Servicing amplifiers from very small companies?


A lot of us buy amps/preamps from what are virtually one-person operations. In general, can these be serviced if the company shuts down? How easy is it for a skilled service shop to deal with a unit with which they are not familiar, even assuming all the parts are available (and is even this a good assumption?).

(I don't even want to ask about speakers or CD players/transports, as I don't think the prospects are good in those areas, but I was hoping prospects were brighter with electronics with no moving parts.)

I know this question has come up with Shindo in relation to parts, but I thought I would expand it.
rgs92
Most all components can be repaired by a good tech unless a part is no longer available like a CD laser. My friend fixes components for local audio shops here in New Jersey without any real issues.
Tube products generally easier for a good tech w/o a schematic. A big problem is if parts are "potted" or otherwise have the identifying characteristics obscured. Happened to me once w a Llano boat anchor, I mean power amp. Of course, 10 years later, now someone has gotten the schematics...
Thanks Swampwalker. I originally wanted to title the thread "What to do with paperweights?" but I like 'Boat Anchor' better.