Altec 436 PCB

[Nadege]

Ok, here is the version 3.1 of the pcb

Checked dimensions for the transformers, caps and resitors

Better heater tracks

some other minor change

PCB:

http://i251.photobucket.com/albums/gg312/Nadege1509/altec436PCBv31.jpg

layout botom:

http://i251.photobucket.com/albums/gg312/Nadege1509/altec436v31bottom.jpg

Layout Top:

http://i251.photobucket.com/albums/gg312/Nadege1509/altec436v31top.jpg

Dimension:

http://i251.photobucket.com/albums/gg312/Nadege1509/altec436v31dimension.jpg

enjoy

 

[Schmilsson]

Neat!

Can I bother you with the footprint and size of the 9745?
Did you figure out the psu to match the hammond trafo btw?

 

[dustbro]

How is the progress going on this project?

 

[Nadege]

hi,

didn't had so much free times this weeks. I'm planning to etch the first prototype in a few weeks

 

[fazeka]

[quote author="eskimo"]Btw, have you seen any alternatives to sowter for in and out? I just realized they listed their prices without 17%vat. 160€ for both is a bit hefty.[/quote]

There's a fellow with a clone on eBay.

Apparently, he's using the Edcor WSM10k/10k on the input and the Edcor XSM15k/600 on the output.

What does everyone think of these? At $23 for both, I'm wondering how these compare to the Sowters (which are 7 times more expensive)? Maybe that's the reason why the seller is selling it (not very good sound)?

Also, why not for the input use WSM10K/15K or WSM15K/15K (according to original Altec schem)?

 

[emrr]

the original Altec input is not 15K:15K, it's a 1:2 step-up. And the output is 28K:600. And the core material will certainly sound different than the Edcor steel, no matter what any response measurements suggest.

 

[Nadege]

Hi

still haven't had any time to complete this project, as I've installed my new studio...

When It will be finished I'll make a test with the edcor...

 

[fazeka]

[quote author="emrr"]the original Altec input is not 15K:15K, it's a 1:2 step-up. And the output is 28K:600. And the core material will certainly sound different than the Edcor steel, no matter what any response measurements suggest.[/quote]

OK, I see that Sowter 3575 has it at 10K:10K, 1:1. I thought Brian would have cloned an original Peerless 4651A?

 

[emrr]

[quote author="fazeka"][quote author="emrr"]the original Altec input is not 15K:15K, it's a 1:2 step-up. And the output is 28K:600. And the core material will certainly sound different than the Edcor steel, no matter what any response measurements suggest.[/quote]

OK, I see that Sowter 3575 has it at 10K:10K, 1:1. I thought Brian would have cloned an original Peerless 4651A?[/quote]

Most of the Sowter vintage clone ratios are incorrect, if you want to get picky. Sure they work.

 

[1954U1]

Hi Nadege,
any news on this great project?
Do you've tried the thing? 

 

[emrr]

You're screwed.  ;D  The "A" versions lack the secondary CT, and the DC bias goes entirely through the attenuator resistance.  The "B/C" versions have CT secondary and the DC resistance becomes much lower. 

Some increase in speed due to lower timing resistance?  Negligible on Altec's paper.  Better balance for sure, given tolerances on dual pots.   

Most limiters like this use a CT sec input xfrmr.  Note the ever-popular Gates Stalevel is like the Altec "A" versions, and does not. 

 

[ChrioN]

Even though this is the perfect p2p; Did anyone make this PCB? I see another version available elsewhere, but at 150 dollars, I can't afford it.

 

[Schmilsson]

I always find it mind boggling how people wanna PCB this thing. I mean, the audio circuit is this easy! For the side chain add a 4 point terminal. Done.

 

[ChrioN]

Tell me eskimo: what app did you use to draw that layout? I can tell you're on a mac

 

[Schmilsson]

busted by the .png eh?

I'm using illustrator

 

[dustbro]

http://dripelectronics.com/ALTEC436.html

 

[ChrioN]

...Or maybe I can afford it, but won't put 150 dollars in a board 
Thats just me.

I see another version available elsewhere, but at 150 dollars, I can't afford it.

 

[emrr]

His boards are overpriced, and for what real reason I'm not clear. 

 

[kazper]

I'm thinking that the weight of the transformers mounted on that PCB's isn't exactly a good thing.

 

[reboot]

hello

NEVER BUY drip electronic..... for the price ...

THERE IS NO SCHEMATICS !!!  the forum is broken ...i'm not happy .