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Re: Zener Diodes in a 5F1 Champ to lower B+?

1/20/2005 7:10 AM
Dave H.	Re: Zener Diodes in a 5F1 Champ to lower B+? In my 18W amp I use 7 x 10V 5W zeners for a low power option. I mounted them on a tag board. They run at less than 1W each so they don’t get too hot. In a Champ you could use a resistor to drop 50V. Put it in series with the B+ from the first filter cap and add a second filter cap after the resistor to form a pi filter. This will reduce the B+ voltage and the hum which can be a problem in a single ended amp. The 5C1 Champ circuit is like that. A 1k/1k5 10/15W resistor should drop about 50V. Dave

1/20/2005 7:10 AM

Dave H.

Re: Zener Diodes in a 5F1 Champ to lower B+?

In my 18W amp I use 7 x 10V 5W zeners for a low power option. I mounted them on a tag board. They run at less than 1W each so they don’t get too hot. In a Champ you could use a resistor to drop 50V. Put it in series with the B+ from the first filter cap and add a second filter cap after the resistor to form a pi filter. This will reduce the B+ voltage and the hum which can be a problem in a single ended amp. The 5C1 Champ circuit is like that. A 1k/1k5 10/15W resistor should drop about 50V.

Dave