Robert Podboy Posted June 11, 2021 Share Posted June 11, 2021 What early C-130 systems had vacuum tubes? Quote Link to comment Share on other sites More sharing options...
hlg6016 Posted June 11, 2021 Share Posted June 11, 2021 (edited) KC 130 F (B Models) had tubes in just about everything in the under deck rack. Edited June 11, 2021 by hlg6016 spelling and grammer Quote Link to comment Share on other sites More sharing options...
Anderson00791 Posted June 11, 2021 Share Posted June 11, 2021 I can remember the APN 59 Radar System (I think the photo is theRT 289) , the ARN 6 ADF System , the VOR system , and the APN 70 LORAN System off the top of my head. Can’t recall if the ARN 21 Tacan System was tube based. I believe most of the Autopilot , Doppler , and Radio Systems were tube based until they were upgraded to solid state or digital components Quote Link to comment Share on other sites More sharing options...
Jcapsparkchaser Posted June 12, 2021 Share Posted June 12, 2021 We had at one time 10 "E" models starting with serial # 637776, we also had 2 -"E" 621809 I think was 1 of them anyway The E-4 Autopilot Amplifier was tubed and on long flights the crew would have to shut down the A/P because of tubes overheating and the axis's would spike, rolls, porpusing, etc etc. In 1991 after returning from desert mod teams came in and Satcom and GPS, along with NEW Autopilot which was all digital was installed in our Heres. We were lucky because back in the 80s all our Hercs had the wings and wing boxes replaced which extended their life. In 2005 Pope, Little Rock, and Dyess came up and took them all away as a result of the wing box inspection at these bases where non repairable cracks were found. CRS runs thru my brain at times . The inspection came about after the C-130A belonging to Coulson fighting fires in California crashed killing all 3 on board as the wings folded back after the aircraft pulled up after dispening its retardant. Quote Link to comment Share on other sites More sharing options...
NATOPS1 Posted July 23, 2021 Share Posted July 23, 2021 On 6/11/2021 at 6:27 AM, Robert Podboy said: What early C-130 systems had vacuum tubes? Nice APN-59 Barrel!! Replacing that freekin thing SUKED!!! Replacing the cannonplug SUKED MORE!!!! Quote Link to comment Share on other sites More sharing options...
n1dp Posted July 24, 2021 Share Posted July 24, 2021 The blessed propeller synchrophaser. Quote Link to comment Share on other sites More sharing options...
tinyclark Posted July 28, 2021 Share Posted July 28, 2021 Anderson pretty much covered everything. Therer are still ARN6 ADF systems on some H models as far as I know, but I've been retired for 10 years. I probably repaired close to a thousand RT-289s in my career. Early on after training on them, I started replacing the TR and ATR tubes on every one, as well as the PFN if it looked the slightest bit swelled. Our MTBF went up quite a bit. Quote Link to comment Share on other sites More sharing options...
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