: They require specific "current pusher" tubes with low plate resistance, such as the 6AS7, 6080, or 6336 .
: Indicates the total absence of these transformers in the signal path. 2. Why Go Transformerless? tube tranny free
: A classic "totem pole" design where tubes are stacked to pull the signal positive and negative. : They require specific "current pusher" tubes with
: Eliminating several pounds of iron and copper makes the units significantly lighter. 3. Key Design Challenges such as the 6AS7