1.never twist GDS (ECB) wires for any output
2.keep them shortest you can
3.include gate res ditto on gate pin
4.be sure that your parts are genuine ; if you doubt - testing routine out of circ is simple
5.if one channel is working - swapping parts ( take care to label them , to not mix if they're matched ) between channels isn't most insane idea in last 10 years
6.if your head is boiling - leave it for few days ; ride a bike , drink wine , communicate with children or even wife
2.keep them shortest you can
3.include gate res ditto on gate pin
4.be sure that your parts are genuine ; if you doubt - testing routine out of circ is simple
5.if one channel is working - swapping parts ( take care to label them , to not mix if they're matched ) between channels isn't most insane idea in last 10 years
6.if your head is boiling - leave it for few days ; ride a bike , drink wine , communicate with children or even wife
Attachments
As I prepare to start the testing on my plain vanilla A-J, I have a couple of questions.
1, Is there a best target temperature for the heatsinks? ...perhaps one at which the IRFP240s sound best? [I will be able to adjust heat sink airflow and will have a front panel temp readout]
2, To get up and running without alot of fuss, is it advisable to install any trimmers rather than all fixed resistors? If yes, where? [I measured all the resistors and they are all extremely close to spec, but this is my first class A project. I don't really know what to expect when I crank up the variac!]
TiA!
1, Is there a best target temperature for the heatsinks? ...perhaps one at which the IRFP240s sound best? [I will be able to adjust heat sink airflow and will have a front panel temp readout]
2, To get up and running without alot of fuss, is it advisable to install any trimmers rather than all fixed resistors? If yes, where? [I measured all the resistors and they are all extremely close to spec, but this is my first class A project. I don't really know what to expect when I crank up the variac!]
TiA!