JLM AUDIO

Hello from France ,
I hope you are all safe and well!!

so I found a couple of other threads on the subject, but as I'm ashamed to admit, I went way over my head to build a passive pultec (ahhh DI and ssl were so easy)

sorry if my english is not so good.

I wanted to build a passive pultec a long time ago and and life caught me...chils, work etc...but I want to finish!!.
- I already wired the eq network, not very difficult (caps and inductor)
- I'm stuck as I want now to add the dingo as input/output
- add a transformer to the dingo

my questions:
- I'm not sure where I need to connect the dingo JLMIO to the eq network?
"in" to treeble boost, "out" to 1k resistor on the low switch?
- I have 2 output transformers: Carnhill BTB 9049 and an utc a-20, which one will be better for this?
wich ratio should I use? or maybe I should leave the tx for now?

As you can see I'm lost, but I really want to finish this, I can feel I'm close to the end.
thanks in advance for your help

Cedric.

HI cedric can you post or attach a picture of the passive eq schematic you are using so I can draw thew answers to your questions on it.

Hi Joe,

first thanks for answering

- I used, if I recall well the Gyraf one for all the network including bypass.
http://www.gyraf.dk/gy_pd/pultec/pultech.gif

and to answer my own question regarding TX I'll use the UTC, makes more sense regarding the sound.
is 1:2 (200:500) ok?

thanks again.
Cedric.

jreakee wrote: ↑

Tue May 19, 2020 5:24 pm

Hi Joe,

first thanks for answering

- I used, if I recall well the Gyraf one for all the network including bypass.
http://www.gyraf.dk/gy_pd/pultec/pultech.gif

and to answer my own question regarding TX I'll use the UTC, makes more sense regarding the sound.
is 1:2 (200:500) ok?

thanks again.
Cedric.

See attached for dingo wiring.
Either transformer wired as 1:1 to 1:2 will work fine. 1:1.6 to 1:2 is preferred

Thank you very much Joe!