Hi guys,
Just pulled the trigger on one of these. Looks very clean. Will be delivered next week. I saw a you tube clip of a Guy who Mods PA amps in particular (I think the clip was for a Selmar PA amp). Gets some amazing tones and flexibility from the amp. This prompted me to get the Marshall which is basically a 2203 circuit.
Marshall 100 Master PA
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andresound
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Marshall 100 Master PA
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andresound
- Posts: 701
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Re: Marshall 100 Master PA
Some more pics. Anyone have a schematic and ideas on mods?
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Re: Marshall 100 Master PA
here's the 50w schematic http://www.drtube.com/schematics/marshall/2002.gif
Your model is a 100w with six inputs
Your model is a 100w with six inputs
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andresound
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andresound
- Posts: 701
- Joined: Mon Dec 01, 2014 8:48 am
- Location: Durban South Africa
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andresound
- Posts: 701
- Joined: Mon Dec 01, 2014 8:48 am
- Location: Durban South Africa
Re: Marshall 100 Master PA
Open to suggestions.
CH1 - stock
Ch2 & 3 - cascaded/bridged (high gain)?
CH 4 - Plexi
CH 5 - BASS ?
CH 6 - ???
Anyone seen what this guy (Hermansson Amplification) does to Vintage PA amps?? Great tones and flexibility. He has a Facebook page and builds neat stuff.
https://youtu.be/oO2yVAIQgMM
CH1 - stock
Ch2 & 3 - cascaded/bridged (high gain)?
CH 4 - Plexi
CH 5 - BASS ?
CH 6 - ???
Anyone seen what this guy (Hermansson Amplification) does to Vintage PA amps?? Great tones and flexibility. He has a Facebook page and builds neat stuff.
https://youtu.be/oO2yVAIQgMM
If it sounds good, it is good! Trust your ears
Re: Marshall 100 Master PA
it's easy to tweak coupling caps after the first gain stage, as well as cathode resistors and caps on the first gainstages and volume bright caps.
The problem, however, is that marshall used a 500is pf cap on one mixer resistor on most guitar amps and this will affect all the other channels. So you may need to compromise
The problem, however, is that marshall used a 500is pf cap on one mixer resistor on most guitar amps and this will affect all the other channels. So you may need to compromise
www.myspace.com/20bonesband
www.myspace.com/prostitutes
Express, Comet 60, Jtm45, jtm50, jmp50, 6g6b, vibroverb, champster, alessandro rottweiler
4x12" w/H75s
www.myspace.com/prostitutes
Express, Comet 60, Jtm45, jtm50, jmp50, 6g6b, vibroverb, champster, alessandro rottweiler
4x12" w/H75s
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dorrisant
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Re: Marshall 100 Master PA
Switch it out with a relay maybe?
I used switched volume pots on my Traynor YBA- 1. When you turn either channel down enough to click it off, then you remove it from the mixing point and isolate the other channel. It is quite a boost.
I used switched volume pots on my Traynor YBA- 1. When you turn either channel down enough to click it off, then you remove it from the mixing point and isolate the other channel. It is quite a boost.
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