Just built an LA-4. Anyone got an original one I can compare with??

[Terby]

Lune Tune,

Look at http://www.jblproservice.com/pdf/Vintage%20JBL-UREI%20Electronics/UREI-LA-4%20manual.pdf, instructions start on (PDF) page 26.

  Andreas

 

[Luny Tune]

Thanks, I got that one. It's about meter adjustment and stereo tracking. I need one for adjusting the ratio and threshold trimmer in a "virgin" unit.

Thanks! I appreciate your effort!

 

[Terby]

I guess you can set them centered (at least the threshold trimmer), that's how I set the "stereo-adjust" trim in my LA3-A clone.

For the ratio trim I would compare input/output voltage (dbm) with the front panel ratio setting and try to adjust the trimmer accordingly.

  Andreas

 

[Luny Tune]

Yes, I see your point, but the ratio trimmer, to me, does more than set the correct ratio.

 

[Kir_For_Pleasure]

Cool project ! im in for a couple of boards if you are about to sell any.
Opto regerar ! he he he

 

[Luny Tune]

I'll advertise!

Nemlig! Opto styrer!

 

[zachs]

Any update on this?

 

[Luny Tune]

Yes, I'm almost done. I'm talking to the PCB guy today about making boards and within a few days I'll have a complete BOM, a PDF file with layout and "stuff"...

I'm having an "LA-4 diy day" here on the 22nd of january and I'm busy setting all that up.

 

[W DeMarco]

Allright,  Nice project.  I have a pair of silver la4s and absolutley love them.  Great work guys!!

 

[Luny Tune]

The boards will be here in under two weeks and I'll have about 35-40 boards for sale of this first batch.

I'll post in the Black Market. Keep an eye out there!

(Danish diy'ers can order through groupdiy.dk)

All in about  one and a half week. I'll need to do a bit of quality assurance before selling them too.

 

[okgb]

I can assure you I'll buy a pair

 

[3nity]

whats the cost of parts no case.

 

[zachs]

Can't wait!

 

[Luny Tune]

I've sourced parts for one LA-4 and that was $164/€127.
That's including the board itself.

And I've laid it out so that it's very easy and simple to connect the supply on one board to another so adding another board for a dual version makes the second one cheaper. Adding an extra board only adds $116/€89.

I can't really say until the invoice gets here but I believe the boards will be $20/€15 including shipping.

I'll soon have a pdf document uploaded for the project.

 

[Luny Tune]

The boards have arrived. I'll make a thread in the Black Market when I've calculated the final price + shipping.

 

[MartyMart]

Nice one guys, I'm in for a pair Luny - Weird that I was looking up a good "otpo comp" to
do last night, was thinking of the What or Joe Meek  !!

MM.

 

[MrZpliff]

Nice work 

Would love to see the pdf.

i'm in for a board too.. maybe two.

 

[ilfungo]

Help!
how to connect VTL5C4 / 2?
I made several tests but I can not make it work..... :'(

 

[Luny Tune]

I just replied in the help thread where the question belongs.