shop-built UV-201? triode

Cruft Laboratory, Harvard University

Date: 1938

Object number: VT0224

Cruft Laboratory, Harvard University

Date: 1939

Object number: VT0208

Cruft Laboratory, Harvard University

Date: 1938

Object number: VT0223

Cruft Laboratory, Harvard University

Date: 1936

Object number: VT0225

Cruft Laboratory, Harvard University

Object number: VT0233

Cruft Laboratory, Harvard University

Object number: VT0220

Cruft Laboratory, Harvard University

Object number: VT0204

Cruft Laboratory, Harvard University

Object number: VT0197

Cruft Laboratory, Harvard University

Date: 1921

Object number: VT1021

Cruft Laboratory, Harvard University

Date: 1921

Object number: VT1020

Cruft Laboratory, Harvard University

Object number: VT1549

Cruft Laboratory, Harvard University

Object number: VT0515