My P6015 came with an empty bottle. Please contact me at my email about what it would take to get it refilled. go_boating_fast@... location 95630 Thanks,Bob

I wonder if this is the same one that was sold about a year ago with a letter from the actual Maranz engineer? http://sacramento.craigslist.org/ele/3543273337.html

Of course I want two pallets of scopes. I would also like a million dollars so I could buy property and build a warehouse to keep them in. Along with other way out wishfull thinking. On a more pratica

Hard to say. Likely he will hold for a week or two depending on response. Bob

Didn't come up. He wants bulk sales, no piecing out. least hassle. Bob

I just spoke with the seller. He is a former recycler who want to ease back in life ( mid 70's) plus last few years too much hassle in govt surplus. Had 50 trailer loads , now down to 15. Indicated so

Gasp, catch my breath, hold me back. Only 30 min away, but no room or budget. drat. Bob

485 inverter probe OK, I see, it's like probing an SMPS circuit. Although I have an isolation transformer with isolated ground, it won't run 3 scopes simultaneously (The two 485s and the test scope).

Comparing the working 485-1 to the no trace 485 yields a puzzle (Also see related photos in 485 No Trace album). Looking at the waveforms on the collectors of the inverter transistors is strange. The

Similar to Jerry's, I also built a homemade 7xxx extender using old PC ISA parts. Although less than elegant in appearance, it works. Note, I used a rather long hard drive cable. It has too many wires

If your 7603 is good otherwise, HV transformers are available, as Ebay 271043134636. (no connection to me). I got one and will sometime try it. Bob

My purpose in adding a resistor was to limit the inrush current. I believe my problem was a bad HV transformer. Based on symptoms, I think there was a partial short in the output. This could have the

This might help. It is some extensive tests on a 7603 HV I did a few years ago. http://home.comcast.net/~tek-share/site/?/page/Tektronix_7603/&PHPSESSID=a096bf125eb899358c4d218d16fd078d Bob

In the 485 I am working on one of the HV caps has 3 pins. One is tied to a metal shell that looks like a ground shield around the cap. Bob

Steve, Thank you. I am trying to look at the HV oscillator in that 485 I am working on and compare it to the HV Oscillator in the 485-1. The boards are the same. What I see is a square wave with a ver

Oops P6015

Can a P6105 be compensated for a 465M? The manual says use the 100V calibration signal. The 465M label states 1V. My 7904 has a 40V selection. Still not 100V. Suggestions? Bob

In fact discharge the HV pin several times. Not sure what the mechanism is, but I have found sometimes it can build up again even after power off and unplugged. Bob

Found my measurement problem on the three HV diodes. The probe I was using was too large in diameter to fit between the slots on the ceramic mounts. More careful probing yielded better results. The di

Partly answering my own question. Found a reference that states the 485-1 does not have external trigger view (manual page 1-1). (yeah, I know, read the manual. It's just hard to remember everything I