LampizatOr GM70 tube monoblock power amplifiers received a major overhaul and became a completely different beast. The original GM70 became the Mk2. The driver tube is 300B Riccardo Kron and the rectifier is Riccardo Kron 5U4G. In Lukasz Fiku’s opinion, these are the best tubes for the money in this application. The main triode is a Soviet graphite GM70 NOS…
