Hello Jim, Great video today. Just wanted to let you know I appreciate all of the segues down the rabbit hole! I'm learning a lot and found one of your radio repair books on amazon. Again, many thanks! Cheers - Luther
Hello greg, todays date is April 1st 2024, did you find those Russian germanium transistors yet?! and yes we know, we need to chain all the capacitors!
Greetings: Your "contact voltage" discussion had me thinking that adding some resistance in the socket-pin-to-cathode lead internally to the tube could become the source of a bias to the grid. Could have been an inventive selling point when tubes were still used.
Greetings: Measuring resistance requires using both probes of the meter. Early on at 16:00 you no longer have the meter's black probe connected anywhere.
A simple leakage test is made using an 1800 ohm 10 watt resistor in series between the chassis and a cold a water pipe using the AC voltage range on a Simpson 260. And first year electronics student from the 50’s 2:00 knows that. Use ohms law to calculate the current flow based on the 1800 ohm resistor and the AC voltage across it.
You've got more endurance and patience than I do. Also, why is Jim calling this a hot chassis set? It has a floating chassis. Not quite the same thing unless the isolation cap shorts out.
make the same voltage reading using a Simpson 260 VOM or monitor the cathode current. Contact potential is much like the forward bias in a transistor😊 whereas it needs more than .5 to .7 vdc to conduct. In a tube circuit .2 volts is nothing, it will not let yet allow cathode to plate electron flow conduction.
Hello Jim, Great video today. Just wanted to let you know I appreciate all of the segues down the rabbit hole! I'm learning a lot and found one of your radio repair books on amazon. Again, many thanks! Cheers - Luther
Hello greg, todays date is April 1st 2024, did you find those Russian germanium transistors yet?! and yes we know, we need to chain all the capacitors!
HE'S 🎨🖼 AT THE MOMENT OR IT COULD BE A BIG APRIL FOOL
Chain those puppies, Jim!
Greetings:
Your "contact voltage" discussion had me thinking that adding some resistance in the socket-pin-to-cathode lead internally to the tube could become the source of a bias to the grid. Could have been an inventive selling point when tubes were still used.
Greetings:
Measuring resistance requires using both probes of the meter. Early on at 16:00 you no longer have the meter's black probe connected anywhere.
when my sleeping pills don’t work I sometimes i put this show on to fall asleep at night
A simple leakage test is made using an 1800 ohm 10 watt resistor in series between the chassis and a cold a water pipe using the AC voltage range on a Simpson 260. And first year electronics student from the 50’s 2:00 knows that. Use ohms law to calculate the current flow based on the 1800 ohm resistor and the AC voltage across it.
hi Jim in the UK nearly every television was AC/DC so all could have a live chassis and of course that was 240 Volts
why do i have a glass bird in my shop? To ward off the bats in my belfry.
Jim I listened for an hour before throwing in the towel.
BTW. Why does Greg always have the same comments.
You've got more endurance and patience than I do. Also, why is Jim calling this a hot chassis set? It has a floating chassis. Not quite the same thing unless the isolation cap shorts out.
make the same voltage reading using a Simpson 260 VOM or monitor the cathode current. Contact potential is much like the forward bias in a transistor😊 whereas it needs more than .5 to .7 vdc to conduct. In a tube circuit .2 volts is nothing, it will not let yet allow cathode to plate electron flow conduction.
Fish paper is not what the fish monger wraps your salmon in.
it typically takes 250 milliamps at a voltage over 60 volys to kill you. So 200 micro amps is nothing.