dragonworks
Banned
an output transformer? I have an old masco amp I have been working on and I have a large amplified signal right up to the output transformer.
The output transformer has gnd and 3 taps for 4, 8 and 16ohm.
Do you get the same result on each tap? Is the black grounded OK?
Although if you've ordered the new part anyway I suppose it doesn't matter.
no I do not get the same result on each tap. I am not sure what I should be seeing but I get .5, 1, + 1.5 ohms when I test.
The ground is solid as far as I can tell
+1. I built this little amp a while back.
Transistor amp, sure, but similar layout.
View attachment 89238
Initially I had the transformer primaries the wrong way around and all hell broke loose, so I'd look at that first.
Hah! I guess you are too young to know this Steen' but the earlier valve amplifiers used interstage transformers as well.
The one in the (Deacey?) amp shown is doing duty as a phase inverter but in valve amps they also gave a decent voltage gain and were used because valve performance was poor and valves very expensive (not to mention the amount of support power, HT, heater and grid bias)
Note to OP. The 5V4G rectifier can be replaced with the far more rugged GZ34 if needs be.
Dave.
okay thats done. Seems like I am closer to my goal
Yup. I'd do that first.Will have to take all voltage measurements again.
Perhaps focus on this once you've tested all the voltages.One strange thing I have found is I have replaced the gain pot 4 different times now and none of them seem to work properly.