Hello, my radio has a hi lo switch on the power supply. It motorboats when you set the switch to hi. The closest schematic is us radio model 80. i replaced the two caps that looked like small rectangular match boxes(they said polymet on them) .05uf

:Hello, I was wondering if it could be in the tubes or power supply or maybe a trimmer cap adjustment. I did notice that the trimmer cap near the antennna has been unscrewed all the way. Gary at ptop said that the power supply had paper caps in it? Paper caps dont go bad like electrolytics?
:
:Hello, my radio has a hi lo switch on the power supply. It motorboats when you set the switch to hi. The closest schematic is us radio model 80. i replaced the two caps that looked like small rectangular match boxes(they said polymet on them) .05uf

Hi Sean

Usually caps is the reason for motorboating but it could also be lack of tube shields? If you do any rewiring in a radio be sure replacement follows the same path. Routing wires can also cause the problem

Norm

::Hello, I was wondering if it could be in the tubes or power supply or maybe a trimmer cap adjustment. I did notice that the trimmer cap near the antennna has been unscrewed all the way. Gary at ptop said that the power supply had paper caps in it? Paper caps dont go bad like electrolytics?
::
::Hello, my radio has a hi lo switch on the power supply. It motorboats when you set the switch to hi. The closest schematic is us radio model 80. i replaced the two caps that looked like small rectangular match boxes(they said polymet on them) .05uf

:Hello, I did replace the two audio interstage transformers so could this cause this? The radio used no tube shields or didnt have them when I got it...should it?....26 26 26 26 24 26 71a 71a
:
:Hi Sean
:
: Usually caps is the reason for motorboating but it could also be lack of tube shields? If you do any rewiring in a radio be sure replacement follows the same path. Routing wires can also cause the problem
:
:Norm
:
:
:::Hello, I was wondering if it could be in the tubes or power supply or maybe a trimmer cap adjustment. I did notice that the trimmer cap near the antennna has been unscrewed all the way. Gary at ptop said that the power supply had paper caps in it? Paper caps dont go bad like electrolytics?
:::
:::Hello, my radio has a hi lo switch on the power supply. It motorboats when you set the switch to hi. The closest schematic is us radio model 80. i replaced the two caps that looked like small rectangular match boxes(they said polymet on them) .05uf

The only tube that might need a shield would be 24.

Try reversing a set of wires on an audio interstage transformer. Not very often but I've seen radios go into oscillation from audio interstage transformers.

Norm

::Hello, I did replace the two audio interstage transformers so could this cause this? The radio used no tube shields or didnt have them when I got it...should it?....26 26 26 26 24 26 71a 71a
::
::Hi Sean
::
:: Usually caps is the reason for motorboating but it could also be lack of tube shields? If you do any rewiring in a radio be sure replacement follows the same path. Routing wires can also cause the problem
::
::Norm
::
::
::::Hello, I was wondering if it could be in the tubes or power supply or maybe a trimmer cap adjustment. I did notice that the trimmer cap near the antennna has been unscrewed all the way. Gary at ptop said that the power supply had paper caps in it? Paper caps dont go bad like electrolytics?
::::
::::Hello, my radio has a hi lo switch on the power supply. It motorboats when you set the switch to hi. The closest schematic is us radio model 80. i replaced the two caps that looked like small rectangular match boxes(they said polymet on them) .05uf