Universal Tiger - Page 13 - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 4th December 2007, 11:03 AM   #121
AKSA is offline AKSA  Australia
diyAudio Member
 
Join Date: Sep 2001
Location: Melbourne, Australia
Bonsai,

I thought that rather good......

Almost seussian, one might say......

Hugh
__________________
Aspen Amplifiers P/L (Australia)
www.aksaonline.com
  Reply With Quote
Old 4th December 2007, 11:25 AM   #122
diyAudio Member
 
jacco vermeulen's Avatar
 
Join Date: Oct 2004
Location: At the sea front, Rotterdam or Curaçao
Send a message via Yahoo to jacco vermeulen
Come on in, Tiger lovers.

Here at the Tiger-Twister we're slashing Tiger in half.
Give us an offer on our vast selection of Tigers, this is a Tiger blow-out allright.
We got white Tiger, black Tiger, spanish Tiger, yellow Tiger.
We got hot Tiger, cold Tiger, we got wet Tiger, we got smelly Tiger.
We got hairy Tiger, bloody Tiger, we even got snappin Tiger.
We got silk Tiger, velvet Tiger, nauga-hyde Tiger.
Come on, you want Tiger.
If we don't have it, you don't want it
Come on in, Tiger lovers!
__________________
The buck stops Here
  Reply With Quote
Old 4th December 2007, 01:21 PM   #123
Bonsai is offline Bonsai  Taiwan
diyAudio Member
 
Bonsai's Avatar
 
Join Date: Jul 2003
Location: Taipei, Taiwan
Thanks Hugh
__________________
bonsai
Amplifier Design and Construction for MUSIC! http://hifisonix.com/
  Reply With Quote
Old 6th April 2008, 08:45 PM   #124
diyAudio Member
 
Join Date: Dec 2004
Location: Longmont, Colorado
Quote:
Originally posted by DomLeBel
Allen,
many many moons ago, i built the plastic tiger and could not source the SS1122/1123. I got a hold of some people at Motorola and they told me that these were special marked for SWTP. They told me to use MM3007 and MM4007. When you look at the amplifiers that Dan Meyers designed, the MM3005 and MM4005 are showing up. These are a lower breakdown voltage of the same transistors.
Dominique

Dominique,

Been quite a while since I've checked the thread obviously. I haven't broke out the tiger since then. Hope to put it on the bench soon.
Thanks for the info on the SS1122/1123's.
Have you used the MM3005/4005? If so, how'd they work out?
I recently stumbled on a list of articles from Audio amateur back in 74. I'll try my local library to see if it's available for copying. Looks like it has some upgrade info for the Tigers in it. (AUDIO AMATEUR 1/1974 [Oct 1974] (v.5#1) pg. 20).
One of these days I hope to have a pair up and running again-mostly for nostalgia but I did enjoy the sound when they were paired with my old Mk C-22 and a decent turntable.

Allen
  Reply With Quote
Old 8th April 2008, 05:37 AM   #125
diyAudio Member
 
Join Date: Dec 2005
Location: Seattle, WA, USA
Allen,
I can vouch that the 2N5416\3440 works for the SS1122\1123. I rebuilt a pair of Tiger .01s a couple years ago. They still run the mids in my tri-amped system. I also used MJ15015\15016 outputs. I have a small stash of original 40409 and 40410 drivers, and most of an unbuilt "Brute 70" Amp from the late 60's. I added the small caps as per Jan's schematic. Any $50 chipamp will far surpass it, but when you get to the age you can remember them new, you can't hear anyway......

Bob G.
  Reply With Quote
Old 11th April 2008, 07:53 PM   #126
diyAudio Member
 
Join Date: Dec 2004
Location: Longmont, Colorado
Bob,

I'm now shopping for a newer pair of eardrums with improved frequency response. I'm guessing I'm now about 6 db down at 12khz but seem to be ok in the 25 hz range.

Let me know what chipamps you've had good results with. I've wanted to experiment with them but never got around to it.

Allen
  Reply With Quote
Old 12th April 2008, 12:09 AM   #127
diyAudio Member
 
Join Date: Dec 2005
Location: Seattle, WA, USA
A good place to start would be http://www.chipamp.com/
Hang on to those Tigers though. A lot of nostalgia there. Might be the next Dynaco ST70.....OK, no, but keep them anyway.

Bob G.
  Reply With Quote
Old 12th April 2008, 12:44 AM   #128
diyAudio Member
 
Join Date: Mar 2007
Location: Canandaigua, NY USA
They can be tough to find from the top level, but here's where you can get copies of many of Dan Meyer's articles, including the Tiger amps-

SWTP site
__________________
I may be barking up the wrong tree, but at least I'm barking!
  Reply With Quote
Old 1st July 2009, 04:33 PM   #129
diyAudio Member
 
Join Date: Jul 2009
Default My Universal Tiger experience

I built four UTs in the 1974 time frame. By then, it was a well known fact that the original UT circuit overloaded its output stage bias resistors, which were made from carbon film resistors, which of course are unstable. The output bias drifted, and then the output stages failed.

I redesigned the circuit to increase the power rating on these parts. I changed the PC board artwork to accommodate the power resistors, but otherwise followed the original circuit.

One other modification I stumbled on, and that was the mounting of the thermal feedback diodes on the heatsinks. On two of the four channels I used the common diode clips, made from sheet metal. On the other two channels, I ran out of diode clips, so I drilled holes in the heatsinks and press-fit the diodes. This change was critical to thermal stability. I could adjust the output bias to optimum levels in the press-fit channels, but could never do that in the clip-mounted channels, because those channels would blow their DC fuses at high volumes.

I still have that four-channel UT, and it still works. There has never been an AC stability problem. However, I could imagine drifting DC bias causing AC instabilities.
  Reply With Quote
Old 2nd July 2009, 02:21 AM   #130
diyAudio Member
 
Electrone's Avatar
 
Join Date: Jan 2007
About 30 years ago, I bought two Tiger boards with output heatsinks and transistors that were the original kits from a garage sale. The price was $10, IIRC, to my excitement. I still remember clearly the table sitting outside on that road not far from here. There were the kits along with the 1970 Popular Electronics issue containing the pertinent article by Dan Meyers. I also recall that the numbers printed on the MJ802/MJ4502 aluminum transistors were very worn.

I tinkered with the amps for hours on end and can't really recall much trouble with oscillation as checked with my tube oscilloscope. I definitely saw some approximately 5Vp-p oscillation kick in when the output voltage approached the one of the power supply rails (The positive one?) in some tinkered versions. I knew little about layout and compensation at the time, other than what was printed in the article. Yet studying the article as well as tinkering with the amps was how I really obtained a somewhat decent understanding of transistor theory.

I replaced the output transistors with steel ones most certainly because I blew the aluminum ones which the original owner had managed to nurse so well.

I eventually sold the amp to my brother with a microwave oven fan cooling the heatsinks and with MJ2905/2N3055 output transistors. I had the power supply cranked up to about +/-55V (no load) for a long time before I revamped it to how it was when I sold it. Then it ran off of the stock voltage, again.

As a side note, I once purchased some RCA 2N3055 which I employed as ignition point savers for my car ignition system. They broke down at 120V. I know because the coil flyback voltage would square off at that voltage level. They lasted for years of driving without failure. I was always ready to remove it if the car were to stall due to it failing, but it always worked even after I sold the car to a friend. It was still in there, I guess when the engine finally threw a connecting rod. He had gotten in touch with me too help him diagnose the problem, and when we parked the clattering car for the last time, I guess it was still in use.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Swtpc Universal Tiger Improved And Simulation PB2 Solid State 91 3rd June 2011 06:50 PM
Tiger 207\A Formosa Parts 1 4th April 2009 02:08 PM
SWTP Universal Tiger help: works, but very low power kevinabb Solid State 4 31st January 2008 05:45 AM
Tiger Amp Boss_Ronald Solid State 1 16th January 2008 07:26 PM
SWTPC Universal Tiger 100 Allen Bartee Solid State 3 26th April 2005 04:10 AM


New To Site? Need Help?

All times are GMT. The time now is 01:40 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright ©1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2