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Defibrillator pulses deliver massive energy to a patient. If the internal defibrillation protection circuits (gas discharge tubes, transient voltage suppression diodes) fail, the downstream semiconductor amplifiers will destroy themselves.
Handle initial microvolt signal amplification from electrodes.
These manuals were originally published by Sylvania and later Philips/NTE. They contain cross-references for over 200,000 industry part numbers. ECG Semiconductors Master Replacement Guide (19th Edition)
If you cannot find a part in the ECG guide, it is often due to the, age of the document. Consider using online databases like or specialized cross-reference forums to find modern replacements for archaic semiconductors.