New member, old techie

Doug76 · 13th January 2010, 10:19 PM

Looking for the schematic of the old Tigersaurus. Built one of these in the mid 80's (mono for subwoofer drive) from an article in Radio Electronics. No longer have that magazine, and want to get it up and running again.
Doug

llwhtt · 13th January 2010, 11:33 PM

Send me your email, I have the whole manual loaded and ready to go.

Craig

nigelwright7557 · 14th January 2010, 12:05 AM

Googled the tigersaurus and it doesnt look good !

Taming the Tigersaurus [Archive] - AudioKarma.org Home Audio Stereo Discussion Forums

Doug76 · 14th January 2010, 12:45 AM

Never had trouble with mine. In my tech days I used to upgrade circuits in equipment, so I overbuilt mine a bit. It was used for 10 years, then set aside. When I fired it up a few weeks ago, it didn't work. So now I get to fix it.

jaycee · 14th January 2010, 06:40 AM

Radio Electronics December 1973

That circuit gives me the creeps. Sziklai output stages are tricky at the best of times, but with the output transistors on long wires... *shudder*, no wonder they used to explode!

The cascode arrangement in the output section seems silly to me... while there are current sharing resistors at the top of the cascode devices, these are then negated by the cascode devices collectors being tied together.

Those RCA transistors are likely to be unobtainable unless you want to risk eBay.

Doug76 · 14th January 2010, 02:40 PM

Agree with what you say. My output transistors were mounted differently than shown in the article, And I used a pcb of my making to attach them, and kept the wires short.

llwhtt · 14th January 2010, 03:07 PM

Doug,

I have the Tigersaurus assembly manual from SWTP. Let me know if you want it.

Craig

Doug76 · 14th January 2010, 03:12 PM

Thank you, I managed to find the original assembly article from Radio Electronics online.
I've already noted a few more ways to improve it, hopefully. Although the way I built it turned out stable, a few more improvements aren't going to hurt it.

wahab · 14th January 2010, 04:54 PM

the output compound pair is with voltage gain
to compensate the +- 10V loss in the dual differentials
collectors resistances...
this will amplify the thermal shift of the output stage..
not to mention that it s more prone to oscillations than an emitter
follower, not even counting the tricky compensations schemes..
no wonder that some builders have instability issues with it..

Doug76 · 14th January 2010, 04:58 PM

Yep, prefer emitter followers myself, but I got this one working fine when I originally built it.

13th January 2010, 10:19 PM	#1
Doug76 diyAudio Member Join Date: Jan 2010 Location: Louisiana	New member, old techie Looking for the schematic of the old Tigersaurus. Built one of these in the mid 80's (mono for subwoofer drive) from an article in Radio Electronics. No longer have that magazine, and want to get it up and running again. Doug

14th January 2010, 12:05 AM	#3
nigelwright7557 diyAudio Member Join Date: Apr 2008 Location: Carlisle, England	Googled the tigersaurus and it doesnt look good ! Taming the Tigersaurus [Archive] - AudioKarma.org Home Audio Stereo Discussion Forums __________________ http://www.murtonpikesystems.co.uk PCBCAD40 pcb design software.

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13th January 2010, 11:33 PM	#2
llwhtt diyAudio Member Join Date: Jun 2008	Send me your email, I have the whole manual loaded and ready to go. Craig

14th January 2010, 12:45 AM	#4
Doug76 diyAudio Member Join Date: Jan 2010 Location: Louisiana	Never had trouble with mine. In my tech days I used to upgrade circuits in equipment, so I overbuilt mine a bit. It was used for 10 years, then set aside. When I fired it up a few weeks ago, it didn't work. So now I get to fix it.

14th January 2010, 06:40 AM	#5
jaycee diyAudio Member Join Date: Apr 2004 Location: Norwich, UK	Radio Electronics December 1973 That circuit gives me the creeps. Sziklai output stages are tricky at the best of times, but with the output transistors on long wires... shudder, no wonder they used to explode! The cascode arrangement in the output section seems silly to me... while there are current sharing resistors at the top of the cascode devices, these are then negated by the cascode devices collectors being tied together. Those RCA transistors are likely to be unobtainable unless you want to risk eBay.

14th January 2010, 02:40 PM	#6
Doug76 diyAudio Member Join Date: Jan 2010 Location: Louisiana	Agree with what you say. My output transistors were mounted differently than shown in the article, And I used a pcb of my making to attach them, and kept the wires short.

14th January 2010, 03:07 PM	#7
llwhtt diyAudio Member Join Date: Jun 2008	Doug, I have the Tigersaurus assembly manual from SWTP. Let me know if you want it. Craig

14th January 2010, 03:12 PM	#8
Doug76 diyAudio Member Join Date: Jan 2010 Location: Louisiana	Thank you, I managed to find the original assembly article from Radio Electronics online. I've already noted a few more ways to improve it, hopefully. Although the way I built it turned out stable, a few more improvements aren't going to hurt it.

14th January 2010, 04:54 PM	#9
wahab diyAudio Member Join Date: Nov 2009 Location: algeria/france	the output compound pair is with voltage gain to compensate the +- 10V loss in the dual differentials collectors resistances... this will amplify the thermal shift of the output stage.. not to mention that it s more prone to oscillations than an emitter follower, not even counting the tricky compensations schemes.. no wonder that some builders have instability issues with it..

14th January 2010, 04:58 PM	#10
Doug76 diyAudio Member Join Date: Jan 2010 Location: Louisiana	Yep, prefer emitter followers myself, but I got this one working fine when I originally built it.

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