what is the sentry mod? does it remove the protection circuit ? what are the benefits ?
softmachine72 wrote:Thanks for a simple answer. BTW, I did dn. load the service manual. Are the 150mf and 30mf electrolytic caps original? I will be glad to answer any questions that are more in my wheel house.You're welcome!
The McIntosh Sentry Monitorhttp://www.roger-russell.com/mcintosh1. ... trymonitor
Although the autoformer provided an efficient match between the power transistor output and a variety of load impedances, a short circuit at the amplifier output or a load that was much lower than the selected autoformer tap could cause excessive current to flow in the output transistors. To complement the new transistor amplifiers, the McIntosh Sentry Monitor circuit was developed which prevented destructive current levels from occurring under any conditions. This circuit sensed the dynamic operating time, voltage and current of each amplifier output stage and controlled the current flow, confining it to non-destructive limits. The arrangement assured complete circuit reliability for all load conditions. The Sentry Monitor did not limit the rated power output available from the amplifier in any way. McIntosh power amplifiers continue to use the Sentry Monitor circuitry.
Searing75 wrote:Hippie guy. I can't see the other resistor on the upper part of the board that you lifted a leg of? I see the middle resistor in the grouping of three, but where is the other?Try making sure you are viewing 100% and not 1250% or more. If that doesn't work, it is R27 in the service manual.