Lower B+ (turn down variac so that b+ is only 350).still oscillates, tubes still get blue/white "flashes" I feel like I've checked over most of what I knew could cause it. I'll post the schematic, if someone could help me cross some stuff off the list I'd be thrilled. If I unhook the front end and just leave the 6BG6's hooked up just like this, at 50ma bias, they will sit there stable all day long. Get the CCS set for too much or too little current on the first 6SN7 for example, and it oscillates. It's very sensitive to the rest of the amp. The bias/current draw on the tube oscillates between the quiescent 45ma and about 75ma. You know the type, blue flashing in the tube. I am getting some oscillation problems in the 6BG6's. The 6BG6GA's are negative biased, with 75K grid resistors. Voltage amp/phase splitters are LTP, CCS, 6SN7. I have built from scratch this Push Pull 6BG6GA amp. I'm hoping to get a little advice, and know there are many of you here more knowledgeable than I
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |