The most expensive equipment that you have

[T4P]

Tubes or valves depending on area 

i call them 'glass baloons with pieces of scrap metal in it' or 'relics of a dinosaur age'

But they sound so good!

Meh, bullshit
it's the same as saying a man from the dinosaur age does things better then dave jones

[free_electron]

But they sound so good!

That is subjective ...

An ideal amplifier does only increase amplitude and does not create distortion or byproducts. valves are notorious for creating harmonics ... ( that's what makes them sound 'good' )

Anyway, history has decided. Apart from a group of people who cling to them (just like there are vintage car collectors ) the vacuum tube has all but disappeared , except for some specialty applications. Mainstream production has ceased long ago. yeah yeah there is some bozos out there still making them, i'm talking mainstream. They disappeared early 70's, and that's 40 years ago. Good riddance !

[TriodeTiger]

Albeit a lot of people with old equipment can say it, my Tektronix 2215 in today's dollars is >$3000 (94% off)

No digital noise, and samples per second is some reallly large number

Who needs single shot capture, when 1/sec per div can focus the beam sweeps to a point where it burns the waveform in your eye anyway? Overshoot capturing here I come!

*ahem*

Then Hakko FX-888: $~90
Then Extech EX210 DMM (mini, +IR thermometer): $~70

[JuKu]

Full license to Altium.
dScope III audio analyzer
Agilent mixed signal scope

Bought cheap when the company that owned them closed down the side office.

[bingo600]

1: Agilent 34401A DMM 
2: Digiview DV-100 Logic Analyzer
3: Rigol DS1102E
4: 2 x Agilent 6632B PSU
5: Rigol DG1022
3: Rigol DS1052E
5: Racal Dana 1991 Counter
6: Quick 202D 90w indiction soldering iron (great tool)


/Bingo