APP Studio Ing's products - APP992 - APP14GE Germanium DOA and other kits

[ppa]

I'll take 2 Germ preamps. M

PM sent
thanks
kind regards

 

[okgb]

the germ pre looks exciting  , I've been meaning to order a couple of your germ opamps
so looks like I'll have to put an order together

 

[ppa]

the germ pre looks exciting  , I've been meaning to order a couple of your germ opamps
so looks like I'll have to put an order together

many thanks for comments,

sorry, but regarding the APP2050GE , even if they had success, I have put them out of production from a while because they needed too hard work.

kind regards

 

[ppa]

since I have only some pcs, I would want to say that, to avoid misunderstandings, priority is given with payment.

kind regards

 

[ppa]

all preamp kits sold

I am waiting for new stock.

 

[Kingston]

I did some DOA comparisons. I have several different types of ppa opamps so I thought other people here might be interested.

http://www.groupdiy.com/index.php?topic=27972.msg618444#msg618444

The new APP992 opamp is amazing. Someone building mastering gear should perhaps check it out.

 

[Winetree]

Pier,
Received the Kits and CAPI parts. Waiting for 2nd package.
Please send Docs.
Check your E-mail and clear PM box.

 

[ppa]

I did some DOA comparisons. I have several different types of ppa opamps so I thought other people here might be interested.

http://www.groupdiy.com/index.php?topic=27972.msg618444#msg618444

The new APP992 opamp is amazing. Someone building mastering gear should perhaps check it out.

thanks very much for your comments,

 

[ppa]

Pier,
Received the Kits and CAPI parts. Waiting for 2nd package.
Please send Docs.
Check your E-mail and clear PM box.

I have sent the docs to your email

kind regards

 

[Winetree]

PM sent

 

[Winetree]

What value is R8?
Not listed in MA1 BOM.

 

[ppa]

What value is R8?
Not listed in MA1 BOM.

sorry for the value missed in the BOM , R8 is 10k , 1/4W, 1%, metal film (however it can be 5% carbon film for who loves the old carbon film resistors' sound)

PM with the new BOM sent

 

[kilmister]

Hi Pier.

Sent you mail few days ago, haven't recive answer yet. Have you got my mail?

Cheers,
Paavo

 

[Dr Gris]

[/quote]

thanks for your comments,
yes, app992 is very similar to app2065, the app2065 has bipolar transistors in the front end, so it uses the same 992 PCB.   
Now, I have developed another opamp called app2060 that's a FET input opamp
[/quote]

I' m sorry, I' m a bit confused about all your DOA´s right now. Is the APP992 the only one in stock at the moment?
I would like to buy two opamps for my upcomming build: http://www.groupdiy.com/index.php?topic=46920.0
Do you think these will fit this application? In the build thread they say I might need a feedback cap if it has high DC offset (in this case a JLM99V opamp), what do you think?

Kind regards
Magnus

 

[ppa]

thanks for your comments,
yes, app992 is very similar to app2065, the app2065 has bipolar transistors in the front end, so it uses the same 992 PCB.   
Now, I have developed another opamp called app2060 that's a FET input opamp

I' m sorry, I' m a bit confused about all your DOA´s right now. Is the APP992 the only one in stock at the moment?
I would like to buy two opamps for my upcomming build: http://www.groupdiy.com/index.php?topic=46920.0
Do you think these will fit this application? In the build thread they say I might need a feedback cap if it has high DC offset (in this case a JLM99V opamp), what do you think?

Kind regards
Magnus

thanks for the question.
APP992 is the only opamp I have stocked at this time.
APP992 is a very good opamp for many eqs for its high slew rate of 75V/uS and its very high BW
and for its very high stability.

Mitsos has just PM me,
Yes, I think APP992 runs on Mitsos's eq without any mod. If you decide to buy it from me and If it doesn't run in the Mitsos's eq I will refund you the money for the 992's you will buy from me.  .


kind regards
Pier Paolo

 

[Dr Gris]

Hi Pier,

thank you very much for your great offering. That is very kind of you!!
Since I' ve read so much good things about your opamps I really want to buy two APP992' s from you.
Even if I would have to mod the EQ circuit it wouldn' t be too much hassle.
All of your earlier opamps have caught my attention for a while so this new APP992 seems very exciting!!
I will contact you by PM or mail or you can email me if you' d like.

Sinceramente
Magnus

 

[ppa]

a photo of MA1 mic preamp with new PCB.

 

[okgb]

Will the preamp be available as a kit ? and will you post when the germanium opamps
are back in stock ?

 

[ppa]

Will the preamp be available as a kit ? and will you post when the germanium opamps
are back in stock ?

yes, I will sell the preamp as a kit and mounted.
I am waiting some components to make the kits.
The kit is a partial kit and it will have all components except the trasformers and the switches.

Yes, I will post when the new germanium DOA will be ready to sale.

 

[Rellister]

Hi Pier,
some questions about your APP PSU - (maybe it should be posted elsewhere?)

I´m learning by doing, so sorry for newbie questions.
Is a 30VA 2x18V enough for powering 4x312-style pres running at 16V, in addition to 48V?
I don´t understand how the PSU makes +48V from this toroid- but I can see that theres no input for a +48V secondary.
LM317 is only specced to about +37V. Will it be able to handle +48V?
I also want to pretrim the trimmers so I´m not that far off when powering up, but I cant seem to calculate the right values - since LM317 needs more than 10K to make 48V when R6 is 332ohm according to schematic.

Thanks
Rune