The making of Frank's Sister

[Nils]

This will be the tread of one of my amp Projects. And i have called her Frank's Sister. Hopefully this will be a detailed worklog for this amp

The beginning



Heatsink ready to get Shorter



Correct length.







And here with Boards inn for mockup



This is how far i have come now, i have forgot to take pics of the drilling. Next step is to figure out how to do the wiring and endplates, and some other small issues

[todd217]

looks good,are all the connections going to be on one side?

[ttocs]

Thanks for sharing looks like fun. How do you tap the holes for the transistors that do not go through the sink? Just drill a hole and use a harder-metal screw to cut the threads and seat it itself?

[zztunnell]

Where in the world did you find a raw heat sink that long? Did you have it machined yourself?

This is the start of something VERY cool!!

[Kirghiz]

Very cool!

What are the amps you are building this out of?

[vwdude]

Where in the world did you find a raw heat sink that long? Did you have it machined yourself?

This is the start of something VERY cool!!

My question and thoughts exactly. This is a very cool project. Il bet you can replace the power and ground connector on the end board with 4 gauge ones and then run 8 gauge wires to each board. Also, I would have left more room on the preside to allow for wiring up the individual gains, RCAs and other eq controls. May e would have even set the end plates an inch in to make the connectors hidden.

[itchnertamatoa]

now that's going to be interesting ... where's the suscribe button????

[Nils]

Thanks for feedback, funny that no one have mentioned the pink dotted amp in the middle

@todd217: That is the plan to have all conections on one side, it will be a tight fit, i will try to get close to "original" look as possible.

@ttocs: i have drilled out the holes first and tapped them out

@zztunnell: well i have got them made for me, they are 96% similar to the original heatsink, have a couple of lengths of 4 meters you can also take a look at this link: http://www.phoenixphorum.com/viewtopic.php?f=3&t=18640

@Kirghiz: there will be 3 MS275 boards

@vwdude: when it comes to wiring i haven't decided yet, maybe gold bars maybe wire, i also have some issues regarding to bass eq (wich i wil newer use) and gain how to make it look nice and original
A lot of thinking

This amp will be a "test rabbit" as we say in Norway, i have 3 more amps to "build" that are bigger than this one. This is the amp that i can make mistakes on, the tre others i can't

I'll try to ceep this updated

[ttocs]

when the hole doesn't go through the sink, how do you tapp them?

[groundpounder]

With what is called a bottom tap. It is square or blunt on the end and made just for tapping such a hole.

[Nils]

when the hole doesn't go through the sink, how do you tapp them?

You use a bottom tap as groundpounder says, there are different taps for different jobs the tap i used isn't actually a bottom tap, but the closest you get, as you can see on the pic it has a "cone" like the drillbit, when you have drilled a hole it is much easier to feel when you hit bottom, this tap has treads all the way down sorry that i missunderstand Your question

[ttocs]

ah ok thanks never had to do one and was wondering.

[Nils]

A little update, playing With different ideas how to solve the endplate layouts, here is one:

[PhuckinGood]

Great thread, more please ....

[Macgyver76]

In the name of saving space on the end how about a six over six terminal for the speaker connections like they used on the TI900.7?

[Nils]

Great thread, more please ....

Thanks, I'll try to keep this tread updated

[Nils]

In the name of saving space on the end how about a six over six terminal for the speaker connections like they used on the TI900.7?

I will check this out, but I will try to keep this as "original MS look" as possible and Eric, I know I need your experience and knowledge about a couple of issues on this project

[marko]

I would use both ends for terminals rather than try and squeeze them all on one side, every LE amp is like that anyway.. maybe power/remote on one end and speaker/rca on the other.

[joerg]

As soon as somebody comes up with an oldschool amp project all the blokes come crawling out of their hideouts.

Great project! Keep us posted. Hopefully you´re using metric screws...

[marko]

As soon as somebody comes up with an oldschool amp project all the blokes come crawling out of their hideouts.

Great project! Keep us posted. Hopefully you´re using metric screws...

I still frequent these forums on a regular basis, I just don't have anything to show right now but fear not I have ideas brewing for the Skoda!!

by the way, what's with the "metric" business? MS amps had imperial screws didn't they?

[Nils]

I would use both ends for terminals rather than try and squeeze them all on one side, every LE amp is like that anyway.. maybe power/remote on one end and speaker/rca on the other.

I Think i have to try out a couple of different layout's the internal wiring have to look nice also. Thanks for input

[Nils]

As soon as somebody comes up with an oldschool amp project all the blokes come crawling out of their hideouts.

Great project! Keep us posted. Hopefully you´re using metric screws...

Thanks Joerg, and of course there is metric here on this project there will be a mix I think, but on the other three I think I will do imperial...

[vwdude]

Any updates?

[Nils]

Any updates?

Sorry, progress is slowly, I'm just collecting parts, cables and terminals. I will try to cut out some test endplates during next week

[Nils]

A mini update

Can you see the difference? this is original and "original" this is why i'm searching for all the odd parts



Can anyone see wich one that is the original? And tell me why