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Old 11th June 2007, 05:33 PM   #1
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Default Anode stoppers

Hi all,
I have recently started reviewing a number of my projects and adding 100ohm or 10ohm anode stoppers. This has been particularly effective with my RH807 amp, my Thorstens phono preamp and with a 5687 preamp. In all cases it has taken a slight edge off the top end and in the case of the 5687 preamp it helped remove a hum issue.
All these instances have involved flying leads to the load resistor or to a CCS.
What do other people feel about the need for anode stoppers ?
Everyone talks about Grid stoppers, but few people seem to use anode stoppers.

Shoog
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Old 11th June 2007, 06:06 PM   #2
Zen Mod is offline Zen Mod  Serbia
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Default Re: Anode stoppers

Quote:
Originally posted by Shoog
Hi all,
I have recently started reviewing a number of my projects and adding 100ohm or 10ohm anode stoppers. This has been particularly effective with my RH807 amp, my Thorstens phono preamp and with a 5687 preamp. In all cases it has taken a slight edge off the top end and in the case of the 5687 preamp it helped remove a hum issue.
All these instances have involved flying leads to the load resistor or to a CCS.
What do other people feel about the need for anode stoppers ?
Everyone talks about Grid stoppers, but few people seem to use anode stoppers.

Shoog

ferrite beads are helpful on all toob pins
in some cases they aren't enough ,so you must use resistors instead
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Old 11th June 2007, 06:17 PM   #3
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There are many options to try when the amp is unstable. Anode stoppers sometimes help. All depends on the path of parasitics.
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Old 12th June 2007, 06:01 PM   #4
pchw is offline pchw  United States
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Sorry for a stupid question, what is anode stopper? How is used?

Thanks!!
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Old 12th June 2007, 06:14 PM   #5
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Quote:
Sorry for a stupid question, what is anode stopper? How is used?
When the load on the anode isn't right up on the valve base(ie in the case of a CCS or a heatsinked load resistor) - you add a small resistor onto that base at the pin.
This helps prevent the valve from going into radio frequency oscillation, which inevitably leads to intermodulation distortion and other unpredictable results.

Shoog
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