Marshall JMP 2204 with Marstran transformers

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Marshall JMP 2204 with Marstran transformers

Postby zerosadness » Thu Aug 15, 2013 6:31 am

Hi,
I started to make my own JMP 2204, I buyed Marstran transformers (139 and 118-2), I've for intructions the 50W metro kit pdf and some layouts.
Image
Image
After I will put some mods like the dual PPIMV, specs like the M&G bluesbreaker ZW, perhaps a Fx loop.

First I started yesterday to wire the amp but I don't understand the 118-2 relative to the standard Marshall PT.
Image

I don't understand what the green wire, red wire, green/yellow and red/yellow correspond on the marstran PT, It's little hard for me because I'm not american or english and I can read with the best accuracy. I don't have problem for the rest of the amp.
I think:
green wires correspond to I & K
green/yellow to J.
red/yellow to E
red correspond to C/D/F/G depending what you choose.
H common is the black.
I'm right?

Hi understanded that the 118-V2 got two differents voltage (high & low), what are the best to be used 2204 JMP? (I would like to make the one with the plexi style box not the standard 80's JCM800 box)

Thanks a lot for your help.
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Re: Marshall JMP 2204 with Marstran transformers

Postby neikeel » Fri Aug 16, 2013 12:43 pm

You need to know what the taps are.
I will post back later
Neil
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Re: Marshall JMP 2204 with Marstran transformers

Postby Brian Wallace » Thu Aug 22, 2013 11:33 am

green wires correspond to I & K
Yes this is correct

green/yellow to J.
Yes this is correct

red/yellow to E
Yes this is correct

red correspond to C/D/F/G depending what you choose.
Yes this is correct

H common is the black.
Common is referenced to the white wire on the AC cord.
Remember....You can fix it with a little extra energy and a positive attitude. ;)
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Re: Marshall JMP 2204 with Marstran transformers

Postby zerosadness » Thu Aug 22, 2013 12:36 pm

Thanks a lot, I finished the amp wiring this night.
Before put the amp on, I check everything, ground etc and I found two things that does not seem normal
- I found ground to chassis on the output jack tip and sleeve.
- I found ground also on the resistor (220K) after the 1N4007 diode.
After, I think all is great. Perhaps all this things happen when an amp is not powered.

- What the difference between High and low voltage?
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Re: Marshall JMP 2204 with Marstran transformers

Postby neikeel » Fri Aug 23, 2013 2:33 pm

zerosadness wrote:- What the difference between High and low voltage?


Low voltage is earlier break up (browner sound), high voltage more headroom.
Neil
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Re: Marshall JMP 2204 with Marstran transformers

Postby dai h. » Tue Aug 27, 2013 6:18 am

zerosadness wrote:and I found two things that does not seem normal
- I found ground to chassis on the output jack tip and sleeve.
- I found ground also on the resistor (220K) after the 1N4007 diode.


Hi,

the output transformer secondary is a long coil of wire (with taps for 4 and 8 ohms--assuming you have 4, 8, and 16) and low resistance, so if one end connects to ground... (you'll have to do a slight bit of thinking here...think of it as a puzzle!
:mrgreen: ).

(Check out the diagram slightly down from the top with the "Ideal transformer and induction law" caption.) :

http://en.wikipedia.org/wiki/Transformer
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