G-m-L "Doa" pcb-kit

[ruairioflaherty]

Oh yeah! I totally agree with letting the stuff sell itself... Now that I have this great GML automation system I really want more unsupported crap. New I'm sure the profit margin net was at least 50% on this garbage. After the hell its taken to find out I cant get the automation working I'm ready for a little retribution....

I can't tell if this is sarcasm or not but how long did you expect the GML automation system to be supported?  Poking holes in George about profit motives is pretty out of place IMO, he is driven by a love of music, people and technology and is one of the more inspiring figures in the industry.

I've been inside a GML 8304 pre for a look and the opamp is one small part of the whole system, cloning it will not get you far. 

Ruairi

 

[bluesbaz]

Ok so maybe I am a bit upset, but I didn't ask the guy to come fix the unit I asked for some advice and received no response of any kind. The guy seams rather angry about the whole thing from the few people I know who have gotten him to discuss the system. Frankly the idea of "supporting" a system is lame. I'm not making changes to os's or adding software. I'm also not asking for free advice either, I dont mind paying if someone can deliver. I take offense to the attitude and vibe which creates an enemy out of past clients. I dont wish ill will to old MR GM. I just ask that he respond in kind to my professional, courteous, request for support on a system he created.
-s

Insert Quote
Quote from: bluesbaz on Today at 04:54:48 am
Oh yeah! I totally agree with letting the stuff sell itself... Now that I have this great GML automation system I really want more unsupported crap. New I'm sure the profit margin net was at least 50% on this garbage. After the hell its taken to find out I cant get the automation working I'm ready for a little retribution....

I can't tell if this is sarcasm or not but how long did you expect the GML automation system to be supported?  Poking holes in George about profit motives is pretty out of place IMO, he is driven by a love of music, people and technology and is one of the more inspiring figures in the industry.

I've been inside a GML 8304 pre for a look and the opamp is one small part of the whole system, cloning it will not get you far. 

 

[mitsos]

So what d'ya know? I logged into the mail account to find something else and what was in the first message? That old GML opamp schematic...

 

[r2d2]

you are so right ...
also ssl compressor is still in "power on"...
peace!

again, the gml was never out of production..

 

[okgb]

Was there anything  " special " or novel about the opamp ?
or was it just hiding ordinary [ or well designed for the time ? ]

 

[mjrippe]

So what d'ya know? I logged into the mail account to find something else and what was in the first message? That old GML opamp schematic...

Care to share that file?  GDIY gmail account won't let me in without verification.  What was Roddy's cat's name circa 2012?

 

[gyraf]

GDIY gmail account is out of order and unfixable. Consider content lost.

Jakob E.

 

[mitsos]

Here it is. Not sure where this came from originally.

 

[mitsos]

This pic was there with it.

 

[mjrippe]

Thanks Mitsos!

 

[peterc]

a quote from Greg at Electrical Audio's Tech Room:



Postby greg on Tue Jul 13, 2004 1:31 pm
More on the Sontec
I built a channel with the 990 op amp as the o/p driver (5534 as the i/p amp) and did some listening tests yesterday. After calibrating the offsets and noiseless switching circuit I couldn't notice a change in sound quality. I had a mono signal split to the two inputs. I monitored the o/p as a stereo signal with the eq in bypass (signal goes through the two replacement amps in bypass). There was no deviation from mono. I like listening to things this way to see if there is a difference, then trying find out what the difference is (phase shift, eq, level, and so on). In this crude listening test the two channels sounded almost identical (eq in and out). The noise floor was not improved by the new amps, but it wasn't worse either. My main complaint with the Sontec amps was that they occasionally made low level hissing and crackling noises (even new ones!).
I cut the test short when I discovered a harmonic of the power supply regulator on the right channel (very quiet, but there). This was with the eq filters at max gain. At first I thought the 990 was drawing too much current, but after I swapped the channel's op amps I realized that it was the power supply itself causing the problem. On our Sontec the bridge rectifier, a regulator, and main filter caps are about 1-2 inches from the right channel's amps and bypass circuit. The transformer is also on that side of the box. I brought the eq back to the shop and powered it up with the bench supply. No buzz. So now I am going to power it remotely.
Some other notes:
John Hardy said that his amp will work at 28 Volts but be a bit hot. He wasn't joking. It gets HOT. It's probably a good idea for me to regulate the +-28V down to 24V in the end.



http://www.electricalaudio.com/phpBB3/viewtopic.php?f=5&t=491&hilit=5534&start=60

 

[waltzingbear]

and we know they will work at 28V because  we have been using them at 28V for several years in a Quad Eight Ventura.

CHeers
Alan