The Multi Amp aka Dynalo Mk2

[RudeWolf]

Looks great! How much was it grand total?

[GrindingThud]

Wow, that looks really good!

[Kerry]

Awesome John!

[Rossliew]

Beautiful! Now...get yourself a dynamic can and let us know how it sounds

[johnwmclean]

^ I acquired a pair of Ether Flows.

On 14/03/2017 at 0:58 AM, RudeWolf said:

Looks great! How much was it grand total?

Hey who's counting? This is Head Case dammit.
 ... around $320US plus shipping.

[wink]

[nopants]

ouch, maybe time to revive the group buy thing again

[sbelyo]

at 75 pieces it goes down 30%

I'll take some time this week to see if I can get a proper dollar amount

[ang728]

Finished assembling this,pretty comfy color

 

 

 

 

Edited April 3, 2017 by ang728

[Rossliew]

5 hours ago, ang728 said:

Finished assembling this,pretty comfy color

 

 

 

 

How would you describe the sound? Top and bottom units are identical except for the orientation of the power inlet?

[UFN]

That looks fabulous - and I love the color!  

How did you get that finish, because the cases look like the eBay-ones that are normally silver?

//UFN

[joehpj]

Those were a GB ang728 and I ran locally. It was supposed to be silver, or grey, or gun metal - at least in our imagination. We ordered something like that. When the factory gave us some pictures of those...Say 30 of those. It's simply too late. It was done by accident and I assume it's impossible to reproduce again. I believe something was wrong in that anodizing sink. Who knows. I love them a lot. Because of the color, the power indicator is also green.

 

[ang728]

1 hour ago, Rossliew said:

How would you describe the sound? Top and bottom units are identical except for the orientation of the power inlet?

Yes,both amps are the same except the orientation of the power inlet

 

[UFN]

17 minutes ago, joehpj said:

Those were a GB ang728 and I ran locally. It was supposed to be silver, or grey, or gun metal - at least in our imagination. We ordered something like that. When the factory gave us some pictures of those...Say 30 of those. It's simply too late. It was done by accident and I assume it's impossible to reproduce again. I believe something was wrong in that anodizing sink. Who knows. I love them a lot. Because of the color, the power indicator is also green.

Heh, OK - as accidents go I think it's a happy one 

 

//UFN

[johnwmclean]

Beautiful work!

[Pars]

Yes, very nice work, and love the color! Are those based on Kerry's mini board?

[ang728]

1 hour ago, Pars said:

Yes, very nice work, and love the color! Are those based on Kerry's mini board?

it fits with full-size one not Kerry's mini board  

[HemiSam]

Any internal shots?

HS

[ang728]

1 hour ago, HemiSam said:

Any internal shots?

HS

Still crappy wiring jobs

[johnwmclean]

I like the PSU partition .

Very nicely thought out details.

[JoaMat]

You seem to have a very fruitful collaboration, ang728 and jeohpj. Congratulation to really nice amplifiers.

[RudeWolf]

Hey guys! What's the currently approved best solution to cool mini Dynalo transistors? @johnwmclean , did you have much luck with thermal tape?

[grawk]

https://en.wikipedia.org/wiki/Fluorinert

 

[johnwmclean]

9 hours ago, RudeWolf said:

Hey guys! What's the currently approved best solution to cool mini Dynalo transistors? @johnwmclean , did you have much luck with thermal tape?

Options are limited;

1) Use a permanent epoxy/glue and risk not being able to access parts again. 

2) Use non permanent tape/glue and risk the heatsink becoming loose and shorting something.

3) Let em run hot.

I’ve adopted option 3, have measured ~74°C, with an ambient of 24°C after an hour fully cased. Not ideal, but not catastrophic and well within running spec. 

 

[RudeWolf]

Thanks for the info! I have considered glueing small carpentry nails to each of the transistors. Epoxy or super glue might hold them well enough.