Neil special

Get support and show off your MetroAmp 50 Watt kit builds.

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hebaton
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Neil special

Post by hebaton » Sat Jan 30, 2021 7:41 am

CAn anyone tell me where the full specs to build the "Neil Speacial" can be found ?
Please ?

danman
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Re: Neil special

Post by danman » Sat Jan 30, 2021 6:05 pm

The only available info that I'm aware of is the layout on SDM's site. The amp can be built on a 50 watt or 100 watt chassis so just get the appropriate OT for either one. The PT you use is up to you depending on what wattage amp you want to build and what you want your final B+ voltage to be. Everything else is basic Marshall spec.

https://drive.google.com/drive/folders/ ... zd3STVYd3c

Explorerman
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Re: Neil special

Post by Explorerman » Mon May 03, 2021 5:46 pm

I was also looking into a build using this 2 in 1 a couple of years ago, ended up building a 5e3 as well as an 18w TMB over the past two years. Those builds worked out really great and now back looking at ordering parts for the for 1987 first, then once up and running the 2204 and 1987 in one. One question I have about this layout: what is the purpose of the 0.0022 cap connecting between the switch and the bright vol pot? The switch puts it in series with the existing 0.022 cap that both the 2204 and 1987 has, but both of them don’t have this 0.0022 cap.

danman
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Re: Neil special

Post by danman » Mon May 03, 2021 6:53 pm

Depending on the actual year of the circuit, both of these models ran a .0022uf coupling cap on the first stage of the bright channel. Some of the older circuits used a .022uf in this position but as the years progressed, Marshall switched to the .0022uf cap to help cut a bit of low end and tighten the sound a bit.

Explorerman
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Re: Neil special

Post by Explorerman » Mon May 03, 2021 7:19 pm

Cheers, yep I have seen that, however the 2 in 1 layout in the mods section shows a 0.0022 in series with a 0.022 (the 1987 and 2204 have on or the other, not both in series) - I don’t really understand the purpose of the extra 0.0022uf?

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