Hi all.
When I meter the G/W to B/W resistance on one of my A470, I get a reading of 149ohms. When I measure the G to B on the same transformer I get 60 ohms. The other transformer has 69 ohms on the G/W to B/W and 60 ohms on the G to B. Does this indicate a bad transformer or is this normal?
When I meter the G/W to B/W resistance on one of my A470, I get a reading of 149ohms. When I measure the G to B on the same transformer I get 60 ohms. The other transformer has 69 ohms on the G/W to B/W and 60 ohms on the G to B. Does this indicate a bad transformer or is this normal?
I re-did these Mk4s using VTA boards, new PS Multi section CE cap (80uF variety), new wiring, tube socket,jacks,binding posts, power cord. The only re-used stuff is the choke, transformers and chassis. Everything worked fine for a while, then a power transformer went out. I bought new PS transformers and after installing them and bringing the amps up on a variac, I noticed one was having a soft intermittent popping coming out of the speaker I had hooked up. After reading one of your sticky posts, it seems the PS cap may be at fault? So I disconnected the wires to it and measured. The square section (40mfd) was shot(couldn't get a reading, just flashing).I had this bridged over to the triangle (30mfd) section and then wired to the B+.Is this a wrong thing to do? Should I just stick with the 30mfd section, or is this just a bad cap? Come to think of it maybe this cap took out my original PS. Would I be better off to go with a PS board instead of the multi section?