McIntosh MA9000 temperature in standby

Hello,

My system consists of McIntosh MA9000 with DA2 DAC, McIntosh MT10, Burmester BA31 and IFI Zen Streamer.

I noticed that the temperature of the integrated amplifier (heatsink) is about 102°F (39°C) at a room temperature of 79°F (26°C).

I performed the following test by increasing the volume in 3 steps:

1. 30% volume for 15 minutes: heatsink temperature -106°F (41°C)

2. 50% volume for 15 minutes: heatsink temperature -117°F (47°C)

3. 70% volume for about 15 minutes: heatsink temperature -145°F (62.7°C) - the power was cut off

I would like to know if 55°F (13°C) on top of the room temperature is normal for McIntosh amplifiers in standby.

Thank you in advance for your support

constantin197003-15-2022 11:33am

imhififan Details Discussions Posts This discussion Message User 2,218 posts 03-19-2022 at 05:37am Copy Comment URL Report Comment Edit Delete "standby" and "idle" are two different things! In "standby", all the circuits in the integrated amplifier are shout-off except drawing small current to provide power to lite up the "standby" LED and maybe some control circuit. Therefore the heatsink should be at room temperature. At "idle", all the circuits (DAC, preamp section, power amp section, control circuits) in the integrated amp are on, only there's no source signals input. The class AB power amp section will run at its class A bias. Hence the heatsink temperature is higher than ambient temperature.