Whoops

Re: Helios thread
« Reply #240 on: December 15, 2016, 08:52:59 AM »
Those look like Lustraphone transformers, nice.

I can't see what cards are fitted on the mic amplifier. Can you take some pictures of the cards at the top?


Re: Helios thread
« Reply #241 on: December 15, 2016, 10:12:40 AM »
Well if you know a source for more modules and dont want them all for yourself please let me know, I would buy a few.

Thanks

I am not sure if the modules are for sale but a copy of the manual would be nice...


Those look like Lustraphone transformers, nice.

I can't see what cards are fitted on the mic amplifier. Can you take some pictures of the cards at the top?

There is no any text on the trannies and Lustraphones are new to me so I cannot say anything about them.
I can try to measure them also if it reveals something.

I will take more and better pics soon!

Edit. Pics of the PCBs added https://drive.google.com/drive/folders/0B53QfYJWE3UVUUczOFo4bGxfSm8

"line amp" is a line amp for sure and "5252" seems to be a level meter circuit which drives an LED.  "5349" is the first PCB in the signal path and "5054" has two identical circuits on it.
« Last Edit: December 15, 2016, 12:08:27 PM by J0hanne5 »

Whoops

Re: Helios thread
« Reply #242 on: December 15, 2016, 01:03:43 PM »
I searched my Helios docs,
I don't find any info, pics, or schematics of the 5359, 5054.

I have the schematics for the 22113 that are posted in this thread.

As for the Lustraphone transformers those are the most regarded transformers that Helios used.
you can see this pictures of the original Lustraphone transformer






Re: Helios thread
« Reply #243 on: March 06, 2017, 12:03:17 PM »
I've put together a mostly point-to-point version of the Helios eq, based on Ruff Record's schematic. Make up gain is via CAPI-Gear's 2-stage booster board, basically one 2520 as a receiver and another as a booster amp. Since I took the photo I've installed 990's in place of the GAR2520's. There's a Cinemag CMOB-2S, 1:1 transformer on the output.

Has anyone found that the lowest frequencies of the mid range boost have a very broad Q? I noticed that in RuffRecord's documentation also, but it seems a bit exaggerated in mine.


Re: Helios thread
« Reply #244 on: March 06, 2017, 12:06:12 PM »
Here's a cheapo screenshot (iphone photo...) of the mid range curves:


ruffrecords

Re: Helios thread
« Reply #245 on: March 07, 2017, 11:00:26 AM »
Just because they look broader at lower frequencies does not necessarily mean the Q is lower. The frequency scale is logarithmic  so the low frequencies spread out s lot more. Try measuring the Q from the curves.

Cheers

Ian
www.customtubeconsoles.com
https://mark3vtm.blogspot.co.uk/
www.eztubemixer.blogspot.co.uk


'The only people not making mistakes are the people doing nothing'


 

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