About 8 years ago, Glenn upgraded my Micro A preamp to 25RS spec, with a separate power supply box. We didn't discuss much technical detail - he just said he'd take it to the current 25RS spec, with the phono stage circuit from the RIAA RS. I've always been delighted with it and have no intention of parting with it. However, I am thinking of downsizing from my 7R monos to something a bit more compact - probably solid state. So I'm wondering about power amp compatibility. I understand that the "cathode follower mod" that Glenn used to do reduces the 25 output impedance, helps with that. Is there any easy way I can tell if the work carried out by Glenn included the cathode follower mod? Is it by any chance related to the use of the 12bh7a/ecc99 in the line stage?