One of the rarest dual triodes you will ever encounter – the Standard Sweden 33S29A was produced in very small quantities for the Swedish military and virtually never surfaces in testable condition. Both sections test close to nominal.
1 x Swedish STANDARD 33S29A 6SL7GT 5691 Test above Low Dual Triode Vacuum Tube
Tube Type: 33S29A – Dual Triode (6SL7GT equivalent). Etched Codes: 33S29A / SVENSK. / OX139 (noted as-is). 33S29A = 6SL7GT = 6SL7 = CV1985 = VT-229. The 33S29A is the Swedish military designation for the 6SL7GT dual triode.