av speaker load and
a weaker partner.

If the outputs must be tightly coupled, i think the minimum would be common feedback, but
i still don't see how it could balance dissimular tubes.

One exception would be a bridge-coupled pair, then one of the pairs needs to have a phase inverter in front.

In theory it should sound worse...I get that. It is, however, substantially better sounding in mono, using both inputs.

I'm looking for some scientific explanation that the opposite of what you'd expect to happen, actually happens.

Yes, 16 ohm taps are strapped. (And common)

I'm closing in on a single two-way speaker project, and would like to use (modify) a stock-circuit ST70 for monaurol reproduction for bass guitar and general instrument amplification.  The goal on the speaker is a full-range bass guitar speaker that can also be used for a modern polyphonic keyboard with an array of "instruments" or even to mic a cajon or conga.  

I can picture a "Y" to utilize R and L channel inputs, but I would appreciate a diagram on how to use both outputs to power an 8 Ohm cabinet.  (Eminence Legend CB15, crossover model=PX21k6, and PSD:2002S-8 tweeter

Thanks in advance!

I think that perhaps if one is really set on mono, and of course depending on the output you're after, look at used MKIII mono blocks. Even if it needs some rework, you'll end up with a ground up designed mono amp giving you quite a good output.
It would also be relatively easy to install a volume control on a MKIII.

Thanks.  Yes, I understand I would be making it do something it is not designed (well) to do.  A MKIII or dedicated mono build may be in the future.   It's just that I have an ST70 and will try it even with just one channel for a while.  

Also, I want to understand how to bridge the outputs for an 8 ohm cabinet.   Hoping someone can explain.  I've read the manual and think it makes sense, but without a diagram I'm not sure.

Do I need to reinstall the "mono" switch per the original schematics?

Do the two yellow leads (16 ohm), one from each channel get used as + and - for the speaker?