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Ampeg Heater Circuit Questions

4/19/2000 5:25 PM
ADM	Ampeg Heater Circuit Questions I've noticed that some Ampeg's have a different way of referencing the heater voltage than the standard center-tap to ground or the use of 2 100 ohm resistors. 1. The center tap of the heater transformer is referenced to the power tube cathodes in a cathode biased amp. 2. A non-center tapped heater transformer is connected via a 100 ohm balance pot (hum control) to the bias supply in a fixed bias amp. Are there any benefits to this type of connection? Andrew.

4/19/2000 5:25 PM

ADM

Ampeg Heater Circuit Questions

I've noticed that some Ampeg's have a different way of referencing the heater voltage than the standard center-tap to ground or the use of 2 100 ohm resistors.

1. The center tap of the heater transformer is referenced to the power tube cathodes in a cathode biased amp.

2. A non-center tapped heater transformer is connected via a 100 ohm balance pot (hum control) to the bias supply in a fixed bias amp.

Are there any benefits to this type of connection?

Andrew.

Replies:

Ray Ivers Andrew,Supposedly, ... -- 4/20/2000 12:36 AM
andyfuchs I remembered an old Scott audio tri... -- 4/22/2000 2:34 PM