Triplett 3444A tube chart

kgorga

Member
2011-05-23 5:28 pm
I am trying to locate a Tube Chart for the TRIPLETT 3444A. I have found and purchased Manuals but they only have the supplemental data and do not cover the bulk of the standard tubes. I am not sure if the tube model 3444 roll chart is the same as the 3444A solid state model but I can't find that tube chart either.

Any help would be greatly appreciated.
 

kgorga

Member
2011-05-23 5:28 pm
It turns out that what TRIPLETT sent was for the 3444 and not the 3444A and the EBAY listing you showed is also for the 3444. The 3444A is different. It has an addition 60K GM setting so that the "D" switch is off by 1. So the 3444 listing for a RECTIFIER says position 8 when it is position 9 on the 3444A. I can add 1 in my mind but there is more to it. The 3444 has a 200 uA meter and the 3444A has a 50 uA meter. In RECTIFIER and DIODES an EMISSIONS test is done. The 5K BIAS pot is switched in as a meter shunt for the EMISSIONS tests. The same 5K pot is used on both models. I did have a Supplement to the Tube Chart in a manual I bought that had a RECTIFIER listing that was also in the 3444 and the BIAS setting was different for the 2 models. In most cases it was 2X (5Z4 3444 BIAS=15 and 3444A BIAS=30) but not all (81 3444 BIAS=8 and 3444A BIAS=22). Most of the transconductance tests are very close on the settings though.