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Two unknown circuit boards from a 70's era kit amp?
Two unknown circuit boards from a 70's era kit amp?
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Old 12th September 2020, 11:58 AM   #1
yardiron is offline yardiron  United States
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Default Two unknown circuit boards from a 70's era kit amp?

Two circuit boards found in cleanout, in box from SWTP 1973.


Any idea what these are?


I'm thinking these are part of the their Lil Tiger MKII amp kit?


The boards are marked 176a

They were in a box with an assortment of parts from Southwest Technical Products in TX.



I found this catalog online: http://www.wass.net/othermanuals/SWTPC.pdf
I'm thinking the pic on PG 4 looks like it may be built on these boards?
Attached Images
File Type: jpg 176A (1).jpg (536.7 KB, 185 views)
File Type: jpg 176A (2).jpg (543.1 KB, 181 views)
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Old 12th September 2020, 12:55 PM   #2
as_audio is offline as_audio
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This one looks at least similar :
https://www.updatemydynaco.com/Histo...ersalTiger.pdf
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Old 12th September 2020, 01:06 PM   #3
tsmith1315 is offline tsmith1315  United States
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Search "Universal Tiger" in the solid state forum

SWTPC Universal Tiger Rebuild For Analysis
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Old 12th September 2020, 08:13 PM   #4
yardiron is offline yardiron  United States
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Sure looks similar but the traces on the back side of the board I have don't seem to match up the same. The front component locations look very similar though.
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Old 12th September 2020, 09:00 PM   #5
as_audio is offline as_audio
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Sorry on your boards I read 175A
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Old 12th September 2020, 09:13 PM   #6
as_audio is offline as_audio
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Your boards have the additional current limiters Q10 and Q11:
Universal Tiger
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Old 14th September 2020, 11:00 AM   #7
yardiron is offline yardiron  United States
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Are these worth messing with?



I have the boards, and likely can dig up most of the smaller components to go on them but no transformer, no heatsinks or power transistors.
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Old 14th September 2020, 11:15 AM   #8
as_audio is offline as_audio
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some forum member may be interested
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Old 14th September 2020, 11:20 PM   #9
yardiron is offline yardiron  United States
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What are the two boards worth?
What sort of amp do they build?
Is the Universal Tiger anything special or worth building?

As much as I'd like to put something together, unless its going to be something really special to listen to, I think my time and money is better spent elsewhere these days.
I wouldn't have the first clue where to get a lot of the parts to build these, especially the transformer or else a suitable stand alone power supply.
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Old 14th September 2020, 11:36 PM   #10
JMFahey is offline JMFahey  Argentina
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Price of anything is whatever somebody will actually pay for it.
I suggest you search around for old PCB prices, ask something similar and be flexible if you get a more or less reasonable counter offer.
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