Matching between triodes - MC-30's

[Audible Nectar]

How closely matched should the triode sides be (within each tube) on a 12BH7 specifically - but on the small tubes in general for the MC-30's? I've been chasing a pair of RCA blackplate 12BH7's, and have had some difficulty finding them. I have located a pair that tests 118/112 (70 min) and 110/120 (70 min), and was curious if tubes with such measurements would be an issue in the MC-30 - or should I keep looking for a better matching pair within sections.

I had a better pair in my sights, but got scalded when the ebay bidding exceeded $180 per pair (OUCH). 12BH7 blackplates must be going up - I didn't know these went for that much $$.

 

[dewickt]

I find that if they match better than a 20% difference the measured distortion is less, did this on the bench with the 1701 distortion analyzer and a Hikok 539C. Also found some new mullard CV4003 and 4004 that checked perfect and gave me 1% THD readings, caused distorted waveform by clipping the top and bottom of the waveform. Measure first than listen, the test equipment doesn't lie !!