hello all, I am building the tube amp circuit in the tutorials section of this site, it is located here:
I have everything assembled, but I have not yet been successful due to some problems with the output transformer ( the auto ignition coil ) I get 0 volts output from the coil, get 160 VDC into the coil from the power supply.
I looked up how to test an automotive coil, and found that mine had acceptable resistance between plug wire connector and the 12V connections, but that between the 12V connections only, I had 0 resistance, which told me this coil is BAD.
I promptly ran down to my autoparts store and got a brand new coil for $35 and hooked it up, preparing to be amazed at my tube amp....only to find it has the exact same ailment as the first coil. ( No resistance between "+" and "-" contacts )
What are the chances I would have two bad coils like that? Could I have ruined both coils un-intentionally? The box says it handles up to 4800V, I hit it with 160V, and 12 V. Can anyone shed some light here?
thanks
Dave