08-15-2016, 10:43 PM
What sort of dc voltage are you getting to the set? I'm try to figure if your transformer is large enough. We two possibilities for buzz. Does it sound like 60cy hum or is it a raspy sound a buzzer or a old skool electric shaver?
If it sounds like 60cy hum then we need to look at the filter in the outboard 32vdc supply. If it is a raspy sounding it's the coming from the vibrator. If the dc input voltage is low this may cause the motorboating issue. Also a good gnd and a long ant may help. With out it may be prone to pickup is own arcing from the vibrator contacts.
100mf is dinky go with 10K
If it sounds like 60cy hum then we need to look at the filter in the outboard 32vdc supply. If it is a raspy sounding it's the coming from the vibrator. If the dc input voltage is low this may cause the motorboating issue. Also a good gnd and a long ant may help. With out it may be prone to pickup is own arcing from the vibrator contacts.
100mf is dinky go with 10K
When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got!
Terry
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
