Lead 100 Watt started

[angelodp]

Hey, I am building this for a young player (16, pal of my grandson), good kid, loves Van Halen.

I am using the Mojo kit and the Metro build guide, so far so good. I may need some advice as I move into this, but the Metro guide seems pretty complete.

Wish me luck.

A

[Stevem]

Your really not doing the kid any service by it being a 100 watt amp build if I might say so regardless of him being into Eddie!

30 watts rms into a 2-12" cabinet, no less a 4-12" cab is plenty of volume and punch for a 16 year old leaner who's got like 3 years ahead of him before getting out and playing a club.

[angelodp]

Yup I told him all that and he insisted and bought the amp. Kids.

[sluckey]

I am using the Mojo kit and the Metro build guide, so far so good.

I bet that will cause a few headaches.

[angelodp]

First small glitch, the PT OT are 90 degrees from what is pictured online ( Mojotone), but 90 degrees to each other. The Choke will not mount 90 degrees to the OT. Is it advisable to drill new holes so the choke is 90 to the OT?

A

[sluckey]

The choke is fine as is.

[angelodp]

Thanks

The Mojotone info is a bit sketchy, they assume you are at the higher level. I am thinking that the Metro guide version of the ground scheme is close to the originals. If you are familiar with that guide, would you recommend that ground scheme. Back of pots for tone stack and pre-amp, with various segregated grounds on the B+ etc.

[Roe]

use the larry, multi-star grounding, not the metro grouding

[sluckey]

Metro has good stuff and good docs. I doubt the Metro and the mojo are exactly the same though. The little differences may lead you down a dark rabbit hole. Maybe you could post the Metro docs here rather than me having to track 'em down.

[angelodp]

Hi Steve, the Metro doc is way too big to post here. I can send it to an email if you like?

I see that the two have differences and I will have to be careful to use appropriate info.

Ange

Here's a google drive link

https://drive.google.com/file/d/1kF4SF0 ... sp=sharing

[martin manning]

Link to 100W build guide (21 MB) on Valvestorm site: http://valvestorm.com/1969%20Kit

[angelodp]

This amp has a PT as shown with the following Primary and Secondary wires.

But.... the thin green and white wires (on the secondary side) are coming out of the primary side bell!

I take it this is a bias tap routed to the other side within the housing?

[martin manning]

This amp has a PT as shown with the following Primary and Secondary wires.

But.... the thin green and white wires (on the secondary side) are coming out of the primary side bell!

I take it this is a bias tap routed to the other side within the housing?

The diagram shows it’s a separate 100V secondary winding, typical for 100W Marshall.

[angelodp]

Hi Martin, yes I understand that and thanks, its just that those two wires are coming out of the primary side of the transformer.

[martin manning]

No worries. Electrically it’s a secondary.