music hall 25.2 DAC mod

Being a noob with tubes, please bear with me.
There is a label from Brent Jessee on the box that has a space for Gm1 & Gm2 and both have a 'check' after them.
Tube type is 6922 and brand is RTC, Mfg. = Mazda. Prod. type = 1971 France.
On the tube itself was a slip of paper with the numbers 27-29 &-18/-18.

Hope that helps and that you get the same results as I did.

On an aside, I tried a '70s Matsushita, from another site, that was touted as a great tube (not from that site but from various sites) with negative results: flat, closed in mids and highs and generally dull sounding and this Mazda is quite the opposite. Open, airy, fleshed out (more body), dynamic, very quiet, with decent bass. Almost organic. The top getter is tilted at a 45 degree (I thought it was damaged at first) and kinda looks like how one would wear a beret.
Fitting for a French tube.

Could someone familiar with this DAC clarify one thing for me?
My understanding is that the balanced output circuits on this unit are solid state and the single ended circuit goes through the tube. Is this correct?

Nonoise - thanks. I was really just wanting to know if you had the actual Gm data or the check marks (because I thought it was strange that mine had the check marks on the label and no actual data). Looks like you got the check marks too, which tells me that it must be a fairly standard/common way for him to do the labels.

This was my first tube purchase, so I'm new to tubes too.