Golden Age Pre 73 Capacitors
Old 14th February 2013
  #1
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Golden Age Pre 73 Capacitors

Hello everyone,

I've owned the Pre 73 for a while now. I also have a pair of AMS 1073's as well as 1084's. The main difference I hear between the AMS stuff and the GAP are

1. Around the 200hz range on the GAP it sounds somewhat scooped, thin and less punchy.

2. The high end is a bit gritty on the GAP and I'm guessing this is due to the cheap caps.

Allot of you would ask why I would even want to mod my GAP? Well it's something I've really gotten into lately. I want to start building some DIY kits from drip etc... So I figured the GAP should be a fun place to start.

What caps does ZenPro use on their mods? I know its probably 22uf Tantalums but I'm not sure what voltage I should get. If anyone has a link to order these please post!

Aaron
Old 14th February 2013
  #2
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cuebism's Avatar
Quote:
Originally Posted by Aaron Rash View Post
Hello everyone,

I've owned the Pre 73 for a while now. I also have a pair of AMS 1073's as well as 1084's. The main difference I hear between the AMS stuff and the GAP are

1. Around the 200hz range on the GAP it sounds somewhat scooped, thin and less punchy.

2. The high end is a bit gritty on the GAP and I'm guessing this is due to the cheap caps.

Allot of you would ask why I would even want to mod my GAP? Well it's something I've really gotten into lately. I want to start building some DIY kits from drip etc... So I figured the GAP should be a fun place to start.

What caps does ZenPro use on their mods? I know its probably 22uf Tantalums but I'm not sure what voltage I should get. If anyone has a link to order these please post!

Aaron
When replacing capacitors, get at least the same voltage rating or even one higher (ie from 50v --> 63v).
Quote
1
Old 14th February 2013
  #3
Gear interested
 

Here is a BOM from EZ1290!
You can start from here!For block caps you need polystyrene caps!
And change the trafos for Carnhill's....


Cheers
Old 14th February 2013
  #4
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Old 14th February 2013
  #5
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Aaron Rash's Avatar
 

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Awesome! So it appears the caps ZenPro replaces on their Pre 73's are 22uf 16V tantalum caps. I'll start there!
Old 14th February 2013
  #6
Gear interested
 

This BOM is from Madrianse EZ1290!
22uf 16V and 10uf 25V are Tantalum caps!


Cheers
Old 14th February 2013
  #7
Gear interested
 

And trannies are very important...

For EZ1290 i use Carnhill trannies...


Cheers...
Old 14th February 2013
  #8
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Aaron Rash's Avatar
 

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Now I just need to find out where to put them on the GAP now. The circuit is different then the AMS1073
Old 14th February 2013
  #9
Gear nut
 

Hey you might wanna check this out,
Golden Age Pre73 Preamp Mods

also that site is a great resource for more DIY projects!

I have ZenPro modded Pre-73 myself(full mod-caps and trannies) and I LOVE it.

Good luck with your mod!
Old 14th February 2013
  #10
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Ive got a couple of gaps with tant caps. Leave them as is - if your going DIY - this HAS to be your next project Audio Maintenance Limited Kits - EZ1073 - full kit with transformers, inductors (all Carnhill) PCB - everthing bar the enclosure for $350ish. I think its the best deal around and the build guide id first rate.
Old 14th February 2013
  #11
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Labs's Avatar
 

I doubt replacing the caps will make much of a difference - but thats just me. The trafo will have a much bigger impact.

Colins EZ1073 is awesome.

Gustav
_______
Build your own gear
Old 14th February 2013
  #12
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Aaron Rash's Avatar
 

Thread Starter
I will be changing the transformers as well. I'm gonna try to find some vintage marinair/stives 10468 mic input trannys. I think the caps will clean the high end out though
Old 14th February 2013
  #13
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Quote:
Originally Posted by dogma View Post
Ive got a couple of gaps with tant caps. Leave them as is - if your going DIY - this HAS to be your next project Audio Maintenance Limited Kits - EZ1073 - full kit with transformers, inductors (all Carnhill) PCB - everthing bar the enclosure for $350ish. I think its the best deal around and the build guide id first rate.
This translates to about $560 USD. Still a reasonable price.
Old 14th February 2013
  #14
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No I realise the price is diffeent. I didnlt do the conversation or metioned it was in pounds. But $550 for a FULL 1073 channel pre and eq and the same trafo's in/out and inductors AMS Neve use. Its rediulous really - and they look dead on to with the cases and knobs. Come out to $1200 for the sweetest front end. Plus you time of course. But you learn all this stuff and you realise you can build anything (including synths - Im doing a shruthi-1 at the moment). Sorry for slightly derailing the thread. BUt save them trafo's for a better circuit!!! Or sell them to me
Old 14th February 2013
  #15
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The build looks extremely easy. I wonder how these things compare in sound to the actual Neve AMS units. $550 per 1073 channel complete with Pre/EQ is a great price.
Old 15th February 2013
  #16
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Yup and thats for everything - best tant caps, Panasonic, vishay,,ect. I;d say it would sound 'better" in regards to the simple fact better components re used. Cant remeber which re-issue but someone over at prodigy opened the 2254c I think and found SMT very where. The key is the circuit, followed by components. I'm going to do a pair as soon as funds allow. Edit: except the metal work. Cases are about $150
Old 8th January 2014
  #17
Gear interested
 

any australians know anyone who does this?
Old 8th January 2014
  #18
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Aaron Rash's Avatar
 

Thread Starter
I ended up building several 1073's now. Back when I posted this I knew nothing of electronics.

If you tell me what you're trying to do I can tell you what components you need to change.

Aaron
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