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Old 20th November 2015, 05:46 PM   #1
skidave is offline skidave  United States
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Default Simple SE Changing Feedback Switch While On

Wrapping up a Simple SE build.

Any issues with turning the feedback switch on / off while the unit is powered on? I read some posts here, but have not found a sentence that states 'I turned the feedback switch on/off while the unit was on playing music'. I'm assuming it is ok while powered on playing music.

I have other tube amps with a Triode / UL switch which I switch while on, but at low volume levels. No issues there.

I am building it with different cathode resistors connected in parallel via a switch. I'm not using a special make before brake switch, so I'm going on the assumption (again) that if I switch the switch quickly, there should be no issues. Thoughts?


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Old 20th November 2015, 07:31 PM   #2
sreten is offline sreten  United Kingdom
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Just switch a parallel resistor to the higher value, for the lower value.

rgds, sreten.
There is nothing more practical than a really good theory - Ludwig Boltzmann
When your only tool is a hammer, every problem looks like a nail - Abraham Maslow

Last edited by sreten; 20th November 2015 at 07:35 PM.
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Old 20th November 2015, 11:12 PM   #3
rknize is offline rknize  United States
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It will be fine. The caps will hold the DC offset while the resistors are being swapped out.

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Old 21st November 2015, 06:29 PM   #4
skidave is offline skidave  United States
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Thanks. I'm using a 680 Ohm cathode resistor with others in parallel selected by a dual pole rotary switch.

I appreciate the feedback.
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