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Watch Groundhog Day tonight...

Unlike bipolar transistors (negative tempco on the B-E junction), MOSFETs share current naturally when parallelled (positive tempco on the D-S junction, Rds increases as they heat up). However, parallelling MOSFETs can lead to oscillation issues and damping resistors are needed to kill any...

Because of the oxygen free string that is being used...

The dot is official, not the bar. TI has a spec for where the pin 1 marking needs to occur and that bar does not conform.

Just no comparison... DTS402 Vceo = 400V Collector current max 3.5A Power dissipation max 100W Ft = 2.0 Mhz Hfe = 10 @ 3A SOA unrated Ignition coil transistor MJ21196 Vceo = 250V Collector current max 16A Power dissipation max 250W Ft = 4.0 Mhz Hfe = 25 @ 8A SOA is rated Audio transistor

Not a chance...

2024 September Malaysia

The 5532 looks legit, proper date coding and pin 1 marking applied, unlike the OPA 1656 you showed earlier.

Should have the BB logo instead of the TI logo (TI owns and uses the BB logo on BB parts), and I do not see that on those parts.

Some of the event timing looks unbelievable Lee

It was so close twice, and then they sent it back to Chicago...

Bob wished his original design looked like this... If it did, maybe we would not be refurbishing it.

Sea Level reminds me somewhat of Santana (and also of some of the Allman brothers stuff). Good sound.

What markings are on your Aliexpress parts?

Many TI Burr Brown parts are made in Malaysia. The Burr Brown OPA134s that I purchased directly from TI have the marking 36AYT6K 3 6 AYT6 K = Y M LC Site Meaning 2023, June, Lot Code AYT6, Malaysia It appears that TI does not have current US assembly sites for their parts, at least...

Hallucination is when AI doesn't know and just makes things up to give you an answer. You have to be very careful about AI lying to you. Often it stitches a story together based on some real facts about related items but the leap it takes in doing that is false. I yell at AI frequently for...

Me thinks that your AI is hallucinating on you...

Welcome Ben

Not surprised Perry, the unit is very nice looking with all those upgrades.