Marcus, Thanks for sharing! I will definitely watch for the ground issues then.
I have tried to keep moving and see what comes up.
So far, I have wired the switch for half/full power, pretty much everything that goes on the power tubes, and I still miss the 15K for the bias pot.Choke is not connected to the B+.
20180115 DumblePower section.jpg
I made a little schematic of the power supply of the amp. I did not want to change it at first, but voltages appear to be high so I might have to change the values of the resistors. I put the voltages and the value of each component butI am missing the value of the blue filter cap. Can't read it, but some pros here might help.
PowerSectionFinal.jpg
I will appreciate any comment as this is a first for me and I may have done some mistakes.
My build includes an active FX loop in the chassis. So I will have to add some B+ supply.
Here are a few questions :
1- In calculating the current drop across resistors after standby switch, I suppose I have to add all the resistor's value to determine the total resistance (R1+R2+R5+R6+R7+R8) and then use Ohm's law to get how much each resistor would have the current drop.
2- Why is there a 10W 510 ohms ciment resistor feeding B+2 as I did not see it on many schematics, and voltage is not dropping..
3- If I want to add power supply for my FX loop, I need to extend my B+ rail. Can i do so with the existing PT? using 2x22uf caps and resistors to manage current voltages? OR should I use a separate transformer feeding the FX Loop?
Again thanks for your help, little steps at a time, it seem things are moving along !
Humble and Dumble
Fred.
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