Starting my Wreck board and I have a question

[lgehrig4]

Another question. I was about to start the chassis and for some reason I decided the measure the Alpha pots, which were already installed. Glad I did because one of the 1Meg pots only measured 850K. It happens to be in the bass position. Will it make much of a difference?

Should I leave it, move it to another position or just get a new one?

[jelle]

Just leave it. It is fine for that position.

*ducks for cover*

[lgehrig4]

Thanks. Another question. I was comparing the layout from the build guide to a photo of Francesca and noticed the heaters going from V1 to V2 are switched. The Francesca photo has the wires from V1 going to different pins on V2.

Does this make a difference? I'm not too familiar with the tube components.

Thanks again!

[Blackburn]

Yeah, that's where Ken (mistakenly?) wired them out of phase. You should probably wire them in phase.

[lgehrig4]

The bright switch is wired different too. Fransesca has the middle lug of the switch going to the 3rd lug of the volume pot and the center lug of the volume to the silver micas. The build guide has it reversed.

Should I just go by the build guide and use the Fransesca photos for wire placement?

[Blackburn]

There's a thread about that somewhere. I was in it the other day. This is the better way.

[lgehrig4]

Making some progress. I tried to copy the look of the way he wired the heaters even though I prefer it a little neater. It's difficult to twist this wire. Probably should have gone solid core for the heaters. Slippery stuff.

Can anyone point me to photos the wiring under the boards. I just want to see how the transformer wiring looks

[IMG:800:600]http://i43.photobucket.com/albums/e390/lgehrig4/P1040143_zps9288a28d.jpg[/img]

[IMG:800:600]http://i43.photobucket.com/albums/e390/lgehrig4/P1040144_zpsbdc07ca2.jpg[/img]

[IMG:800:600]http://i43.photobucket.com/albums/e390/lgehrig4/P1040145_zps65b61faf.jpg[/img]

[LeftyStrat]

Just leave it. It is fine for that position.

*ducks for cover*

LOL. To quote Ken, "use your ears."

If it sounds good to you, fuck everyone on TAG.

[M Fowler]

Page 37 of build guide show wires under bias board. Wiring of PT and OT dependents on your transformers such as brand and wires on both ends or only one end. It takes planning to get the bias board, holes/mounting coordinated with the PT/OT, and mounting bolts.

Did you test tone board, cap stack and bias board? The tone board may need to go over to the left more.

Also use short bolts and mount the PT/OT bolts from inside of chassis with nut on top of chassis for clearance.

Mark

[lgehrig4]

Page 37 of build guide show wires under bias board. Wiring of PT and OT dependents on your transformers such as brand and wires on both ends or only one end. It takes planning to get the bias board, holes/mounting coordinated with the PT/OT, and mounting bolts.

Did you test tone board, cap stack and bias board? The tone board may need to go over to the left more.

Also use short bolts and mount the PT/OT bolts from inside of chassis with nut on top of chassis for clearance.

Mark

Great! I read the guide a couple months ago and forgot that. I'm using the Pacific transformers and they are already mounted. I fit the boards in and tested the space for the filter caps. I've been waiting too long for the standoffs from turretboards.com so I'm making my own using those bolts you see and 3/8" nylon spacers. Between those and the nuts it should be about 1/2" off the chassis. I will clip off excess bolts once the boards are mounted. Don't feel like removing them at this point, expecially since two of them are under the transformers.

[M Fowler]

Yeah that will work fine and I did see all that after I posted.

I had to trim the bias board around my switches on one build.

I think the most important thing in that right side of the amp is keeping the wire away from the large 1k/25w resistor, otherwise, we all have to resort to problem solving on individual basis in that right side corner. There is a lot going on with that side of the chassis as you know. Another reason why I like the PCB version of the Express.

Mark

[lgehrig4]

I'm up to the PT now and I'm stumpted. The PT in the layout shows 8 wires and my Pacific transformer has 10.

The only ones that I am sure about at this point are the 2 black that go to the switch. Since color varies I am unsure of the rest.

1. The two wires that go to the bias board diodes (I'm thinking the yellows)
2. The two wires that go to pins 2 and 7 of V5
3. The wires that go to the ground lug
4. The remaining two wires that are not in the layout (snip & cap?)

I don't want to guess to the reprucussions if I am wrong.

[martin manning]

This might help...

[lgehrig4]

I have that already and unfortunately it doesn't. My knowledge isn't to the point where I would know where they go by the voltages. I guess if I knew how to read schematics it would be different, but at this point in time I cannot. Thanks though.

[martin manning]

I have that already and unfortunately it doesn't. My knowledge isn't to the point where I would know where they go by the voltages. I guess if I knew how to read schematics it would be different, but at this point in time I cannot. Thanks though.

Oh jeez... Well, procede at your own risk!

1. The two wires that go to the bias board diodes (I'm thinking the yellows)
2. The two wires that go to pins 2 and 7 of V5
3. The wires that go to the ground lug
4. The remaining two wires that are not in the layout (snip & cap?)

1. Yellow
2. Brown
3. Yellow/Red, White/Brown
4. Yellow/Green Clip the stripped part off, fold the end over 1/2" or so, cover with heat-shrink tube, and coil them up. Secure with a zip tie.