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yardiron 12th September 2020 11:58 AM

Two unknown circuit boards from a 70's era kit amp?
2 Attachment(s)
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:
I'm thinking the pic on PG 4 looks like it may be built on these boards?

as_audio 12th September 2020 12:55 PM

This one looks at least similar :

tsmith1315 12th September 2020 01:06 PM

Search "Universal Tiger" in the solid state forum

SWTPC Universal Tiger Rebuild For Analysis

yardiron 12th September 2020 08:13 PM

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.

as_audio 12th September 2020 09:00 PM

Sorry on your boards I read 175A

as_audio 12th September 2020 09:13 PM

Your boards have the additional current limiters Q10 and Q11:

yardiron 14th September 2020 11:00 AM

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.

as_audio 14th September 2020 11:15 AM

some forum member may be interested

yardiron 14th September 2020 11:20 PM

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.

JMFahey 14th September 2020 11:36 PM

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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