I don't recall mine ever doing that. I'm very sensitive to noise as I investigate anything I can't identify, so I think I would have noticed it. A fan on one of my HP Z400 workstations was doing

YES! I'm the OP for the cited post. My P6201 works perfectly with D and S switched using an MMBF4416 David

Yes, and this is most likely what I will do. But anyway I wanted to hear from people who already went through this. I just find it strange that Tek document has it reversed without any comment or

Is the pinout correct if you install it upside down?

Dear Group, I got a dead P6201 off eBay, and everything points to a defective input FET (probe serial B065531). So I obtained a handful of MMBF4416 (code 151-5025-00 in the service manual, factory

Hi Dennis. This has been tremendous response, my personal views are that this group should be secured for the future, after that I would leave it to your  discretion. Ken Wright    M0KHW

I can try one in a 7603 at some point in the not too distant future. Dave Casey wrote:

Thank you for your assistance. Sure enough, there were 2 screws on the bottom that locked the 177 in place. I never would have known about this locking mechanism without your help. Once I removed

Hi Dave, Fortunately that day is very far off. Dennis Tillman W7PF

Not misremembering, but the rates may have changed again. I checked the rate for first class international, and was expecting that price, but the postal clerk did, and said what I said. -Chuck

Thanks for the data, Dave. I guess the only remaining question in my mind is whether the reset bug ever shows up with a 7L5 in NON-7854 mainframes. Now I have to start chasing the two apparent

They could have killed two birds with one stone if they simply put a "U" shaped pull handle on the front of the porch. Then they would have had a way to remove the porch, and the handle would have

My 11801C does that too. I believe it has a temperature regulated fan, and the feedback loop is kicking the fan motor too hard when it comes on, and then it takes a while for the motor to slow back

Hi Brian, 205 contributions were received. The bill for one year is $110. About $0.53 each would have done it. Dennis Tillman W7PF

Rates changed last year, but I think you are misremembering, because the minimum increment for a package was always much higher than that. Here are current rates for a 4 oz mailpiece sent to Canada

I may make one for mine. I am careful, but the handle is about as exposed as anything can be. I too often wondered why TEK did not have a guard on them from Job#1. Probably would have added 10

I have seen a picture of one. I often thought about making them myself. I have broken off those knobs several times. I am surprised Tek allowed that to be exposed. It begs to be snapped off. The

Hi Craig, Actually the refund process is probably the easiest. PayPal makes it simple to refuse an entire contribution. The museum contacted me to find out if they should send a donation to us. I told

Hi Dave, I always thought it was the early 177s that did not have the knobs to pull it out of the 577. Dennis Tillman W7PF

Hi all, I have some questions about a 11801; - After it has been powered on for a while, 20 minutes or so, the fan starts to make interesting sounds, like if it is revving up one or a few times a