GM70 is very popular tube in Russia and any more or less serious Russian audio person at one period or other made or own GM70 amp. (...) So, when you talk with Russians high-enders it is very common subject for them: GM70 copper plate vs. graphite plate, GM70-type of sound vs. 6C33C-type of sound, GM70 at 800V vs. GM70 at 1200V and so on… |
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