1203-80. DIY Layout questions regarding connections.

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1203-80. DIY Layout questions regarding connections.

Postby Homebelly » Sat Mar 17, 2012 5:46 am

Hi..

I'm in the process of getting the parts for a JTM45/100 with a dual rectifier.
I managed to pick up a partial "Kit" off of the metro forum, and i'm getting the other parts i need as they come along.
Mean while i'm drawing up some layouts while i wait.
So.. I have a problem.
Can some one take a look at this picture and give me a hint where i need to connect the two question marked wires to the PT?
[picture removed and replaced-follow link in post further down]
(I also have this posted up on the metro forum)
Last edited by Homebelly on Tue Mar 20, 2012 6:52 pm, edited 1 time in total.
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Re: 1203-80. DIY Layout questions regarding connections.

Postby Brian Wallace » Sat Mar 17, 2012 9:41 am

I would connect the neutral wire from the Bulgin to solder lug G (common). I would also not ground the HT fuse but rather use it to fuse(break)the HT or B+ from the rectifier.

Here is a thread on how you can wire this PT to two different styles of rectifiers.

viewtopic.php?f=2&t=234
Remember....You can fix it with a little extra energy and a positive attitude. ;)
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Re: 1203-80. DIY Layout questions regarding connections.

Postby Homebelly » Tue Mar 20, 2012 6:55 pm

Hi again..

I think i'm edging closer to getting this bad boy hooked up.

Can some one take a look see at this drawing and give me some pointers where i might have gone wrong and where points #3 and #4 get hooked up?..
Image
Rectifier and filter board-2 by Homebelly

Once again.. cheers, any help is good help..




(This is also posted on the metro forum)
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Re: 1203-80. DIY Layout questions regarding connections.

Postby Brian Wallace » Tue Mar 20, 2012 8:30 pm

1) Don't ground the E terminal.
2) Don't run the heater center tap to the rectifier, ground it instead.
3) Run the B+ lead from the rectifier to the fuse then to the switch.

Let me know if this helps.
Remember....You can fix it with a little extra energy and a positive attitude. ;)
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Re: 1203-80. DIY Layout questions regarding connections.

Postby Homebelly » Tue Mar 20, 2012 9:08 pm

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Re: 1203-80. DIY Layout questions regarding connections.

Postby Brian Wallace » Wed Mar 21, 2012 9:52 am

Yes.

Now let's answer where 3 and 4 go.

3 goes to the other side of the choke and to the first power rail resistor which on the 1967 schematic is an 8.2k resistor.
4 goes to the other side of the 8.2k resistor and to the plate resistors of the phase inverter tube.
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Re: 1203-80. DIY Layout questions regarding connections.

Postby Homebelly » Wed Mar 21, 2012 3:13 pm

Thanks Mr. Wallace.
I'll be back with more on the weekend.

Cheers for your help so far.
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Re: 1203-80. DIY Layout questions regarding connections.

Postby Homebelly » Thu Mar 22, 2012 8:40 pm

Okay Brian...
How is this?
Image
Final filter cap hookup by Homebelly, on Flickr
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Re: 1203-80. DIY Layout questions regarding connections.

Postby Brian Wallace » Fri Mar 23, 2012 1:55 pm

You may want to check out this layout. It's not the same filter cap arrangement but there is enough that is the same to get you into the board wiring.

http://www.amparchives.com/Amp%20Archives/Marshall/Schematics%20&%20Layouts/Dan%20Schepise%20Layouts/67-68%20Super%20Lead%20Layout.pdf
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Re: 1203-80. DIY Layout questions regarding connections.

Postby neikeel » Sat Mar 24, 2012 12:17 pm

As per 45/100 build thread

You must do a diagram with the OT, choke and HT hooked up to the spare turret and the other choke wire to the turret you presently have (4) hooked up to and wire (3) to that point. This is the yellow wire seen on the diagram linked to by Brian (this has wire to screens, wire to screens caps and the choke wire).
Then move wire (4) from the PI filter to the board where you have that short red wire at the moment (keep that wire in place as it feeds the PI plates). On the linked to by Brian diagram this is the blue wire from the PI can on top of the chassis. Your amp will only have a single 8k2 dropper where the referred to amp in the link has two in series.

Hopefully you will nearly be there now :wink:
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