Hi everybody
I'm trying to improve my old Sugden C-51 A-51 preamp/amp combo. Then i realized it is not a class A amp as i expected. It runs cold and there 2 pairs of mj12955 and 2n3055 mouted on those big heatsinks. Then i open the top cover and i saw 3 big 2500uf 40v capacitors for each sides. Two of them in series for 0v-35v-70v and one before the speaker output to filter the 35V.
Question 1
Why it's not a class A amp as expected? (no apparent mods)
Question 2
Someone have a schematic of that version of the amp?
Question 3
I will put 5400uf 63v caps instead of those 2500uf for the supply. What kind of capacitors should i use for the output? I've heard there is some audiophile-approved ones...
Question 4
I've order some transistors to try in place of those 3055 2955, Mj15003 Mj15004 and MJ21193 Mj21194. Is it dangerous to try them? How can i adjust them? My boards have 2 potentiometers.
Thanks in advance
Sébastien
I'm trying to improve my old Sugden C-51 A-51 preamp/amp combo. Then i realized it is not a class A amp as i expected. It runs cold and there 2 pairs of mj12955 and 2n3055 mouted on those big heatsinks. Then i open the top cover and i saw 3 big 2500uf 40v capacitors for each sides. Two of them in series for 0v-35v-70v and one before the speaker output to filter the 35V.
Question 1
Why it's not a class A amp as expected? (no apparent mods)
Question 2
Someone have a schematic of that version of the amp?
Question 3
I will put 5400uf 63v caps instead of those 2500uf for the supply. What kind of capacitors should i use for the output? I've heard there is some audiophile-approved ones...
Question 4
I've order some transistors to try in place of those 3055 2955, Mj15003 Mj15004 and MJ21193 Mj21194. Is it dangerous to try them? How can i adjust them? My boards have 2 potentiometers.
Thanks in advance
Sébastien