Hi Alun,
I think IG40 comment to check "mycollins.net" site is a great idea, very interesting and has correct proceedures.
Bias the power tubes in the VT-100 is straitforward, adjusting the input/driver tubes is a little more interesting and will require some basic electronic's backround. I would not try this proceedure without two volt meters.
It is my understanding, ARC recommends adjusting the driver/input tubes at the same time you make a power tube change with the VT-100 original and Mark 2 units.
If you were to purchase a second hand VT-100 amp, several ARC dealers and other service centers can correctly complete this tube replacement/bias service without sending the unit back to ARC. Maintenance should not be to difficult but may require a local Tech for assistance.
Good Luck,
Steve
I think IG40 comment to check "mycollins.net" site is a great idea, very interesting and has correct proceedures.
Bias the power tubes in the VT-100 is straitforward, adjusting the input/driver tubes is a little more interesting and will require some basic electronic's backround. I would not try this proceedure without two volt meters.
It is my understanding, ARC recommends adjusting the driver/input tubes at the same time you make a power tube change with the VT-100 original and Mark 2 units.
If you were to purchase a second hand VT-100 amp, several ARC dealers and other service centers can correctly complete this tube replacement/bias service without sending the unit back to ARC. Maintenance should not be to difficult but may require a local Tech for assistance.
Good Luck,
Steve