-Jim
Some early radios will go into oscillation when turned up. Later radios neutralized the stages and were called Neutrodyne. Standard used straight TRF and didn't have this circuitry.
Does it look like any coils were rewound? Polarity of coils can make a difference with oscillation. I wouldn't make changes unless you can see one was rewound or replaced.
Adding a cap across the power supplies right at you radio may help.
Norn
:::Hi, got my radio working today with advice I got in this forum. It has one problem though, whenever I turn the clarity knob above 3/4 of its travel the radio starts to go into some kind of bad oscillation and the speaker emits a loud squeal. Also whenever I try to tune in a powerful station it has the same problem, it almost sounds like some kind of self oscillation or regeneration is going on, any advice? Thanks.
:::
::I'm a newb on these types of radios, but I know on mine the RF amp tubes are shielded with a metal shield, probably to prevent them feeding into each other. Are yours?
::
::-Jim
:Hi Kris
: Some early radios will go into oscillation when turned up. Later radios neutralized the stages and were called Neutrodyne. Standard used straight TRF and didn't have this circuitry.
:
: Does it look like any coils were rewound? Polarity of coils can make a difference with oscillation. I wouldn't make changes unless you can see one was rewound or replaced.
:
: Adding a cap across the power supplies right at you radio may help.
:
:Norn
:
::::Hi, got my radio working today with advice I got in this forum. It has one problem though, whenever I turn the clarity knob above 3/4 of its travel the radio starts to go into some kind of bad oscillation and the speaker emits a loud squeal. Also whenever I try to tune in a powerful station it has the same problem, it almost sounds like some kind of self oscillation or regeneration is going on, any advice? Thanks.
::::
:::I'm a newb on these types of radios, but I know on mine the RF amp tubes are shielded with a metal shield, probably to prevent them feeding into each other. Are yours?
:::
:::-Jim
A lot of companies made radios in the 1920's. I wonder if Stanrad is a copy of Standard?
Try a cap from each B+ lines to B-. Use a 10 mfd electrolytic and see if it makes a difference.
Norm
: Thanks for the advice, the radio looks untouched but that does not mean in the past it was messed with, so I will check it out. What size capacitor would you reccomend using, and on what part of the supply would you put it on? By the way I did recheck my spelling of the company's name an it is called stanrad.
:
:
::Hi Kris
:: Some early radios will go into oscillation when turned up. Later radios neutralized the stages and were called Neutrodyne. Standard used straight TRF and didn't have this circuitry.
::
:: Does it look like any coils were rewound? Polarity of coils can make a difference with oscillation. I wouldn't make changes unless you can see one was rewound or replaced.
::
:: Adding a cap across the power supplies right at you radio may help.
::
::Norn
::
:::::Hi, got my radio working today with advice I got in this forum. It has one problem though, whenever I turn the clarity knob above 3/4 of its travel the radio starts to go into some kind of bad oscillation and the speaker emits a loud squeal. Also whenever I try to tune in a powerful station it has the same problem, it almost sounds like some kind of self oscillation or regeneration is going on, any advice? Thanks.
:::::
::::I'm a newb on these types of radios, but I know on mine the RF amp tubes are shielded with a metal shield, probably to prevent them feeding into each other. Are yours?
::::
::::-Jim