New Amp Build Thread- Modulus Marshbar

  • Thread starter Thread starter MadAsAHatter
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MadAsAHatter

MadAsAHatter

Well-known member
I've been working on the first of my two new project amp kits I ordered from Modulus Amplification in the UK back in February. This one is called the Marshbar 50. Like the name implies it's a take on a Marshall style amp. It's 50 watts with Gain, MV, BMT, Presence & Resonance controls. There is a bright switch that selects between 2 value bright caps. There's also a 3 way switch to select Plexi, JCM800, or SIR34 type tones.

Quick ordering timeline and tariff info if any of you are wondering.
-February 6th kits were ordered.
-March 5th kits were shipped.
-March 11th kits arrived.
-I did have to pay a tariff of $63.20 which amounted to 5% of the purchase price of the two kits not including shipping. UPS paid the tariff up front on my behalf then sent me a bill for that amount. I was sent a link to pay online. They wouldn't deliver until I paid the bill. Paying the bill before the scheduled delivery date saved me $12 in UPS processing fees, otherwise they'd tack that on for having to hold the shipment longer.

So far everything on the Marshbar kit looks to be of high quality. I did purchase a couple upgrades on components like F&T filter caps, Mallory coupling caps, and CTS pots. Each kit came in its own box with everything packed up really well. Transformers were wrapped up in bubble wrap and cardboard. Small components, hardware, and turret board were placed inside the chassis with packing material to keep them from shifting around. Faceplates were wrapped in bubble wrap and sandwitched between a few pieces of cardboard. Everything was placed in the box with packing material all around to keep it from shifting during shipment. All arrived safe and sound.

I have run into a few minor issues with the chassis. They weren't anything someone who is building a kit shouldn't be able to take care of easily, but something to look out for if you do order this kit for yourself. Everything else checks out and looks good to go.
1. There was no hole drilled for the bright switch so I had to drill one.
2. One of the mounting holes for the turret board was in the wrong spot so I had to drill that in the right spot.
3. The hole for the pilot light was slightly undersized so I had to widen it.
4. They sent a preamp socket hole cover instead of an octal socket cover. Not a big deal as I had a spare one to use.

First up was building the headshell. Between having other responsibilities and crap weather on the weekends it took me a little over a month to have the time to compete the headshell. There are still a few minor things left to do like make & mount the badge, but for all intents and purposes I completed the headshell last week.

Pics below with the faceplate mocked up. Don't pay the "badge" much mind. That's just a paper printout to get the sizing and color right. I'll be making it out of acrylic with a waterslide decal.

Since I have more free time during my lunch, other breaks, and such at work than I do at home I decided to bring all my stuff to work on the kit there. I got all the transformers, tube sockets and other hardware mounted this week. This took longer than it should have because of those minor issues with the chassis I mentioned above. I had to bring the chassis home with me a couple times as I came across them to get it situated. It's not like I can drag my drill press up to the office with me to have on hand LOL!


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I've been considering one of his kits so I'm looking forward to updates. Have you been in communication with him at all? Did you just go to his site and select the kits, add them to your cart, checkout and pay for them all through the site with no interaction with Michael?
 
🍿

I've been considering one of his kits so I'm looking forward to updates. Have you been in communication with him at all? Did you just go to his site and select the kits, add them to your cart, checkout and pay for them all through the site with no interaction with Michael?
Since I wasn't needing anything out of the normal I didn't contact anyone a Modulus. I just selected kits and options through the site and placed an order.
 
Headshell turned out great! Love the piping. Logo should be baller too once you get it done.
 
Moving along nicely, but I've also hit a tiny snag that has me scratching my head a little.
Now that I've populated the majority of the small components it appears there are some discrepancies. Everything that was listed on the bill of materials was accounted for, but there are 3 components shown on the layout that are missing. A 10k-1watt and 1ohm-2watt resistor and and 47pf cap are missing. I also have a handful of components that aren't shown on the layout at all. None of it looks like it would just be a substitute part. I have 33k, 52k, 250k and a few others all 1 watt resistors and a 100pf cap left over.

It looks like I should be able to steal those couple of components from the Frankentone kit I also bough to keep me going, but I'll still need to replace them before I start on that build. I'd assume I could get Modulus to send me what's missing, but I'm not going to bother since they're on the other side the globe. I'll just order from Amplified Parts or something; It'll be more convenient for me. At least I need to grab other things where I'll get free shipping and not have to pay $10 for $0.75 worth of parts.

Anyway, other than this little hiccup things are moving along well. Here's where I left off this morning. Board is almost fully populated.

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Moving along nicely, but I've also hit a tiny snag that has me scratching my head a little.
Now that I've populated the majority of the small components it appears there are some discrepancies. Everything that was listed on the bill of materials was accounted for, but there are 3 components shown on the layout that are missing. A 10k-1watt and 1ohm-2watt resistor and and 47pf cap are missing. I also have a handful of components that aren't shown on the layout at all. None of it looks like it would just be a substitute part. I have 33k, 52k, 250k and a few others all 1 watt resistors and a 100pf cap left over.

It looks like I should be able to steal those couple of components from the Frankentone kit I also bough to keep me going, but I'll still need to replace them before I start on that build. I'd assume I could get Modulus to send me what's missing, but I'm not going to bother since they're on the other side the globe. I'll just order from Amplified Parts or something; It'll be more convenient for me. At least I need to grab other things where I'll get free shipping and not have to pay $10 for $0.75 worth of parts.

Anyway, other than this little hiccup things are moving along well. Here's where I left off this morning. Board is almost fully populated.

View attachment 448843
Looking good... you should email Michael. He'll probably get back to you quickly and at least explain why they weren't included, etc. I'm looking forward to hearing how this sounds.
 
Turret board is complete. Well I do want to quadruple check everything for mistakes and make sure all my solder joints are good. I'll come back to that later. I'm moving to soldering stuff inside the chassis now. I just started that so nothing too interesting to post yet.

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This is awesome! Looking forward to hearing your report! I would love to build an amp.
 
Now we're starting to get somewhere. Got the mains and heaters mostly wired up and the board mounted in the chassis. It still looks like a plate of spaghetti, but I did get the board wires roughly routed in the direction they need to go. I'm hoping between today and tomorrow I can at least finish off wiring a couple of the tube sockets.

And fuck all if I didn't sorta mess up. Somehow I accidentally flowed solder into one of the pinholes in the V1 preamp tube socket. Now I have to get a replacement. On the bright side it's on the end of the chain and I had only wired the heaters to it. So not a big deal to fix, but a mistake that could have been avoided.

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That's a good looking kit. I remember my first amp build in 2005...........:rock::yes: There's nothing more gratifying than building your first amp by your own two hands and then hitting the standby switch.:2thumbsup:

Congrats Mr. Hatter! Thanks for taking us along for the ride! Enjoy the journey, it's alot of fun!:cheers:
 
That's a good looking kit. I remember my first amp build in 2005...........:rock::yes: There's nothing more gratifying than building your first amp by your own two hands and then hitting the standby switch.:2thumbsup:

Congrats Mr. Hatter! Thanks for taking us along for the ride! Enjoy the journey, it's alot of fun!:cheers:
Thanks man. This would be amp build #3 for me, but the most complicated one so far. The first two I did were simpler designs; one a single-ended Class A take on a JTM45 and the other a Fender Champ derivative. So for this build hasn't been much more complicated than the first two, just more components and wires to keep track of.
 
You are moving fast.. looks great!
Yeah, I'm moving faster than expected. If I keep up the pace I may be done one day next week.
Really I'm only working on it maybe an hour or two a day. After that I start going cross-eyed. That's when I start to mess things up. I'll get to a good stopping point and put it down for that day's session.
 
Yeah, I'm moving faster than expected. If I keep up the pace I may be done one day next week.
Really I'm only working on it maybe an hour or two a day. After that I start going cross-eyed. That's when I start to mess things up. I'll get to a good stopping point and put it down for that day's session.

I have no idea how people can do this for hours at a time without messing stuff up. I can only do an hour or two at a time before i need to take a break with amps or i just start making mistake after mistake.
 
Yeah, I'm moving faster than expected. If I keep up the pace I may be done one day next week.
Really I'm only working on it maybe an hour or two a day. After that I start going cross-eyed. That's when I start to mess things up. I'll get to a good stopping point and put it down for that day's session.
You're probably a better builder than me but I didn't move that fast with my Mojotone Brit 50. I'm hoping the design of the Modulus is just better than Mojotone so I can move faster next time if I get one from them. I've always wanted to get a kit from Modulus but was a little afraid.. thanks for taking us on this journey with you. I'll definately be buying from Michael if I decide to build another. He recommended the 20 watt Deep Fried Marshbar for me.
 
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