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Old 4th December 2012, 04:10 AM   #231
Bonsai is offline Bonsai  Europe
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Pretty solid looking beast! That thing will last for another 50 years.
Amplifier Design and Construction for MUSIC! http://hifisonix.com/
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Old 5th December 2012, 04:07 PM   #232
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What is *funny* is that it is still working - with the long runs to the output devices and all...

Maybe the self inductance of the longer wire and the added shunt capacitance is actually a benefit in keeping it stable?? That's contrary to all the advice I've seen given on that amps construction.

You never know.


PS. nice sized xfrmr from Signal Transformer company!
http://www.bearlabs.com -- Btw, I don't actually know anything, FYI -- every once in a while I say something that makes sense... ]

Last edited by bear; 5th December 2012 at 04:27 PM.
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Old 5th December 2012, 10:09 PM   #233
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I recall instability on mine kicking in during just one half of the output waveform. It was more like a ringing effect that blurred the oscilloscope trace.
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Old 27th January 2017, 10:59 PM   #234
PB2 is offline PB2  United States
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Conrad Hoffman measured his scratch built Tiger here, it is the early version without output protection:
Bob Cordell Interview: Negative Feedback

Put the link here since it is easy to forget in that long thread.

Also PMA, but is this a Tiger, not sure what amp he is talking about:
Bob Cordell Interview: Negative Feedback
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Old 27th January 2017, 11:41 PM   #235
rickl is offline rickl  United States
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Here is a pic of one of mine. I have two. Picked them up around 1978. They survived college frat use (abuse?) and now have retired. I know one needs new PS caps. Probably both need a cap job.

I enjoy seeing these old amps but have moved on to other gear.
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searching for jazz and a little libations.
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Old 28th January 2017, 12:10 AM   #236
lhquam is offline lhquam  United States
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I had 6 Universal Tigers from the mid 70s and used them for close to 10 years before investing in a Hafler-500. During that time one of the Tigers went up in smoke from the oscillation problem. Could have been due to an open input or input cable end near speaker output wires.
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