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Old 22nd October 2006, 12:17 AM   #1
jayme is offline jayme  United States
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Default aikido thump

Anyone else get a loud thump when turning off their aikido-based preamp?

Just wondering if the issue is with my PSU section...
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Old 22nd October 2006, 01:50 AM   #2
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It is reportedly common practice, among those who use separately powered preamps, to switch off the main amp first, wait a second or two, and then switch off the preamp.
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Old 22nd October 2006, 02:02 AM   #3
jayme is offline jayme  United States
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Yeah...I am familiar with that practice...but I'd like to look for an overall solution other than a guideline (my wife likes to shut everything off at once...)
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Old 22nd October 2006, 03:11 AM   #4
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I put an idiot sheet next to the equipment. It spells out the turn on and off procedure.

Problem solved
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Old 22nd October 2006, 07:27 AM   #5
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I use a relay that shorts out the output (after the cap) with its NC contacts.
I energize the relay after a delay at turn on and de-energize it immediately at turn off.

No thumps.

Cheers

Andrea
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Old 22nd October 2006, 08:37 AM   #6
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Default Re: aikido thump

Quote:
Originally posted by jayme
Anyone else get a loud thump when turning off their aikido-based preamp?

Just wondering if the issue is with my PSU section...
jayme
In my Aikido I have a 1.200 micro farad capacitor at a 215 V. It takes some time to load and similarly - to unload.
The result is: no thumps on turning on, and no thumps on turning off. It just fades (the tubes are cold befor the power line really drops).

I switch my power amp with the power switch of the Aikido. My power aplifier is transistor (LeMonstre) and would really show up any odd issues. Maximum at turn on is 3 volts for 1 second at turn on (after 30 sec) and none at turn off. For safety, you should really add Andy's relay.


success
albert
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Old 22nd October 2006, 03:13 PM   #7
jayme is offline jayme  United States
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How would I implement a relay? Just have a switch which shunts B+ thru a resistor to ground?

I don't need the protection at start-up...I use a 5AR4 rectifier, which gives me a slow ramp up.

My PSU doesn't have a lot of big caps: it is CLCLC with 3.3uF, 20uF, and 40uF caps, respectively. I use some big 15H chokes for the inductors.
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Old 23rd October 2006, 03:32 PM   #8
Klimon is offline Klimon  Belgium
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Quote:
I put an idiot sheet next to the equipment. It spells out the turn on and off procedure. Problem solved.
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Old 24th October 2006, 12:29 PM   #9
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Quote:
Originally posted by jayme
How would I implement a relay? Just have a switch which shunts B+ thru a resistor to ground?

I don't need the protection at start-up...I use a 5AR4 rectifier, which gives me a slow ramp up.

My PSU doesn't have a lot of big caps: it is CLCLC with 3.3uF, 20uF, and 40uF caps, respectively. I use some big 15H chokes for the inductors.

I was talking about shunting the output (=signal) after the coupling cap.

Cheers

Andrea
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Old 26th October 2006, 01:30 PM   #10
Bill*B is offline Bill*B  United States
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My own Aikido has a subsonic output at turnoff - you can see the speaker cones thrust out, although there's no sound. I've never tried to track down the source, although I (like you) suspect that it is the power supply - I used a regulated unit and I'll bet the voltage surges when the voltage reference falls out of conduction.
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