burnedfingers wrote:
I would question as to why you would want to permanently modify the amplifier for triode only mode. If it were me I would install a quad pole double throw switch in the selentium (sp) rectifier position in the chassis and proceed to wire it up to go normal or triode mode.
Also do not flip the switch when the amplifier is powered on.
burnedfingers wrote:I will have to disagree on the bias answer. My experience is that when in triode mode the bias will increase from my setting of 50mA per tube to 55mA. This is on amplifiers that I have fitted with individual bias adjustment controls. Yes, do check the bias and be prepared to adjust.
Actually you can get about 18 watts in triode if you put in a UF4007 diode in series with the 100 ohm resistor.
mesherm wrote:Actually you can get about 18 watts in triode if you put in a UF4007 diode in series with the 100 ohm resistor. The cathode of the diode has to be pointing toward the screen. This keeps AC from flowing in the screen grid/plate circuit.
http://www.audioasylum.com/forums/DIYHiFi/messages/6928.html
mesherm wrote:Actually you can get about 18 watts in triode if you put in a UF4007 diode in series with the 100 ohm resistor. The cathode of the diode has to be pointing toward the screen. This keeps AC from flowing in the screen grid/plate circuit.
http://www.audioasylum.com/forums/DIYHiFi/messages/6928.html
sorenj07 wrote:mesherm wrote:Actually you can get about 18 watts in triode if you put in a UF4007 diode in series with the 100 ohm resistor. The cathode of the diode has to be pointing toward the screen. This keeps AC from flowing in the screen grid/plate circuit.
http://www.audioasylum.com/forums/DIYHiFi/messages/6928.html
You realize that guy quotes Dennis Fraker right? Just thought you should know. I've seen this called a myth, can't find the link right now, and it seemed credible. The main argument (IIRC) was that AC doesn't flow to the screens in the first place.
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