Got all the parts needed for the whole restoration, thanks to UK, US, German and Italian providers
Before reforming Daly caps, I have to fixe the lighted rocker power switch : the bulb is 'on' all the time. The PT is a Dagnal T3836, not a T4145 specified by the Marshall schematic, but both seem to have the same color code. I think the power switch is wired backwards and the stand-by switch aswell, Hoffman's diagram accredit my thought (
http://www.el34world.com/charts/images/mar_switch.gif" onclick="window.open(this.href);return false;)
here is the picture:
Power switch:
12/ Orange from PT primary (0v)
25/ Yellow from Mains fuse
11/ Blue from IEC
24/ Brown from IEC
Stand By switch:
12/ Blue wire from diode rectifier
25/ Blue wire from diode rectifier
11/ Blue from PT secondary (HT)
24/ Black from PT secondary (HT)
I have changed fuses, they were wrong value when I inspected them. By the way, I noticed that the Blue wire - common - from the IEC is grounded on V7
, I have to move it at the right place!
I did some research about rocker switch wiring, at Amp Archives it seems that the '77 2203s are wired as mine
According to the Hoffman's diagram my amp is wired backwards, and with SDM schematic I'm between two options listed. I know
only one is OK
Here is the Unicord schematic redraw by Brian, the one I would like to follow:
- 2203_pwr by Brian Wallace 12.25.05.gif (11.75 KiB) Viewed 3533 times
So before I rewire the switchs, what do you suggest ?
PS: sorry for my accent