08-16-2023, 02:15 AM
When I got the 1544As (2008) they came with small pc boards and very clear documentation. Don't know the story now -- there's a new US importer.
When you insert a transformer, you could replace the output cap with the transformer primary, and the matching in that case would probably more demanding then if the transformer was after the output cap. In the tube world I've seen several well-regarded designs where center-tapped autoformers are used as phase splitters before PP output stages following single ended voltage gain stages. I have two Magnequest autoformers designed for just such use. You need the cap before because the autoformers will not take DC, and the output stage, tubes or SS, will often need a cap after the autoformer depending on the output stage bias situation.
When you insert a transformer, you could replace the output cap with the transformer primary, and the matching in that case would probably more demanding then if the transformer was after the output cap. In the tube world I've seen several well-regarded designs where center-tapped autoformers are used as phase splitters before PP output stages following single ended voltage gain stages. I have two Magnequest autoformers designed for just such use. You need the cap before because the autoformers will not take DC, and the output stage, tubes or SS, will often need a cap after the autoformer depending on the output stage bias situation.
