Am I in trouble with this?

Ricky Lee · Post by **Ricky Lee** » Sun May 15, 2005 6:01 pm

First time at any type of electronics, so am I in trouble, or can I continue? Also, the wiring diagrahm refernces a filter cap fuse holder, what and where is that located. I get the filter cap (red wire off of cap) but not the fuse holder joined with it. Sorry for all the links.

Pic 1 http://img234.echo.cx/img234/1556/pic13er.jpg

Pic 2 http://img234.echo.cx/img234/9577/pic26wu.jpg

Pic 3 http://img217.echo.cx/img217/1756/pic38ft.jpg

Pic 4 http://img217.echo.cx/img217/6914/pic49rl.jpg

Pic 5 http://img217.echo.cx/img217/6788/pic50vs.jpg

Pic 6 http://img155.echo.cx/img155/9421/pic63wp.jpg

Pic 7 http://img155.echo.cx/img155/2765/pic72ql.jpg

Pic 8 http://img155.echo.cx/img155/8018/pic82sh.jpg

Billy Batz · Post by **Billy Batz** » Sun May 15, 2005 6:10 pm

The power supply flow goes as follows:

- 2 blue HV secondary taps from the PT to the standby switch
- 2 blue wires from the stanby switch to the board snubber caps or rectifier diodes. Bridge recto in 100 watters negative side is grounded at the mains filter ground. (The mains filter section is the 2 cans in the grouping of 4 nearest to the PT)
- Yellow wire (?) from recitifer (bridge recto positive) to main filter cap.
- Red wire from main filter cap to HV (filter cap) fuse. Thats the other fuse on a Marshall (the one not used with the power cord wires).
- Either the OT White primary wire and choke are connected to the other HV fuse terminal OR a red wire goes from the other HV fuse terminal to a turret on board where the White OT CT wire and choke are also soldered to.
- The other choke wire is soldered to a turret on board with a mounted 10k 2W resistor along with the yellow wire to the Power tube screens and a wire to the screens filter section (2 cans in the grouping of 4 closer to the board).
- The rest is on board

Ricky Lee · Post by **Ricky Lee** » Sun May 15, 2005 8:17 pm

Is this correct?

Billy Batz · Post by **Billy Batz** » Sun May 15, 2005 8:57 pm

Looks right to me.

Dax-The-Ax · Post by **Dax-The-Ax** » Sun May 15, 2005 10:07 pm

I see a few problems with the wiring and on V3, the yellow wire that is on pin 8 should go across to pin 3 also. Shared cathode.

Billy Batz · Post by **Billy Batz** » Sun May 15, 2005 10:12 pm

Good eye. Thats had a few people scratching their heads when they fired their amps up.

Dax-The-Ax · Post by **Dax-The-Ax** » Sun May 15, 2005 11:19 pm

Don't forget to add the red wire from the caps attached to the blue wires to the botton right filter cap. I don't think this is mentioned in the instructions. And make sure pins 4 and 5 of V1, V2 and V3 are connected.

You have the Red Filter Cap/Fuse Holder correct, the instructions mean the red wire from the filter cap that has the wire from the fuse holder connected to it. It's only one red wire on the board like you have it.

Ricky Lee · Post by **Ricky Lee** » Mon May 16, 2005 3:43 am

I don't have any Sozo 22uF caps for the standby thing - only Mallory 22uF. Is it ok to use the Mallory with Sozo, or will they effect the tone? Also, the installtion guide shows the green power cord fasten to the side of the chassis, my chassis doesn't have the hole there, where is an alternate place to put it or do I need to drill a hole?

Flames1950 · Post by **Flames1950** » Mon May 16, 2005 7:48 am

You can attach the green earth ground from the AC cable to that first filter cap can's ground lug instead (the can under the fuses.)

Dax-The-Ax · Post by **Dax-The-Ax** » Mon May 16, 2005 3:50 pm

Mallory 22uf should be fine.