D3a RIAA steile Pentode Eventually I came to the Internet search to the pages of Alex Kriegel, of me inter alia. had contacted because of the MTA concept – so to speak as fellow. As the owner of a true tube mountain makes him thieving fun, with exotic sophisticated circuits to design, to measure and test.
Special quality pentode designed for use as wide band amplifier QUICK REFERENCE DATA D3a Life test Low interface resistance Base Heating Heater voltage Heater current Anode current Mutual conductance Equivalent noise resistance DIMENSIONS AND CONNECTIONS Base: Noval December 1968 10000 hours Noval. Gold plated pins Indirect
Pentode tubes were first used in consumer-type radio receivers. A well-known pentode type, the EF50, was designed before the start of World War II, and was extensively used in radar sets and other military electronic equipment. The pentode contributed to the electronic preponderance of the Allies.
Jun 10, 2020 · D3a Spice Model (Pentode & Triode) My latest 300B amplifier brought me again closer to the D3a. I have to say it’s an exceptional driver for this amp as well as it can perform in a phono stage at same excellent level. I took the opportunity to trace again one Siemens D3a NOS boxed as “POS 1.176 Q 31-X 601”.
Normally, a pentode if connected as a triode will have unlinear curves, so they are not made for that. Not so with D3a! Truly amazing, excellent original triode curves are published.
Another example for a small signal frame grid pentode is the legendary Siemens D3a tube. According to Ronald Pit, EF184/6EJ7 used as a pentode will make
1T4/DF91 =remote-cutoff-Pentode= (EIA/6AR-miniature) 1.4VDC/0.05A Ef/If=1.4V/0.05A(direct heat) Epmax=90V Ec2max=90V Ec1max=0V Ikmax=5.5mA op : Ep=90V Ec2=67.5V Ec1=0V Ip=3.5mA Ic2=1.4mA rp=500kΩ gm=0.9mS (参考 : Ep-Ip特性)(pentode @Ec2=67.5V, and triode-connection) also see a similar Japanese subminiature tube w/miniature-base : 15M 1 ...