Techtalk

Hello Sorry for the English...

I am looking for German DIYer "Peterbiehl" from the PP DIY forum.
He was selling some microphone head baskets I am interested in. It does not look like he was able to sell them.
Does anyone have any contact with him?

Thanks a lot guys !

Chuck
cdickinson66 (at ...

The Mono unit use a 3/8 amp 250V slo blo
Drip spec'd a 400mA slo blo

I'd say unit a 800 mA slo blo for a stereo unit?
Heck why not just throw in a 1amp slo blo ??



Chuck

What fuse rating are folks using in this unit?
One of mine blew today but I think it was rated too small.
Just a sanity check really.

-Chuck

germanhot,

Yes you can do the M/S this way as well and it would be more transparent . I wanted mine to be transformers because I was integrating it into a stereo 1176 build so I wanted to reuse the Input and Output transformers. I was also thinking of reusing the same design inside the Poorman 660 ...

I am still trying to figure this M/S hookup problem. I think it works but I noticed something strange. If you turn up the amplitude on one side while in the MS matrix it will invert the phase relative to the other. This reaction only happens at certain levels for both. It's hard to explain.

Which ...

Hello

I tried the M/S in my Stereo 1176 since matching was a pain and I could never get both sides equal.

I have a design completed but I am finding that it has phase issues on the output here is my PCB:

http://pillarsofnein.com/diy_projects/1176_revG/Photos/MS_board_new2.png


2 mono mode ...

I tried Gotham cable 3 conductor in my first D-LA2A and was not impressed. I was trying to cut corners buying a nice cable to use ... now I will have to go back are redo the whole thing.

My second D-LA2A is done with OCC copper wire braided by hand then shrink wrapped then a large Solder wick is ...

I think if I can find the time I will rewire my first unit. My "Numero Deux" is sooo quiet while the first onestill has a hum if gain is full at about -65db.

I used some high end Gotham 3 conductor cable instead of my special DIY OCC wire invention on the first one to try it out, the results are ...

Numero deux....

Did this one for my producer here in LA for trade on some slick mix-production on some new tracks. Hey Volker I used those old MAllorys in here but I think they might be not so great. When I fire the unit up ,if the gain is up, it squeals a high pitch noise which goes away in 1/2 a ...

OK Got it down to -75dBu at max Gain !! At 70 it is non-existent!!!
Yeah!

Quote .... "My Photo-love Story"

http://pillarsofnein.com/diy_projects/LA2A_Stereo/Photos/chuck_stla2a1.jpg
http://pillarsofnein.com/diy_projects/LA2A_Stereo/Photos/chuck_stla2a_b2.jpg
http://pillarsofnein.com/diy ...

Yes you are correct

I just spoke with a friend and very popular old school amp builder (founder of SUNN amplifiers). Conrad Sundholm.

He told me that for his stuff he always star grounds all of his ground planes to Pin 1 of the Input XLR then he connects the pin one to chassis. Now he also ...

He Bernd,

in one photo you have listed a Transformer Ground . Is that the power transformer? in the other photo there is no real trasformer earth ground connection.

Is there any real need to have our star ground connected to earth ground?

Someone here at work mentioned that is where the 60Hz ...

Great! thanks! those photos will be a big help!


Any others?

-Chuck

Yup it's me !

Ok so Volker used :

Gain / Peak : Standard two conductor wire with shield connected at both ends (board and pot) as pin 1. Since Pin 1 is ground on board.

Limit/Comp : twisted pair with no shield


Anyone else?

- Chuck

Ok I think I found a big problem Bernd gave me a hint when he said his hum went away when he screwed the pot to the front panel.

One problem was the cables need really really good shielding. I used some nice shielded cable but still if I just move a cable bend an end the noise jumps from -60dBu to ...