Master List of "replace on sight" components?

[Dave_DC]

Hi All:

Has anyone ever compiled a master list of "replace on sight" components? To qualify, the part should not just be prone to failure, but rather deserving of replacement outright. These would be parts you'd replace on a unit even before its first dim-bulb power-up. One part I've seen mentioned are the "black flag" caps found some Sansui gear which can fail and cause oscillation and permanent damage to unobtainable output transistors. Another are those horrible exploding Rifa EMC caps found across the power line on Revox A77 AND B77 tape recorders (and some Tek scopes). I ask because I have a AU-919 and a MAC 1700 in need of restoration and I thought I'd ask the experts first to avoid the rookie mistake of not replacing any "high liability" components. Thanks in advance for any suggestions.

 

[Sam08861]

I'm a fairly new hobbyist, but find joy in refurbing equipment..

I replace all electrolytics most of the time for vintage gear more than 30 yrs old as a preventive measure.
Transistors with black legs or any of the known to fail transistors.
Selenium rectifiers
Same for any serviceable moving parts.. lubricants, belts, rollers, etc.
Any items with visible physical damage.. frayed wires, cracked components, burned/overheated parts
Maybe not replacing, but I've been reflowing solder joints more recently as well.

 

[Thorbr]

Add the infamous VD1212 "little ball of trouble" diode

 

[kwayde]

Hi All:

Has anyone ever compiled a master list of "replace on sight" components? To qualify, the part should not just be prone to failure, but rather deserving of replacement outright. These would be parts you'd replace on a unit even before its first dim-bulb power-up. One part I've seen mentioned are the "black flag" caps found some Sansui gear which can fail and cause oscillation and permanent damage to unobtainable output transistors. Another are those horrible exploding Rifa EMC caps found across the power line on Revox A77 AND B77 tape recorders (and some Tek scopes). I ask because I have a AU-919 and a MAC 1700 in need of restoration and I thought I'd ask the experts first to avoid the rookie mistake of not replacing any "high liability" components. Thanks in advance for any suggestions.

Here are xstrs:

https://audiokarma.org/forums/threa...ilure-prone-whatever-and-replacements.731653/

 

[Mr Boochie]

Bulging and/or leaking electrolytic caps.

 

[malden]

Add the infamous VD1212 "little ball of trouble" diode

I use to replace them religiously. I don't replace them anymore unless they are proven bad.. The VD1212 is a pretty reliable varistor often grouped in with the notoriously problematic MV12.

which is it?

 

[Nashou66]

Its the VD-1221 found in Sony V-Fet amps, also known as "Death Diodes"

Nashou

 

[titanstats]

RIFA capacitors, loud stink bombs after decades.