Wig, I use a pair of Mirror Matched RCA 5814A from the 1950's. These tested very low Mic. and are the 3 Mica type. I got one set from Andy at Vintage Tube Service and they sounded so good I got a second set as backup. I am still using the first set after 4 years.
I switched out the Mullards CV4003's and put back in the 1950's GE 5814A BP triple Mica and the speakers really opened up with a more natural presentation. I can easily hear deeper into the soundstage.
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