Check the Contacted Element

# Check the Contacted Element: Where the Placement Gamble Finally Resolves

Step thirty's placement probability and step thirty-one's alloy-zone forgiveness were both framed in terms of likelihood — this step is where that likelihood resolves into a real, measured outcome for this specific device. A pulse bond can complete mechanically sound, gold-germanium alloyed cleanly, wire firmly attached, and still have landed in a dead zone that produces three correctly-soldered leads with no actual transistor action between them. This step's measurement is the first point since bonding where the device either demonstrates genuine current gain or reveals that step thirty's gamble, however favorable the odds, didn't pay off for this particular bar.

## 1. Rectification at Both Junctions Is Necessary but Not Sufficient

$$\alpha_{\text{measured}} > 1 \;\Rightarrow\; \text{genuine transistor action}; \qquad \alpha_{\text{measured}} \approx 0 \;\Rightarrow\; \text{diode-only, placement failed}$$

A device with all three leads correctly soldered and bonded will show rectifying behavior at both the emitter and collector junctions regardless of where exactly the base wire landed, because those junctions were already formed back in steps fifteen and eighteen and don't depend on this step's contact placement at all. What does depend on correct base-wire placement is current gain — if the base wire landed in a region disconnected from the actual thin base, or the alloy zone from step thirty-one's bond failed to reach it, the device behaves as two back-to-back diodes with no amplification, passing a simple continuity check while failing the one measurement that actually confirms transistor action.

## 2. Real Diagram: Testing All Three Leads Before the Can Closes

Confirming Gain, Not Just Continuity, Before Encapsulation all three leads can be mechanically sound while only two of them actually matter electrically emitter base collector probe 1 probe 2 probe 3 rectification alone: inconclusive current gain measured: the real test only the second one confirms step 30's gamble paid off

## 3. This Is the Last Measurement Before the Point of No Return

$$t_{\text{check (step 32)}} < t_{\text{encapsulation (step 34)}}$$

Like step twenty-eight's rinse deadline, this check has a hard boundary a short distance ahead: once the can seals in step thirty-four, there is no later opportunity to discover that a mechanically perfect bond never actually made electrical contact with the base. Catching a gain-less device here costs only the material and labor already invested through step thirty-one; catching the same defect after encapsulation wastes the sealing step as well, for a device that final parametric test would have caught anyway, just at a much higher sunk cost.

Measured Gain Across a Batch of Bonded Bars step 30's placement probability, now realized as actual test outcomes measured α → number of bars α≈0 diode only genuine transistor action scrap threshold everything left of the line is scrapped here, not after encapsulation

## Check the Contacted Element's Place in the Process Lineage

Checking the contacted element is step thirty-two of the 1951 grown-junction transistor's full manufacturing sequence — the final step of converting the crystal into individual transistor elements, after the base wire has been pulse-bonded, and before the completed assembly is inspected for final packaging. It is the step where step thirty's placement probability and step thirty-one's bonding forgiveness finally resolve into a measured, device-specific pass or fail, with the device's distinguishing property — real current gain, not mere continuity — as the actual test.

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