Re: Marshall Jubilee 2554 vs JTM30
My friend has an older JTM60(I have no clue what year, a 70's maybe),
Are you sure about this? I didn't think the JTM range went back that far. I thought production only ran from about '94 - '97.
What reasons are those amps said to be less reliable?
It's very much an over-heating issue. Basically, as a means of cutting costs Marshall solder the valves/tubes directly to the PCB board. This makes production much cheaper as it's much easier to manufacture, but we know how hot vavles get. They simply give off so much heat that the components on the PCB board, and the board itself in a lot of cases, give(s) up!
This isn't a problem on most valve amps because;
*The valves are mounted physically further away from all the delicate stuff.
*The components used are much higher quality and hence, much more resilient.
*Ventilation is much more ergonomic.
Marshall really made a good sounding amp for price they attached to the JTM range. The problem is that to justify that price, shortcuts had to be made. This is where Marshall really screwed up with the JTM stuff. I don't know if they could have made a *better* amp and retained the price, but they certainly could have made a more reliable amp. This just didn't seem to be a factor during the design stages. If it was then I think the JTM could have been another classic.