Tiger .01 from the 1976 Catalog

The .01 was rated at 65 watts @ .01 IM distortion. It was known to blow away amps with more powerful ratings. It was a full complementary symmetry DC coupled class AB design.

.01 Schematic

16 Responses to .01

  1. Ben Hacker says:

    Very nice SWTPC info site! I’m very impressed. Thank you for taking the time to do this as these products deserve a place in audio history. I am 60 and have worked in the electronics field most of my life. In the 70’s I worked as an audio tech for a local stereo shop and had the pleasure of building several Tiger .01’s and found them to be great sounding amps. I also bought a 195A preamp from a friend. Recently, nostalgia took ahold of me and I bought three .01’s off Ebay and rebuilt 2 of the 3. I hope to get the 3rd one going soon. I’d also like to buy a 215 if I can find one. I still love the Tiger’s and don’t think that I would part with them. Thanks again for your great collection of SWTPC stuff.

  2. Scott Robb says:

    I built a pair of Tiger .01 amps as part of my first real stereo. Great to see this wonderful web site you have devoted to SWTPC products!

  3. Charles Krenz says:

    Hope someone can help…..Was GIVEN a pair of Tiger .01’s……….Do I plug into the AC or DC phono jack on the back…………..

    • pacazo says:

      Plug into the AC jack. I don’t know if you fired them up yet but a dim bulb tester is a great idea if you haven’t.

    • Anton M says:

      Safer to use the AC input, but you can use the Direct Coupled input if you check with a good meter to be sure your preamp has NO DC offset.

  4. Ben Hacker says:

    I recently built a case for two of my .01’s and added 2 variable speed fans (with on/off sw) and blue led meter lamps. I’d like to share a jpg or 2 if anyone would be interested and if there is a way to do this. Thanks and keep the tigers roaring!

    • pacazo says:

      I like the idea of the lamps but would personally pass on the fans. My .01 s don’t get hot. Proper biasing helps. I would like to see your rig though. Can you post it somewhere where I can link it?

    • Anton M says:

      I’d like to see the project too. If you enclose them too much then you may need the fan. I’d use a thermal switch and to minimize noise and dust accumulation. One fan directly over the heatsinks blowing upwards should more than do it.

  5. Eugenia says:

    Thank you for the informative site. I have built all three Tiger amps. Most recently, after 30 years of abuse, the power supply capacitors have failed on 2 out of 4 – .01 amplifiers. It’s an easy repair and probably most will benefit from changing these out. At Altronics in Perth, Australia I located some 105’C electrolytic 10,000uF, 50 VDC with the same 35mm diameter footprint for about $10.00. If you are a surplus shopper there are plenty of 5,500uF, 50VDC capacitors available with larger footprints. After removing the too small capacitor chassis mounts and relocating the Xformer and some wiring it was possible to fit much larger outline capacitors, however, the cover needed to be removed.

    • pacazo says:

      I am sure that the 10K units work, but I doubt that there is any noticeable benefit to them. The last caps I installed in one of my units were 4K and cost a couple of bucks each. Smaller footprint but no issues and the amps sound amazing. Be sure to view my post on cap replacement. You can see that I like big buss. (Pun intended). The Mallory’s I used were also 4K but I picked them because they matched the original package size and I thought they looked cool.

  6. Jamie says:

    I have two Tiger .01 amps I built in the 70’s. One of them still sounds great; the other has significant distortion. Any suggestions on how to determine why? I may start by checking the voltages in the schematics on this site.

    • pacazo says:

      I would start with the fuses. Maybe I can get my buddy Anton to chime in as he is more of an amp techie. I love my .01 s and am listening to them as I type.

    • Anton M says:

      Certainly check fuses and that no wires are broken or resistors burnt, etc. If there is an obvious hum then likely your power supply capacitors are bad, pretty common at this age. Checking voltages is the next step. If you read the text of the original article he does a good job of going through everything. Start with the +&- 40VDC at the power supply. Next check the DC offset at the output terminals.
      If there is more than 0.1v DC at the output terminals, STOP, turn off power and unplug the base and emitter leads of the output transistors. The amp can run and should sound good with the outputs unplugged (at a low volume), though it will only put out maybe a third of a Watt. If it still sounds bad like that, check all the other test point voltages.

  7. Ben Hacker says:

    Here are pictures of my Stereo Tiger that I recently built into an old BGW amplifier chassis…….. https://www.dropbox.com/sh/ze6tae7kj7bh7c9/AACYL9chzzIQt9V2Mh69lJnTa?dl=0

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