Firstly, you can't place anything instead of EL34's in your amp. These tubes are well known for their natural mid-range and voice reproduction. Mullards have the strongest bass among all EL34's but may be very costly. I use in my MB100 EI34 Yugos and I can call it the best budget tube to any EH, Svetlana or Tesla. Stronger bass than Svetlanas and EH together, tonal balance and great highs and midrange. Had a bad luck with EH tubes going bad too fast probably due to the different plate voltage ratings than stock Svetlanas. Additional modifications are available for the amp to use different tubes such as KT90, KT88, 6550 that have much more dynamic capabilities and bring out much more power. It would be too costly and meaningless to send an amp back to US if you don't have any VTL technician in UK, but I believe that these modifications can be done by any tube-literate technician near you or near UK otherwise.
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