08-24-2014, 10:11 AM
Hiya Loose & Welcome to the Phorum!!
You may want to search the Phorum on the subject of the model 80. You will most likely find answers to a lot of your questions there in. From a practical standpoint you should measure the parts you are thinking of replacing just to be sure that they need to be replaced. Just because they are 80 some yrs old doesn't necessarily mean there defective or trouble makers.
These are the troublemakers: #2 open primary,#9,#11,#8 open feedback winding,#19,#20,. Check these resistors with an ohm meter and replace if they differ more than 10 percent of original value. As per normal replace all wax/paper condensers micas are usually are OK.
Wouldn't mess with the volume control or the bias resistor in the power supply unless they are known to be bad.
GL
Terry
http://www.nostalgiaair.org/PagesByModel...013843.pdf
You may want to search the Phorum on the subject of the model 80. You will most likely find answers to a lot of your questions there in. From a practical standpoint you should measure the parts you are thinking of replacing just to be sure that they need to be replaced. Just because they are 80 some yrs old doesn't necessarily mean there defective or trouble makers.
These are the troublemakers: #2 open primary,#9,#11,#8 open feedback winding,#19,#20,. Check these resistors with an ohm meter and replace if they differ more than 10 percent of original value. As per normal replace all wax/paper condensers micas are usually are OK.
Wouldn't mess with the volume control or the bias resistor in the power supply unless they are known to be bad.
GL
Terry
http://www.nostalgiaair.org/PagesByModel...013843.pdf
