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Old 24th March 2012, 09:53 PM   #1
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Default Time relay

Hello buy a relay time for my stage 300B and put it after the high tesion 30 seconds jumps and shakes the speaker cones.
Anyone know the exact placement for not doing this?
the device is this (Power Supply Board Action Delay 300B 2A3 KT88 tube amp) (Sophia Electric)
thanks
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Old 25th March 2012, 01:07 AM   #2
dgta is offline dgta  United States
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Post the schematic of the amp and power supply with the relay. Someone will be able to help you.
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Old 25th March 2012, 12:28 PM   #3
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Your english needs work and its hard to understand you but I will take a guess. You bought a (Power Supply Board Action Delay 300B 2A3 KT88 tube amp) (Sophia Electric) and now the thing bangs on and your speakers shake?
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Old 25th March 2012, 09:44 PM   #4
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Default time delay

right, when entering the high voltage moves the cones of the speakers
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Old 26th March 2012, 12:29 AM   #5
popilin is offline popilin  Argentina
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Try the relay switch-on after warm up of tubes.
You need first power the filaments, say 30 seconds.
Use a cheap speaker to test, just in case.
Or even better, short circuit the output of the amp with another relay during start up.
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Old 26th March 2012, 06:55 AM   #6
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Connect 4-5H choke in B+ in order to build CLC filter..
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Old 27th March 2012, 11:13 PM   #7
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Default time delay

you could make me a schema
thanks
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Old 28th March 2012, 01:30 AM   #8
VaNarn is offline VaNarn  Australia
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It appears that you need to fit suppressor networks across the relay switch contacts.This is usually a 0.1mFd capacitor in series with a 100 Ohm resistor.The capacitor should be rated to suit the B+ voltage with a healthy safety margin if there are filter chokes in the supply rail.
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Old 28th March 2012, 01:30 AM   #9
popilin is offline popilin  Argentina
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Quote:
Originally Posted by miguelnoda View Post
you could make me a schema
thanks
Try this.
Relay contacts are conected to speakers output, short circuit in "power off", after time delay, relay is "power on" and short circuit is removed.
Need a three contacts relay.
Time delay is about 10sec. If so much, decrease R, say 470K
NEVER power up a valve amp without a load.
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Old 15th September 2012, 10:58 PM   #10
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Default time delay

I send the schematic to see where I put the time delay or diodes
http://Click the image to open in full size.[/IMG]
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