TillM

I made a short Demo with the APP14GE with AF127 transistor and the APP992.
No Processing.
Enjoy.

1. APP14GE
https://www.dropbox.com/s/uztd4kr5c0knzo5/APP14GE%20127AF.wav

2. APP992
https://www.dropbox.com/s/q28qnrv5g84i68r/APP992.wav


Potato Cakes

Pier,

I finally got the knobs on it and was able to start messing around with it. This thing sounds fantastic! I tested them with program material and it behaves like high end mastering EQ’s in regards to the high and mid bands. Boosting some 4k gives that more forward feel to the entire track without the harsh graininess that is associated with cheap equalizers. I know this is all subjective “gear-head” talk, but since I do mostly mixing, I just plug things in and see how they sound. After all, that is ultimately what matters in my world. I am using these with the recommended APP 992/14GE combination.

The knobs I got are a bit on the cheap side. I had to drill the cavity deeper to accommodate for the switches, so now they don’t sit perfectly in place, but they do the job.

I do need to replace the LEDs. The ones I had that were the correct size were white, and even with adding resistors they are still too bright. I just need to find a low output green or red and I should be good.

Anyway, very awesome EQ. Looking forward to what you have coming out next.

Thanks!

Paul

ppa

many thanks for your comments on my new eq APP540.
I have just available the PCB's , BOM, schematic and .dxf and fpd files.

Pier Paolo


jensenmann

Hi group
I just wanted to give some feedback to Pier about his APP992 in my Sontec 250 clone from donclassics.com.
My background is that I do maintenance work in quite some studios, a bunch of mastering studios included, in my area. The latter ones all equipped with one or two Sontec EQs. From my first experience with a real Sontec on I was hooked on these. I consider them to be amongst the very finest EQs ever, if not the best at all (whatever best means...). So when Igors 8 channel kit became available I built them using 2604 opamps throughout. The first comparison the the real 250 was disappointing. While Igor´s kit is a fine EQ it has a totally different tonality and the HF band, which he unfortunately modified, couldn´t hold a candle compared to the original. In itself it´s a nice and versatile EQ, better than many if not most others. But still far away from  the real deal.
Later on when the Donclassic came out I made one of these for myself. First I´ve been using OPA132 at the input/summing position for money and convenience reasons but it quickly turned out that it didn´t have the headroom a real Sontec has, as well as it didn´t sound like a real Sontec. The HF band sounds a lot closer to the original than Igor´s version, though. That gave me hope at least and I changed the OPA chips to APP992 DOAs running on +-24V. That solved the headroom problem and the tonality came a lot closer to the original 250 boxtone, closer than any other version before. It still isn´t exactly the same, but I haven´t heard anything better yet.

So there you have it, my opinion at least. Give the APP992 DOA a try in your Sontec builds.
Jens
Quote from: PRR
The tubes of course don't care what frequency they distort

Potato Cakes

I second this DOA for high end EQ applications. I am using APP992 in my DR MQ-5 and it sounds fantastic.

Thanks!

Paul

kante1603

I have them on my Igor F76 on output,was a great improvement too.


Best,


Udo.

Re: APP Studio Ing's products - APP14GE germanium DOA - APP992 FET input DOA
« Reply #867 on: September 09, 2017, 09:10:07 PM »
Has anyone tried the APP14GE opamps in their Sontec style builds?
I have the APP992's currently, but was interested for fun in what difference the  APP14GE  might give.

TillM

Re: APP Studio Ing's products - APP14GE germanium DOA - APP992 FET input DOA
« Reply #868 on: October 19, 2017, 04:20:56 PM »
any news about the MA1 ?
Will they get back in stock?

yoons

Re: APP Studio Ing's products - APP14GE germanium DOA - APP992 FET input DOA
« Reply #869 on: October 27, 2017, 06:04:19 AM »
any news about the MA1 ?
Will they get back in stock?

If it happen, I would be in for 2 kits ;)


ppa

Re: APP Studio Ing's products - APP14GE germanium DOA - APP992 FET input DOA
« Reply #870 on: October 28, 2017, 07:39:42 PM »
Hi, I am developing the new chassis, I hope to finish it very soon.
Pier Paolo

TillM

Re: APP Studio Ing's products - APP14GE germanium DOA - APP992 FET input DOA
« Reply #871 on: October 29, 2017, 04:00:45 AM »
Do you have to do it completely new? I hoped frank will fix it for you.

btw: I'm in for three
« Last Edit: October 30, 2017, 05:34:11 AM by TillM »

TwentyTrees

Re: APP Studio Ing's products - APP14GE germanium DOA - APP992 FET input DOA
« Reply #872 on: November 08, 2017, 03:09:53 AM »
I'm also in for a pair of MA1s when you get them back in stock!

rackmonkey

Re: APP Studio Ing's products - APP14GE germanium DOA - APP992 FET input DOA
« Reply #873 on: February 15, 2018, 04:35:05 PM »
Please put me down for 2 MA1s when back in stock as well.

Thanks,

Bryan
Whether you think you can or you think you can't, you're probably right.

DjaiTeam

Re: APP Studio Ing's products - APP14GE germanium DOA - APP992 FET input DOA
« Reply #874 on: February 18, 2018, 05:01:04 PM »
Hi, great work here.
I'm also in for one MA1 kit.

ppa

Re: APP Studio Ing's products - APP14GE germanium DOA - APP992 FET input DOA
« Reply #875 on: February 18, 2018, 08:47:26 PM »
Hi All,

the new chassis has been fixed and it's ready to be used.
Actually I am not able to accept orders but I hope to be ready to handle them soon.
I have put you down for these kits. 
BTW is fine posting  orders here and PM or email me for my better organization.
thanks

Pier Paolo
     

Re: APP Studio Ing's products - APP14GE germanium DOA - APP992 FET input DOA
« Reply #876 on: February 26, 2018, 08:38:04 AM »
Pier Paolo, sent you an email at end of January, still being waiting for a reply (and I'm italian so not so far!). Let me know. Thanks!

Are the APP992 dip8 versions still available?

ppa

Are the APP992 dip8 versions still available?

Actually it isn't available since I am waiting the new stock of PCB's,
I will keep you posted.
thanks
best regards
Pier Paolo

Actually it isn't available since I am waiting the new stock of PCB's,
I will keep you posted.
thanks
best regards
Pier Paolo

Great. Thanks.