Hiwatt Dr103 copy mains hum and how to reduce it?

[ThreeChordWonder]

Mojototone DR103 100 watt head.

It's produces quite a noticeable mains hum, especially if the input volumes and master volume are set to max. Obviously this wouldn't be heard (much) when playing, but even at lower volumes its noticeable. The Amp sits in a metal chassis, and I added a grounded aluminum cover to the otherwise open bottom.

Some quick measurements using a retail grade mid-price digital dB meter placed next to the cab:

Ambient / amp off 42.0 dB
Input volumes and master volume at zero 50.2 dB
Input volumes at 12 o'clock and master volume at zero, 59.2 dB
Input volumes and master volume at 12 o'clock 55.4 dB and there's a 120 Hz additional buzz and some "ticking" noise added
All three volumes at max 77.0 dB
Input volumes at zero, master volume at max 50.8 dB

I think, therefore, I've got I t two or three issues going on here: preamp 60 Hz hum, power amp 60 Hz hum, and preamp 120 Hz hum, which seems to be coming from the Brilliant channel.

Ideas / suggestions welcomed.

Thanks in advance.

[GAStan]

Does it have the hum with nothing plugged in to the input?

Pictures would let us look over the amp.

[ThreeChordWonder]

I reflowed all, and I mean all, the solder joints and the hums and ticking have gone. It must have been a bad joint or a bad ground (or a bad joint to a ground causing them..

There's still some hiss (white noise) with the volumes cranked right up, but I guess that's to be expected from a fairly simple, 50-60 year old circuit design.

[GAStan]

Glad you got it sorted out.

All of my amps have some hiss when cranked up, I think it's normal. Some tubes have more hiss/noise than others, especially in V1 position.