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Old 3rd March 2008, 11:12 AM   #1
alexg is offline alexg  Philippines
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Default diodes before plate load

I have seen some circuits of tube amp and preamps, mostly from Japanese sites that uses a diode in between the PSU and the plate load.

Can somebody please explain to this tube newbie the purpose of the diode in that part of the circuit?
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Old 3rd March 2008, 01:21 PM   #2
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There is absolutely NO reason to do this - unless there is a decoupling cap on the powersupply line that is after the diode - the diode then is acting as a "decoupler" so that ripple on the main supply from heavy load current demands doesn't affect the circuit being isolated.

Make sense?

Regards, Allen
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Old 3rd March 2008, 01:26 PM   #3
alexg is offline alexg  Philippines
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Thanks, that makes a lot of sense.
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