Please guide me along my 12xxx project

Jetmarshall · Post by **Jetmarshall** » Sat Jul 25, 2009 5:14 pm

Some updated pictures

Jetmarshall · Post by **Jetmarshall** » Sat Jul 25, 2009 5:16 pm

Power and Standby Switches

Jetmarshall · Post by **Jetmarshall** » Sat Jul 25, 2009 5:18 pm

What it looks like now.

Omn · Post by **Omn** » Sat Jul 25, 2009 5:20 pm

Trim anything sticking out after soldering. It will act as antennas.

Both lower lugs on the power switch should be soldered.

Omn · Post by **Omn** » Sat Jul 25, 2009 5:32 pm

Like SDM has it in his great layout. Add Billy Blatz 1968 layout for the differences in the power section and you have a nice map.
http://home.comcast.net/~jbjdav26/1959/ ... 0grids.JPG

Jetmarshall · Post by **Jetmarshall** » Sat Jul 25, 2009 8:31 pm

Omn wrote:Trim anything sticking out after soldering. It will act as antennas.

Both lower lugs on the power switch should be soldered.

Trim extra leads: Done.

Solder both lugs on the power switch via buss wire: Done.

Thanks.

Jetmarshall · Post by **Jetmarshall** » Sat Jul 25, 2009 8:34 pm

I've put aside work on the main chassis for now - need to figure out some stuff.

Here are some pictures of the Caps board.

basisfunction · Post by **basisfunction** » Sun Jul 26, 2009 12:58 am

Power section is looking good. Now those wires just have to go to the right places...

Jetmarshall · Post by **Jetmarshall** » Tue Jul 28, 2009 11:17 pm

I am populated the board now, using different layouts found on the forum. Here are the two main ones that I am using. I know many of the Marshalls had different components during that era - can anyone comment on how these two different layouts affect tone?

Early 68 and Alt Ground 68 on Metro Wiki:

http://metroamp.com/wiki/index.php/1959_chassis_layout" onclick="window.open(this.href);return false;

SDM's layout:

Papag · Post by **Papag** » Wed Jul 29, 2009 10:04 am

On the wire side of the caps board....don't forget to solder the turret where the 2 red wires connect at the top of the picture (if you haven't already).

Jetmarshall · Post by **Jetmarshall** » Thu Jul 30, 2009 7:31 pm

Thanks. It doesn't look like there is solder in there, but it has been soldered. I went back and filled up the turret with some more solder.

Jetmarshall · Post by **Jetmarshall** » Thu Jul 30, 2009 7:38 pm

I have the main board done, except for 2 1M resistors (waiting for them to arrive). How am I doing?

I can actually see the end now! Except for the buss wire connecting all pots, the wires just need to go to the right places.

I will have to leave the amp for a while (getting married next week). When I return, I hope to finish the beast. Thanks to everyone who commented on my progress.

Will be back soon.

Omn · Post by **Omn** » Fri Jul 31, 2009 7:43 am

The two bias caps needs to be reversed, at least from where I stand. The bulged ends (plus) should be against the front of the chassis.

Structo · Post by **Structo** » Fri Jul 31, 2009 12:26 pm

Yes, that is a sure way to make an amp go BANG! Having the polarity wrong on E caps.

Jetmarshall · Post by **Jetmarshall** » Fri Jul 31, 2009 1:51 pm

Thanks. Missed that one. I've corrected it now.

I've just wired up the buss wire on the pots. Pots can be damaged if they are over heated, right? How do I know if I have over-heated?

Metropoulos Forum

Please guide me along my 12xxx project

Re: Please guide me along my 12xxx project

Re: Please guide me along my 12xxx project

Re: Please guide me along my 12xxx project

Re: Please guide me along my 12xxx project

Re: Please guide me along my 12xxx project

Re: Please guide me along my 12xxx project

Re: Please guide me along my 12xxx project

Re: Please guide me along my 12xxx project

Re: Please guide me along my 12xxx project

Re: Please guide me along my 12xxx project

Re: Please guide me along my 12xxx project

Re: Please guide me along my 12xxx project

Re: Please guide me along my 12xxx project

Re: Please guide me along my 12xxx project

Re: Please guide me along my 12xxx project