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Title: DC30 Issue Post by: GregN on March 20, 2014, 12:54:43 AM EDIT: SOLVED. It was my 500pf coupling cap. Replaced it and all is well!
Hello, I am currently wrapping up a DC30 type build. I am currently in the testing phase and have one (hopefully small) issue on the 12ax7 channel. Everything is fine on the EF86 channel- better than fine actually Surprised On the 12ax7 channel, when I start my volume at 0 and work my way, everything seems to be fine for the first 5% of the rotation. The pot tapers very quickly (too quickly? definitely more so than the EF86 channel) to a steady volume, (I'm going to call it a clean sweet spot) and then there is no more gain available. For about 90% of the pot range, it sounds the same. Then, close to the maximum setting, I lose all sound on the channel- similar to when my pot was at 0. I've already replaced the pot with a new, verified one. The original tested fine when I pulled it out. I've also replaced the 180pf cap between pin 1 and the pot wiper... Not sure where to go from here. Any help is greatly appreciated. Thank you!! Greg |