exploding transistors

Posted by: Jon Moxon on 31 August 2000

Bit of a vague question this one, but hope you all understand.

We're all aware of the potential dangers of using cables other than NACA5 with Naim amps.

Let's assume for the sake of the argument that one of the small transistors blows up in a Nait3, and a non-naim cable is one possible reason for this having happened.

What kind of cables would be most likely to cause this? Would the length of the cable play any part in this?

TIA

JonM

Posted on: 31 August 2000 by Rico

I think you'd find in this case that an output transistor would blow well before a signal transistor, assuming instability caused by incorrect loading. Your Informed comment, Paul S.?

Save yourself the worry, Run single-wired NACA5. It really is the dog's ******** (you know, those dangly bits), esp. the new stuff.

Rico - musichead

ricomuzik@hotmail.com

Posted on: 31 August 2000 by Andrew Randle

Also, Naim say that there is a minimum length of cable/channel to use to ensure stability.

Going from memory, I think that minimum length is 4m/channel.

Andrew

Andrew Randle
2B || !2B;
4 ^ = ?;

Posted on: 31 August 2000 by Andy S

But, don't you understand, transistors are MEANT to blow - they do that to protect the fuse that is elsewhere in the system.... (err - joke in case you didn't realise it!!)

Seriously, the output trannies are the ones to go if you use funny cabling (high capacitance). This is because the amps oscillate if they are presented with a high capacitance and low inductance load. The trannies then burn themselves out delivering lots of power at ultrasonic freqencies so the first thing you know about it is when the amp stops working.

Minimum NACA5 length is 3.5m.

Hope that helps.

Andy