LBI 4593 has the PA Xistor torque spec of 8 Inch-pounds for the older style 100 watt PA Xistors. It is located under the maintenance portion of the PA Assembly (buried in the last paragraph). The list here for various size nuts is good information to have on hand. Fred W5VAY ----- Original Message ----- From: Nate Duehr To: [email protected] Sent: Monday, July 16, 2007 7:10 PM Subject: Re: [Repeater-Builder] "old style" GE MASTR II VHF PA - transistor torque specifications
Butch Kanvick wrote: > Hi, Nate. > > I have a VHF PA sitting next to me and the sticker says: > > CAUTION > Tightening Torgues For Transistor Hardware > Must Be Adhered To > > 6 +- in/lbs for 4-40 hdw > 8 +- in/lbs for 8-32 hdw > 12 +-in/lbs for 10-32 hdw > > I have not seen it in the LBI's either. > > Butch, KE7FEL/r Thanks for the info, Butch. Yeah, that's the sticker on the newer-style ones. I have a couple here with that sticker on them too. I received this info off-list from a good source about the older ones: For a 1/4" stud use 5 +/-1 inch-pounds. For a 3/8" stud use 8 +/- 1 inch-pounds. For a 1/2" stud use 10 +/- 1 inch-pounds. Not much different, really...but not as tight as the newer ones. The smaller transistors must break easier, if I had to guess why they're lower. I thought I'd share in case anyone else is watching the thread for replies. 73, Nate WY0X
