OPTRO 740 comp / EQ doc's / schemo's ? (WANTED)

An audio community like no other.

Moderators: rick, Mark Bassett

Re: OPTRO 740 comp / EQ doc's / schemo's ? (WANTED)

Postby Paul Maybury » Thu Oct 22, 2015 2:54 pm

I've often thought about getting some t shirts done with the logo seen here;
http://www.oneillassociates.com.au/~pon ... alogue.pdf
Anyone have any ideas about how to that?
Cheers, Paul
Paul Maybury
Frequent Contributor
Frequent Contributor
 
Posts: 669
Joined: Tue Nov 17, 2009 3:07 pm
Location: Melbourne

Re: OPTRO 740 comp / EQ doc's / schemo's ? (WANTED)

Postby The Tasmanian » Thu Oct 22, 2015 3:07 pm

Lets all pitch in for a one off TShirt for Rick for Christmas.
He can wear it under his flack jacket.
C h r i z t o w n o
The Tasmanian
Valued Contributor
Valued Contributor
 
Posts: 1877
Joined: Thu Nov 27, 2008 8:04 am
Location: Deep in the woods....

Re: OPTRO 740 comp / EQ doc's / schemo's ? (WANTED)

Postby The Tasmanian » Thu Oct 22, 2015 3:12 pm

WOW!
Paul - that tape machine catalog pic has a 3 inch 24 track!!!!
C h r i z t o w n o
The Tasmanian
Valued Contributor
Valued Contributor
 
Posts: 1877
Joined: Thu Nov 27, 2008 8:04 am
Location: Deep in the woods....

Re: OPTRO 740 comp / EQ doc's / schemo's ? (WANTED)

Postby Paul Maybury » Thu Oct 22, 2015 3:40 pm

http://dastshirtautomat.com/#home
These folk could do it, and their local to me.
Paul Maybury
Frequent Contributor
Frequent Contributor
 
Posts: 669
Joined: Tue Nov 17, 2009 3:07 pm
Location: Melbourne

Re: OPTRO 740 comp / EQ doc's / schemo's ? (WANTED)

Postby Chris H » Thu Oct 22, 2015 3:42 pm

hell yes! I'm up for an Optro T shirt or three......... I'd even buy one for Rick ! ha ha!! :ar!
Chris Hallam.
https://soundcloud.com/hallamsound
Whatever floats your boat.
User avatar
Chris H
Forum Veteran
Forum Veteran
 
Posts: 2261
Joined: Mon May 09, 2005 11:20 am
Location: Off The Planet

Re: OPTRO 740 comp / EQ doc's / schemo's ? (WANTED)

Postby Paul Maybury » Thu Oct 22, 2015 4:17 pm

The first price break is at 5 units. Anyone else?
Paul Maybury
Frequent Contributor
Frequent Contributor
 
Posts: 669
Joined: Tue Nov 17, 2009 3:07 pm
Location: Melbourne

Re: OPTRO 740 comp / EQ doc's / schemo's ? (WANTED)

Postby The Tasmanian » Thu Oct 22, 2015 7:25 pm

OK - I'm in,
even just to wear it near a mastering facility in Leichardt,
- or wherever the old Festival techs hang out!
C h r i z t o w n o
The Tasmanian
Valued Contributor
Valued Contributor
 
Posts: 1877
Joined: Thu Nov 27, 2008 8:04 am
Location: Deep in the woods....

Re: OPTRO 740 comp / EQ doc's / schemo's ? (WANTED)

Postby Chris H » Thu Oct 22, 2015 8:41 pm

Here are the pics of the inductors. The board is under the other circuit board.
...... :( double post somehow?
Last edited by Chris H on Thu Oct 22, 2015 8:57 pm, edited 1 time in total.
Chris Hallam.
https://soundcloud.com/hallamsound
Whatever floats your boat.
User avatar
Chris H
Forum Veteran
Forum Veteran
 
Posts: 2261
Joined: Mon May 09, 2005 11:20 am
Location: Off The Planet

Re: OPTRO 740 comp / EQ doc's / schemo's ? (WANTED)

Postby Chris H » Thu Oct 22, 2015 8:51 pm

Here are the pics of the inductors. The board is under the other circuit board.

Inductors.jpg


....interesting that there is an opto cell on this board as well.

Comp_Inside.jpg
You do not have the required permissions to view the files attached to this post.
Chris Hallam.
https://soundcloud.com/hallamsound
Whatever floats your boat.
User avatar
Chris H
Forum Veteran
Forum Veteran
 
Posts: 2261
Joined: Mon May 09, 2005 11:20 am
Location: Off The Planet

Re: OPTRO 740 comp / EQ doc's / schemo's ? (WANTED)

Postby walding » Thu Oct 22, 2015 11:04 pm

Chris H wrote:
Paul Maybury wrote:I love my Optro gear, but I'd love it a lot more if there were some goddam schematics....


The story is they all went into the dumpster. Schematics and everything from his Clayton workshop.
A sad story really. Graham was a brilliant man whose business ventures did not bring him the economic security he deserved. With the recording equipment, accoustic design, micro processors and Sontron and Editron editing and syncro systems he covered a a lot of ground as an inovator.

Worth a read:

http://www.aesmelbourne.org.au/graham-thirkell/
click the links at the bottom for some great optro pics and info

http://www.retrotechnology.com/herbs_st ... itron.html

Press release for the comp:

ATN-Optro740-processor-3-sml.jpg


also I cant help thinking this comp, what with the EQ faders and the spectral comp section was the inspiration for the Avalon 747


Reverse smily face on the GE :x
Mark Ludwig

SHould of been a drummer
walding
Frequent Contributor
Frequent Contributor
 
Posts: 676
Joined: Sat Oct 29, 2005 5:43 pm

Re: OPTRO 740 comp / EQ doc's / schemo's ? (WANTED)

Postby Sammas » Thu Oct 22, 2015 11:12 pm

Paul Maybury wrote:The first price break is at 5 units. Anyone else?


*Waves hand*


The Tasmanian wrote:WOW!
Paul - that tape machine catalog pic has a 3 inch 24 track!!!!


MCI also prototyped a 3" 32 track tape machine. I don't think any 3" machines ever made production though.
Nath Turn bull.
Sammas
Frequent Contributor
Frequent Contributor
 
Posts: 972
Joined: Sat May 06, 2006 5:30 pm

Re: OPTRO 740 comp / EQ doc's / schemo's ? (WANTED)

Postby Paul Maybury » Fri Oct 23, 2015 11:41 am

T shirts run at about $45 each!! Pricey.
Does anyone have any other suggestions for somewhere that will do a short for us?
Cheers, Paul
Paul Maybury
Frequent Contributor
Frequent Contributor
 
Posts: 669
Joined: Tue Nov 17, 2009 3:07 pm
Location: Melbourne

Re: OPTRO 740 comp / EQ doc's / schemo's ? (WANTED)

Postby rick » Fri Oct 23, 2015 1:43 pm

What good can come of me optro bashing
None me thinks ? I better stop

But i can say your not quite right in the rollout call of technology cris t .


all the aussie tv stations including the abc had stacks and stacks of neve consoles
and studer tape machines
It was a total credit that optro got a look in at all little lone
With as many products as have surfaced .
If they had of hit the ball out of the park they would have made a F@#$ing fortune
And their multitrack tape machine was nothing if not an inspiration punt !

But reality is Lots of companies including neve went off the rails and bankrupt
making top quality Audio stuff , its a mugs game really

I am sure we all understand optro is home grown and graham was a genius .

I did the turtlerock tshirts at redbubble.com
Thats the simplest way to get it going
Its probably time i reran the forum tees too

But ill leave the secret society of broken optro technolgy to make their own :)
Rick O'Neil
I think we went to different schools together
turtlerockmastering.com
we listen
User avatar
rick
Moderator
Moderator
 
Posts: 3431
Joined: Fri May 06, 2005 8:02 pm
Location: Sydney

Re: OPTRO 740 comp / EQ doc's / schemo's ? (WANTED)

Postby rick » Fri Oct 23, 2015 1:51 pm

Optro tshirt logo


Optro
" hey do you have a schematic ?"
Rick O'Neil
I think we went to different schools together
turtlerockmastering.com
we listen
User avatar
rick
Moderator
Moderator
 
Posts: 3431
Joined: Fri May 06, 2005 8:02 pm
Location: Sydney

Re: OPTRO 740 comp / EQ doc's / schemo's ? (WANTED)

Postby walding » Fri Oct 23, 2015 2:16 pm

rick wrote:Optro tshirt logo


Optro
" hey do you have a schematic ?"



=))
Mark Ludwig

SHould of been a drummer
walding
Frequent Contributor
Frequent Contributor
 
Posts: 676
Joined: Sat Oct 29, 2005 5:43 pm

Re: OPTRO 740 comp / EQ doc's / schemo's ? (WANTED)

Postby Paul Maybury » Fri Oct 23, 2015 3:25 pm

Good one Rick. Maybe that can go on the back of the T shirt.
It is the secret handshake of the Optro Geek Club, after all.
Paul Maybury
Frequent Contributor
Frequent Contributor
 
Posts: 669
Joined: Tue Nov 17, 2009 3:07 pm
Location: Melbourne

Re: OPTRO 740 comp / EQ doc's / schemo's ? (WANTED)

Postby EvLoutonian » Fri Oct 23, 2015 9:27 pm

Haha
I like it.
That would be enough to tip me over the edge & get one!
As long as it was available in small chap size.
(:
Evan Lorden, Well Worn Workshops, Melbourne
EvLoutonian
Registered User
Registered User
 
Posts: 226
Joined: Wed Jun 09, 2010 12:46 pm
Location: Melbourne

Re: OPTRO 740 comp / EQ doc's / schemo's ? (WANTED)

Postby Alastair Reynolds » Sat Oct 24, 2015 6:31 am

Ah Optro and the "no docs patent" . In all my travels around little radio sites in Australia, I have only ever come across 1 Optro schematic which I will dig out and post for all to see.it is for a 50 w rms power amp. I have a 203 eq,,but no paperwork of any sort for it.
Alastair Reynolds
Broadcast Radio Engineer
Master of the Dark Arts (Broadcast)
User avatar
Alastair Reynolds
TRM Endorsed
TRM Endorsed
 
Posts: 473
Joined: Mon Dec 04, 2006 1:51 pm
Location: Sydney

Re: OPTRO 740 comp / EQ doc's / schemo's ? (WANTED)

Postby Chris H » Sat Oct 24, 2015 8:59 am

I have hand drawn schematics for the 7500....will dig them yo and scan them.
Chris Hallam.
https://soundcloud.com/hallamsound
Whatever floats your boat.
User avatar
Chris H
Forum Veteran
Forum Veteran
 
Posts: 2261
Joined: Mon May 09, 2005 11:20 am
Location: Off The Planet

Re: OPTRO 740 comp / EQ doc's / schemo's ? (WANTED)

Postby EvLoutonian » Sat Oct 24, 2015 9:05 am

Good one blokes!
Would be interesting to see what documentation is out there, even if just for the sake of piecing together some history of this company's output together..
Evan Lorden, Well Worn Workshops, Melbourne
EvLoutonian
Registered User
Registered User
 
Posts: 226
Joined: Wed Jun 09, 2010 12:46 pm
Location: Melbourne

Re: OPTRO 740 comp / EQ doc's / schemo's ? (WANTED)

Postby Alastair Reynolds » Sun Nov 01, 2015 5:04 pm

*** STOP PRESS ***
Prepare to get harder than a cats head.
I was doing some prep work today for a big AM transmission repair job I'm doing next week and was with my colleague who has been in the Audio: radio/TV game for 50+ years at his factory unit. He's a bit of a collector/ bowerbird and while we were packing the truck I noticed next to a pair of M49s he has 2x Optro 740. I asked what the story with them was. They were ex TV station, ABC or TCN, he couldn't remember . I asked casually " I don't suppose you've got a manual or schematic for them, his reply was "should have, I used to" we went up to his library level and poked around.... No 740 manual ..... It must be in one of the other boxes I haven't put on the shelves yet.. Bugger. We'll have to look when we get back... However, on a different shelf next to the 1960 Gates catalogue... A complete manual for a Optro 306 dual band limiter with schematic., which is probably the same as the compressor stage of the 740. I will scan it and make it available to all and will advise on the forum when it is ready . The schematic is A2 size so I'll need to go to office works to scan. We will also continue looking for the full 740 manual when I get back from the TX job in a week
Alastair Reynolds
Broadcast Radio Engineer
Master of the Dark Arts (Broadcast)
User avatar
Alastair Reynolds
TRM Endorsed
TRM Endorsed
 
Posts: 473
Joined: Mon Dec 04, 2006 1:51 pm
Location: Sydney

Re: OPTRO 740 comp / EQ doc's / schemo's ? (WANTED)

Postby EvLoutonian » Sun Nov 01, 2015 5:53 pm

Alastair Reynolds wrote:... A complete manual for a Optro 306 dual band limiter with schematic., which is probably the same as the compressor stage of the 740. I will scan it and make it available to all and will advise on the forum when it is ready . The schematic is A2 size so I'll need to go to office works to scan. We will also continue looking for the full 740 manual when I get back from the TX job in a week


You bloomin beautayyyy!

Great work, Alastair!
Shall be interesting to see what else also surfaces from your mate's document library, too.

Cheers, and shall look forward to more updates.
(:
Evan Lorden, Well Worn Workshops, Melbourne
EvLoutonian
Registered User
Registered User
 
Posts: 226
Joined: Wed Jun 09, 2010 12:46 pm
Location: Melbourne

Re: OPTRO 740 comp / EQ doc's / schemo's ? (WANTED)

Postby Junction » Sun Nov 01, 2015 9:09 pm

Alastair, I've got a 302 and 303 limiter-compressor, would be keen to see the schematic of the 306, could be a chance there is some similarities :)

Cheers mate
Michael Blackburn
michael@junctionaudio.com
Junction
Registered User
Registered User
 
Posts: 166
Joined: Wed Oct 20, 2010 4:28 pm
Location: Sydney

Re: OPTRO 740 comp / EQ doc's / schemo's ? (WANTED)

Postby Alastair Reynolds » Sun Nov 01, 2015 9:58 pm

I'll put this here to prove it exists, apologies for the shadow.
resolution is crappy as I've shrunk it to 800 x 600, but I'll email it if you want it before I get back.
You do not have the required permissions to view the files attached to this post.
Alastair Reynolds
Broadcast Radio Engineer
Master of the Dark Arts (Broadcast)
User avatar
Alastair Reynolds
TRM Endorsed
TRM Endorsed
 
Posts: 473
Joined: Mon Dec 04, 2006 1:51 pm
Location: Sydney

Re: OPTRO 740 comp / EQ doc's / schemo's ? (WANTED)

Postby Chris H » Mon Nov 02, 2015 9:10 am

Fantastic!
Chris Hallam.
https://soundcloud.com/hallamsound
Whatever floats your boat.
User avatar
Chris H
Forum Veteran
Forum Veteran
 
Posts: 2261
Joined: Mon May 09, 2005 11:20 am
Location: Off The Planet

Re: OPTRO 740 comp / EQ doc's / schemo's ? (WANTED)

Postby Junction » Mon Nov 02, 2015 11:13 am

awesome Alastair :) Wenever you get around to it, would you be able to email it to me? A print of the picture is a bit fuzzy, not so easy to read the component values.

Cheers
Michael Blackburn
michael@junctionaudio.com
Junction
Registered User
Registered User
 
Posts: 166
Joined: Wed Oct 20, 2010 4:28 pm
Location: Sydney

Re: OPTRO 740 comp / EQ doc's / schemo's ? (WANTED)

Postby rob » Mon Nov 02, 2015 6:51 pm

now i'm interested!
I've had a few optro pieces through the workshop over the years. And without any documents got them all going.
Including building a replacement module to replace one of those coloured potted modules ... without knowing the contents of the sealed module ... spooky

that schematic that Alistair has uncovered is extraordinarily interesting. Yes, it is optical gain reduction ... with a twist. Who can spot it? It is something that you'd be more likely to expect in processing audio for radio transmission so Alistair will see it. Who else?
User avatar
rob
TRM Endorsed
TRM Endorsed
 
Posts: 998
Joined: Tue May 10, 2005 9:16 pm
Location: Adelaide

Re: OPTRO 740 comp / EQ doc's / schemo's ? (WANTED)

Postby Junction » Tue Nov 03, 2015 10:59 am

rob wrote:now i'm interested!
Yes, it is optical gain reduction ... with a twist. Who can spot it? It is something that you'd be more likely to expect in processing audio for radio transmission so Alistair will see it. Who else?


... is it as simple as a dual band limiter, most commonly found in radio broadcast chains in the 70's?
Michael Blackburn
michael@junctionaudio.com
Junction
Registered User
Registered User
 
Posts: 166
Joined: Wed Oct 20, 2010 4:28 pm
Location: Sydney

Re: OPTRO 740 comp / EQ doc's / schemo's ? (WANTED)

Postby Alastair Reynolds » Tue Nov 03, 2015 5:35 pm

Correct, Dual band, I think the split is at about 300Hz, Plus the release time for the LF is longer than the HF .
I have had the advantage of reading the rest of the documentation (briefly before I left to travel north) It is a very interesting device. I hope this goes someway to helping with other Optro Compressors and I will keep on the case to find more Optro documentation and make it available.
Alastair Reynolds
Broadcast Radio Engineer
Master of the Dark Arts (Broadcast)
User avatar
Alastair Reynolds
TRM Endorsed
TRM Endorsed
 
Posts: 473
Joined: Mon Dec 04, 2006 1:51 pm
Location: Sydney

Re: OPTRO 740 comp / EQ doc's / schemo's ? (WANTED)

Postby rob » Tue Nov 03, 2015 8:10 pm

Good work team
User avatar
rob
TRM Endorsed
TRM Endorsed
 
Posts: 998
Joined: Tue May 10, 2005 9:16 pm
Location: Adelaide

PreviousNext

Return to The Turtlerock Forum

Who is online

Users browsing this forum: No registered users and 1 guest