Marshall 1959 '69 replica low voltage on preamp tubes problem
Posted: Sun May 27, 2018 3:45 pm
Hi,
I've build a Marshall 1959 folowing the instructions of the metroamp site.
I live in europe (sorry for my english) so I've to modify a little a tad kit bought in germany following the instructions of metroamp.
Problem is that I have a very lower voltage on pin 1 and pin 6 from v3 and no voltages on v2 and v1.
The left section of the turret and power tubes voltages are ok, in line with the chart reported on the final part of the manual. Problems start after 10k/1watt resistors because almost the right part of the board is dead in voltage.
Tad kit give just carbon comp resistors, don't know if this could be the problem. On original instruction the first upper resistor on left is of 8.2k insted of 10k tad give me.
I attached a picture of my build with respectives voltages on pins of the board and capacitors. I can't understand where the problem could be.
Please, any help is appreciated.
Thanks!
I've build a Marshall 1959 folowing the instructions of the metroamp site.
I live in europe (sorry for my english) so I've to modify a little a tad kit bought in germany following the instructions of metroamp.
Problem is that I have a very lower voltage on pin 1 and pin 6 from v3 and no voltages on v2 and v1.
The left section of the turret and power tubes voltages are ok, in line with the chart reported on the final part of the manual. Problems start after 10k/1watt resistors because almost the right part of the board is dead in voltage.
Tad kit give just carbon comp resistors, don't know if this could be the problem. On original instruction the first upper resistor on left is of 8.2k insted of 10k tad give me.
I attached a picture of my build with respectives voltages on pins of the board and capacitors. I can't understand where the problem could be.
Please, any help is appreciated.
Thanks!