Croft 25 Cathode Follower?

[Macca]

Thanks, Martin. My understanding is that the 25RS line stage circuit is different from the 25 and 25R, using an 12bh7a valve rather than an ECC83.

Does this also mean that the output impedance of the line stage in the 25RS is lower (because modified cathode follower circuit is implemented?) than 25/25R? And the question is how can I check? It would greatly increase my range of power amp choices if so.

I'm not aware of any SS amps with input impedance as high as 470k.

I could not find any info on the output impedance of the 25, 25R or 25RS. It will be high as with all valve pre-amps which is why the 7R has such high input impedance.

Really, for the sake of removing one not very large box I'd stick with the Croft Monos, they're designed to work optimally together. The other option is to sell the lot and go to an all solid-state integrated. That way you'd ditch two boxes. Never any problem to sell Croft, someone will have your arm off for it.