rainton

Re: Universal Audio 176 from scratch - a 100% faithful recreation of a legend!
« Reply #100 on: September 18, 2017, 02:52:02 AM »
Difference between Hammond Sizes X7 / X8 is only 6,35 mm in length, width and height is the same

Hammond 372x is 82,55 mm
Hammond 370BX is 76,2 mm

Well if that's the case - I'm sure I can make it fit.
Anyway I can make mounting slots instead of just holes for the power transformer, so one could use both - X7 or X8 size ;)



rainton

Re: Universal Audio 176 from scratch - a 100% faithful recreation of a legend!
« Reply #101 on: September 18, 2017, 02:54:01 AM »
Because I get asked this quite frequently - the correct output transformer for the build is the Sowter 1285e (for a 176)

But fear not - I'm working on a BOM - and since preparing everything for a production run takes longer than expected you should all have enough time to order your stuff once we get this thin going ;)


core13

Re: Universal Audio 176 from scratch - a 100% faithful recreation of a legend!
« Reply #102 on: September 20, 2017, 10:32:58 PM »
Is it possible to do a kind of altec 436C mod?

bypassing the interstage tx with a switch and sending the signal from the 6BC8 with caps and resistor to mimic the sound of ALTEC 436C
here the schematic
http://img.photobucket.com/albums/v295/rafoote/Altec%20436C/Altec436C.gif

The Idea came from here
https://www.gearslutz.com/board/high-end/109707-universal-audio-175b.html#post1136249
« Last Edit: September 21, 2017, 07:13:37 PM by core13 »

Phrazemaster

Re: Universal Audio 176 from scratch - a 100% faithful recreation of a legend!
« Reply #103 on: September 21, 2017, 09:09:11 PM »
Is it possible to do a kind of altec 436C mod?

bypassing the interstage tx with a switch and sending the signal from the 6BC8 with caps and resistor to mimic the sound of ALTEC 436C
here the schematic
http://img.photobucket.com/albums/v295/rafoote/Altec%20436C/Altec436C.gif

The Idea came from here
https://www.gearslutz.com/board/high-end/109707-universal-audio-175b.html#post1136249
That might be cool. I think rainton (Martin) is after creating an exact clone - see title of thread "100% faithful recreation."

I'm sure some mods can be done. Maybe a separate thread would be good for that?
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rainton

Re: Universal Audio 176 from scratch - a 100% faithful recreation of a legend!
« Reply #104 on: September 22, 2017, 01:45:36 AM »
That might be cool. I think rainton (Martin) is after creating an exact clone - see title of thread "100% faithful recreation."

I'm sure some mods can be done. Maybe a separate thread would be good for that?

Thanks Phrazemaster - and yes I am after building an exact clone, which I did, but I already started to mod my unit  ;D

I tried to do the mods in a way so I don't need to change the original looks - e.g. by using push-pull pots with switches.
I'll talk about that in a bit.

But I think it would be cool to collect everything 176 related here - also the mods :)

So we'll have everything in one spot

Phrazemaster

Re: Universal Audio 176 from scratch - a 100% faithful recreation of a legend!
« Reply #105 on: September 22, 2017, 02:49:06 AM »
Thanks Phrazemaster - and yes I am after building an exact clone, which I did, but I already started to mod my unit  ;D

I tried to do the mods in a way so I don't need to change the original looks - e.g. by using push-pull pots with switches.
I'll talk about that in a bit.

But I think it would be cool to collect everything 176 related here - also the mods :)

So we'll have everything in one spot
No worries man - it's your thread!

- However -

Having done many projects here that have a gazillion pages to read through, it might be nice to have a dedicated thread for mods vs the original. Your call - I'd rather it be separated so it's clear who's modding and who's just building. It's a real drag to have to read through tons of material that's not related to what you're trying to do.

That's my $.02.

Mike
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core13

Re: Universal Audio 176 from scratch - a 100% faithful recreation of a legend!
« Reply #106 on: September 23, 2017, 08:55:57 AM »
I though about a non invasive and easily removable mod,
like using inside switch or something like that

core13

it can be interesting to add also a hpf on the sidechain.

maybe a 4 position switch instead of a vernier pot.
1 original
2 original hpf
3 Altec
4 Altec hpf

Phrazemaster

Just to set the record straight - did the originals use A18's or A19's for the interstage transformer? I've tried a lot of googling but can't seem to find the answer.

Thanks!

Mike
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dbonin

I'm down for one case and kit and all...  depending on cost, of course.  Such great work - inspiring!
Thanks!


core13

I found to add the sidechain we just need to change value of C6 and C7 with a switch

also what is the Asymmetry mod on the retro 176?