Don’t throw away your bad vacuum tubes! Make some bias probes instead. This probe is a step up from the ones I’ve made previously because it has a tap for the cathode. This facilitates plate voltage measurements for cathode biased tubes without opening the amp. You can also get screen current measurements and cathode resistor voltage drop measurements without opening the amp using Ohm’s Law calculations.
*SHOW YOUR SUPPORT*
1: Donate via Paypal: https://paypal.me/guitologist?locale.x=en_US
2: Buy Merch: http://bit.ly/GuitologistMerch
3: Send in Viewer Mail. (Contact Me for details at [email protected] )
4: Purchase an ad! (Rate sheets available upon request at email above.)
5: Buy something from a sponsor and tell them I sent you.
6: Stand in the middle of the street naked screaming "LONG LIVE THE GUITOLOGIST!" Then when the cops arrive, tell them about my channel.