Posted: Mon Feb 13, 2012 6:53 pm
Hello folks,
This discussion has been really fun to follow along with and try to understand. I had a SCA-35 back around 1977, for a short time. Since I also had the PAS-3/ST-70 combo, I gave the 35 to a friend, who was poor and needed some tunes. Next time I saw him and asked how the amp was working, he said it had developed a problem, so he threw it out. Threw it out! With what seems like a revival in interest in EL-84 amps, I’ve been looking for a Dynaco, but haven’t stumbled on another one in all these years.
But, since all this talk has been so exciting, I stopped waiting and ordered a diy kit from Triode. Figure on building it with the EFB mod ground-up. To keep it simple for my simple mind, the one-pot bias adjustment will do fine. So there will be a lot of leftover kit parts. Hope to find the mod parts in town this week before the kit arrives.
One thing I want to double-check is, in this one adjustment scenario, what should I do with the existing 470k grid resistors (R13-16). Should they be installed as directed, pairs joined to ground? Like Geezer said, I’m a paint by numbers technician.
Thanks in advance.
Carl
This discussion has been really fun to follow along with and try to understand. I had a SCA-35 back around 1977, for a short time. Since I also had the PAS-3/ST-70 combo, I gave the 35 to a friend, who was poor and needed some tunes. Next time I saw him and asked how the amp was working, he said it had developed a problem, so he threw it out. Threw it out! With what seems like a revival in interest in EL-84 amps, I’ve been looking for a Dynaco, but haven’t stumbled on another one in all these years.
But, since all this talk has been so exciting, I stopped waiting and ordered a diy kit from Triode. Figure on building it with the EFB mod ground-up. To keep it simple for my simple mind, the one-pot bias adjustment will do fine. So there will be a lot of leftover kit parts. Hope to find the mod parts in town this week before the kit arrives.
One thing I want to double-check is, in this one adjustment scenario, what should I do with the existing 470k grid resistors (R13-16). Should they be installed as directed, pairs joined to ground? Like Geezer said, I’m a paint by numbers technician.
Thanks in advance.
Carl