You mean a single chain of 18? Probably, grid losses would be too large for that. Whereas the delay lines can be made to match... with difficulty.
Hmm, insights I didn't have last time... interesting.
I'd have to check datasheets and see what GBW is like, but it seems likely they obtain more total bandwidth and gain this way, than by ganging stages. The plate-line loss should be quite low, allowing it as a single chain.
The bandwidth and power make sense given how many tubes are required regardless, while a distributed amp gets the bandwidth up, something a single or couple big transmitter tubes can't do.
Tim