It's much simpler to clip one end of a jump lead to the chassis and the other to one lead of the resistor. Since the clip holding the resistor is grounded, you can hold the resistor by the clip while touching the other lead of the resistor to the capacitor terminal.
If the jumper lead to the chassis slips off which can easily happen, you risk exposure to high, dangerous voltage. His technique demonstrates a way to avoid taking unnecessary risk and is much safer.
If you have one hand in your pocket (as you should when doing this) it will not complete a circuit and you do not have to worry about it slipping off. :)
Question please ... I have listened to over 50 videos that explain how to drain filter caps, but none of them mention if the amp is plugged in while draining the caps. I would assume it is, if you are grounding to chassis, to complete the ground the chassis would have to be connected to ground right ? And the only way I know to do this is by plugging in amp ? Please can anyone clarify this for me. Thank you
Terry, it’s a fair question which indicates that you should consider purchasing 1 or all of our Tube Amps 101 videos to help you thru the learning curve in vintage tube amp repair? You can do that here: www.recycledsound.net. As for your question: NO!! Any amp must be UNPLUGGED and capacitors drained BEFORE you ever think about putting your hands or tools inside the chassis. The chassis IS the ground reference for the circuit.
What about standby switches when grounding to the chassis? So when the standby switch is 'on' its actually an open circuit? Ie opposite of a light switch. As I understand it the switch prevents the high voltage (from caps) from hitting a cold tube and creating an arc (hurting the cap and/or tube). So if you want to drain the caps grounding to the chassis, leaving standby ON creates a CLOSED circuit which allows the caps to drain. So why not just go from the positive to negative on each cap? This would avoid any risk of an open circuit (for any reason) that would prevent actually draining the cap--a dangerous potential outcome!
@@recycledsound But did you mentioned this in this video ?. That the power needs to be pressed on but with the power cable unplugged ?. This is a crucial info right ?.
Either way is sufficient and safe in my opinion for applications such as this plus I’m glad that this question was posted. If my memory is correct (while unfortunately my wires got crossed leaving amnesia since) that if am repair technician has many size capacitors that are capable of higher voltage capacity for discharge. Would using a 470ohm be a terrible idea when discharging a 500ohm+ capacitor? If it’s okay to do so isn’t it that to completely discharge said higher voltage that it’s possible to do so by cycling the power switch to the off/on until depleted? I thank you for your upload and patience with off the wall questions but people seem to like to assume instead of ask quite a bit. Plus if it’s another option great but if it’s a bad idea then it’s been addressed for reference instead of assume that a question hurts more than °⚡️roulette⚡️° Again thank you and great work keeping our warm vibes alive!
I have all of your videos and I like them . Question where do I get high quality alligator clips to make this draining tool
Home Depot, Autozone, eBay….
Thanks for this clear video
Do you have any new videos coming out soon
Thanks for the info sir
It's much simpler to clip one end of a jump lead to the chassis and the other to one lead of the resistor. Since the clip holding the resistor is grounded, you can hold the resistor by the clip while touching the other lead of the resistor to the capacitor terminal.
If the jumper lead to the chassis slips off which can easily happen, you risk exposure to high, dangerous voltage. His technique demonstrates a way to avoid taking unnecessary risk and is much safer.
OK. Point taken.
If you have one hand in your pocket (as you should when doing this) it will not complete a circuit and you do not have to worry about it slipping off. :)
Question please ...
I have listened to over 50 videos that explain how to drain filter caps, but none of them mention if the amp is plugged in while draining the caps. I would assume it is, if you are grounding to chassis, to complete the ground the chassis would have to be connected to ground right ? And the only way I know to do this is by plugging in amp ?
Please can anyone clarify this for me.
Thank you
Terry, it’s a fair question which indicates that you should consider purchasing 1 or all of our Tube Amps 101 videos to help you thru the learning curve in vintage tube amp repair?
You can do that here: www.recycledsound.net.
As for your question: NO!!
Any amp must be UNPLUGGED and capacitors drained BEFORE you ever think about putting your hands or tools inside the chassis. The chassis IS the ground reference for the circuit.
inlandbott oh SHIxxxx .... you’re correct..... the way he asked it should be NO!!
Will the amp still need to be plug but turned off and standby switch on if it has it??
ALWAYS unplug an amp AND drain the caps prior to any work inside the chassis!
Yes…. Leave power and standby switches ON.
@@recycledsound thank you sir… i have an ampeg that nots breaking up… i would like at least to check it out.. Ampeg J12T
What do you mean by saying four seventy ohm resistor ? . Means 4,7 Ohm or 470 Ohm or 4,70 Ohm ??
470 ohm
@@recycledsound I thought you meant 470K…. But you are saying only 470 ohm?
What about standby switches when grounding to the chassis?
So when the standby switch is 'on' its actually an open circuit? Ie opposite of a light switch. As I understand it the switch prevents the high voltage (from caps) from hitting a cold tube and creating an arc (hurting the cap and/or tube). So if you want to drain the caps grounding to the chassis, leaving standby ON creates a CLOSED circuit which allows the caps to drain.
So why not just go from the positive to negative on each cap? This would avoid any risk of an open circuit (for any reason) that would prevent actually draining the cap--a dangerous potential outcome!
this draining needs to be made with the power pressed on but unplugged ?
Yes!
@@recycledsound But did you mentioned this in this video ?. That the power needs to be pressed on but with the power cable unplugged ?. This is a crucial info right ?.
Phillip Trebor Udar it’s not exactly crucial if you have connected a jumper to ground from pin 1 of a preamp tube!
Either way is sufficient and safe in my opinion for applications such as this plus I’m glad that this question was posted.
If my memory is correct (while unfortunately my wires got crossed leaving amnesia since) that if am repair technician has many size capacitors that are capable of higher voltage capacity for discharge. Would using a 470ohm be a terrible idea when discharging a 500ohm+ capacitor? If it’s okay to do so isn’t it that to completely discharge said higher voltage that it’s possible to do so by cycling the power switch to the off/on until depleted?
I thank you for your upload and patience with off the wall questions but people seem to like to assume instead of ask quite a bit. Plus if it’s another option great but if it’s a bad idea then it’s been addressed for reference instead of assume that a question hurts more than °⚡️roulette⚡️°
Again thank you and great work keeping our warm vibes alive!
What do you mean by saying four seventy ohm resistor ? . Means 4,7 Ohm or 470 Ohm or 4,70 Ohm ??
@Mendozer01 so is better t0 go with 10000 Ohm ?