Tube Amps / Music Electronics
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|7/28/2004 9:06 PM|
I want to put a bleeding resistor to my 5e3.
I've draw the resistor in this layout:
What about the location of the resistor? it's right?
I put a 100k 2w.
|7/29/2004 6:22 AM|
|Chris - CMW amps
Couldn't open the file.....
Why do you want/need a bleeding-resistor?
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|7/29/2004 8:38 AM|
I need this resistor for extra security.
The file is placed in Geocities, so copy the URL, and paste in a new explorer and the image will be opened.
|7/29/2004 9:07 AM|
|Chris - CMW amps
Ok, copy & paste did work.
Use a 220k/2W resistor , it will certainly bleed some voltage but always be carefull.
Hope this helps,
|7/29/2004 11:47 AM|
If by extra security you mean discharging the filters when you turn the amp off it may be overkill.
When the switch is thrown the tubes in a cathode biased amp continue to draw current as they rapidly cool down, draining the PS.
|7/29/2004 2:06 PM|
|Bruce /Mission Amps
Right, except this condition:
The preamp and power tubes are cold.
But a 5Y3GT can start conducting B+ within 7-10 seconds, fully charging the filter caps.
Shut the amp off or pull the power cord.
Unfortunalty, there is no hot tubes to drain the supply back off.
Rare but I've poked myself a few times doing it!
As Chris mentioned, just solder a 220K-2w metal-oxide resistor across the first filter cap to ground.
|7/29/2004 3:13 PM|
Makes sense, Bruce! Not a likely scenario but Murphy's Law says that it WILL happen - and it'll hurt!
A bleeder is indeed cheap insurance.
I should worry more...
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