My friend is using a pair of Lumley mono blocks to drive the original VR4 speakers and using an original Conrad Johnson pre amp from the 1970's.Talk about retro sound.
I can't remember the model number of his Lumleys, but they use 4 KT88's a side and have beautifully engraved casework which almost looks like it's made of smoked glass.
I sold him one of his 2 sets of Grant Lumley amps that were very nice sounding el34 amps which he was running biamped on the VR4's before he got the bigger amps.
I was told the great Lumley sound was because they used(sowter?)great transformers.
Enjoy them, they keep on running year after year.