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'

Squeaky

Re: Helios thread
« Reply #246 on: June 10, 2019, 10:41:32 PM »
I know there has been some interest about Helios consoles and output transformers and whether they were ever used or not (interest in the very least from me). There are currently some Sowter output transformers for sale and the sales blurbs include some interesting photos and comments. The transformers were apparently used in a small Helios console (special order in 1976). Furthermore, these same (or similar?) type of Sowter transformers were also apparently used in a couple of large format recording consoles.

Whoops

Re: Helios thread
« Reply #247 on: June 11, 2019, 09:05:44 AM »
There are currently some Sowter output transformers for sale and the sales blurbs include some interesting photos and comments. The transformers were apparently used in a small Helios console (special order in 1976). Furthermore, these same (or similar?) type of Sowter transformers were also apparently used in a couple of large format recording consoles.

Do you have links?

I have yet to see any Helios schematic, or photo with an output transformer.
Even if there's a particular model that had output transformers the original ones would not be Sowter for sure.


ruffrecords

Re: Helios thread
« Reply #248 on: June 11, 2019, 10:46:36 AM »
Do you have links?

I have yet to see any Helios schematic, or photo with an output transformer.
Even if there's a particular model that had output transformers the original ones would not be Sowter for sure.

I have definitely seen photos of Helios consoles showing output transformers but I agree they are unlikely to have been Sowter ones.

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'

ruffrecords

Re: Helios thread
« Reply #249 on: June 11, 2019, 11:03:58 AM »
Check out this video at 1:05

https://www.youtube.com/watch?v=k28PCcB2rG4

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'



Squeaky

Re: Helios thread
« Reply #251 on: June 11, 2019, 03:38:32 PM »

ruffrecords

Re: Helios thread
« Reply #252 on: June 11, 2019, 04:59:51 PM »
There is a serious amount of hype surrounding  those ads and the prices are ridiculous when you consider you can get a brand new Carnhill for £25.

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'

Rob Flinn

Re: Helios thread
« Reply #253 on: June 11, 2019, 05:38:08 PM »
Why don't you email Brian Sowter and ask him if those model numbers were made for Helios ?
regards Rob

Squeaky

Re: Helios thread
« Reply #254 on: June 12, 2019, 04:12:10 AM »
From my perspective, I was mainly interested in the information (if it were true) that accompanied the advertisements. Gleaning becomes a pass-time.

Whoops

Re: Helios thread
« Reply #255 on: June 13, 2019, 08:34:36 PM »
Thank you so much for the video Ian, and thank Squeaky for the links.

I really don't think any of those transformers have anything to do with Helios or Helios consoles.
Those were probably post-installation transformers that clients asked to be installed to have balanced outputs.

All of those are externally mounted, and don't feel like they were part of any original console.
Neither were any of them made for Helios specifically. They are balancing transformers that a contractor "Benum" ordered for their custom installation.

Some clients, like broadcast companies felt the need for Balanced outputs and they would contract a  post-installation of balancing output transformers, that would be mounted on the patchbay, the back of the console or wherever it was practical.

I never seen an Helios Schematic with an output transformer, neither I have ever seen an Helios console picture with factory installed output transformers.
Maybe there is, but I still have to see one

« Last Edit: June 13, 2019, 08:41:08 PM by Whoops »

Re: Helios thread
« Reply #256 on: October 07, 2019, 03:46:27 AM »
Hi,

I'm wondering if anyone might be able to help out with information about some modules from an old radio console.  The forum software won't let me attach a photo, but there are some pix here:

www.themorningpeople.com/helios/

They're being restored and racked at the moment but I am struggling to piece together their history because they were not part of a Helios console. They were actually built into a mixer by Tweed Audio that was installed at Capital Radio in London. What seems to have happened is that Helios were in the middle of a big job for Capital when they went out of business, and after this happened, the Capital engineers went to the Helios factory and took away a lot of parts, presumably including these modules.

I've talked to Cyril Jones and a couple of ex-Helios engineers and none of them has a clear memory of these modules, even though they are unusual. Were they originally intended for Capital, or for some other job? Why do they have a compressor built in when no other Helios channels do? Does anyone have any schematics that might be relevant to these? They are the later style with active rather than inductor-based EQ, and the compressor uses a dBx 202 VCA.

Re: Helios thread
« Reply #257 on: October 07, 2019, 08:56:53 AM »
When Dave Amels was helping restore and modify Lenny Kravitz's Helios desk and external modules, he added a push-pull transistor buffer to the outputs so a transformer and lower load could be driven comfortably.
On pretty much all the Helios amp stages I've seen, I think this is necessary.

Re: Helios thread
« Reply #258 on: October 07, 2019, 09:06:41 AM »
Neat looking modules and story Snigglepit 👍

I think the issue may be the pics are a bit too large to upload, gives us more resolution to zoom in though so thanks 😊

Whoops

Re: Helios thread
« Reply #259 on: October 07, 2019, 11:54:47 PM »
he added a push-pull transistor buffer to the outputs so a transformer and lower load could be driven comfortably.
On pretty much all the Helios amp stages I've seen, I think this is necessary.

Do you have idea of what circuit was that?
Any schematic available for that circuit?

thank you so much


 

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