Finally got my hybrid Pultec done...

[jrmintz]

Hi All,

It's taken a while, but I finally finished my Pultec. Here's some pix (they're very large):

Picture 1
Picture 2
Picture 3


Special thanks to NYDave for general guidance, Jakob for his design, which I didn't use but which I studied long and hard, Winston O'Boogie for help with transformers and parts, and extra special thanks to Cayacosta for sharing his wiring diagram. If it wasn't for that diagram I'd still be staring at the schematic and scratching my head.

:guinness: :sam:

 

[tk@halmi]

Neat! What kind of inductor did you use?

 

[MikoKensington]

Nice stuff, Seth. You beat me. But I have a pair coming along nicely. Is that the Sowter inductor?

Way to go. One down, eh? :wink:

 

[NewYorkDave]

Polypropylenes from Mouser?

I recognize those 'cause I bought the same for my own EQ project, which I hope to build sometime before the end of the decade. They are big fuckers, aren't they?

I was really pumped when I first glanced at the third photo, 'cause I thought I saw DYMO labels! Whoops... my mistake. They're Brother.

Nice work, Seth.

 

[dukasound]

Great :thumb: Seth :thumb:
I have no courage (read: :sad: and money :sad: ) to start original because its hard (and expencive) to find all of transformers, inductors and swirches.
I am in progress with mine Gyraf Pultec.
need some parts and chassis.
Duka

 

[cayocosta]

Excellent Seth.

 

[jrmintz]

Thanks, guys. I had a bad moment until I realized I'd wired the bypass switch backwards. Oops...

Sowter inductor and polypropylenes from Digi-Key, actually. They had all the values. I go back and forth about the Brother labels - the gear works fine. I'd love nice face plates, but I have a hard time with the idea of spending more money and effort purely on front panels. I'm definitely keeping an eye on the DIY engraving machine project.

:thumb: :thumb:

 

[Flatpicker]

Very cool Seth! BTW, what did you do different (besides the obvious API gain make-up)?

 

[tommytones]

I don't see any fuse on the AC .... :?

Very nice job though. Where'd you get those pc boards for the pots??

 

[NewYorkDave]

Ouch!

Don't put that drill away just yet, Seth :wink:

 

[tommytones]

Never mind. I just zoomed in and saw :green: (the pcb's that is)

 

[jrmintz]

I like to live on the edge, but not where fuses are concerned - it's in the IEC connector. The terminal board came out of an old Tek instrumentation preamp. It just happened to be exactly the right size. Aside from the API card it's exactly the Pultec in the schematics in the Meta, with a Jensen JT-11SSP6M 1:1 input transformer I got from Winston O'Boogie. He was kind enough to throw in the pots and boards.

:thumb: :thumb:

 

[nrgrecording]

Very cool Seth!

:thumb: :thumb: :thumb:

...I love these frequency knobs! :green: thx!

 

[jrmintz]

I was just doing some listening on a mono track - wow does this thing have some bottom! It's definitely going to add some interesting bass/bass drum possibilities. It's always nice when you finish something and not only does it work, but it actually sounds good. Hmmm....now where in my racks am I going to put it?

:thumb: :green: :sam: :guinness:

 

[matthias]

yes really very nice !!!

just waiting for franks upcoming pultec(s)


is there any reaosn why you have choosen exactly that type of capacitors ??


mat

 

[Ethan]

Niiiiice! Congrats Seth.
Now go make some moooozique

 

[jrmintz]

is there any reaosn why you have choosen exactly that type of capacitors ??

It was the only family of polypropylenes where I could find all of the values. I looked at a bunch of different esoteric types but I couldn't find all of the values in one product line, and I didn't want to mix and match. I don't know if mixing caps would have been audible, but I didn't want to start with mixed caps.

 

[radiance]

Very nice Seth!
Did you play any music thru it yet?

 

[kpeek]

How did you set up the API card?

 

[jrmintz]

Did you play any music thru it yet?

Yes - it has Pultec bottom, that's for sure. I need to listen to the top end a bit more on some other music. I don't quite get it yet.

How did you set up the API card?

An 11k resistor between pins 7+8 for roughly 20dB of fixed gain.

:thumb: :thumb: