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Thanks! Nice, clean layouts on those panels. Mark

Change the 125 volt plate supply on the switch to 12 volts. Leave the screen open, it's not needed. Just put a pair of RF N-Ch e-mode fets to the plate, grid, and cathode and tune away. Pick a fet

I was able to repair a problem like that once by using the HV supply from an old 13" color TV. I was careful to position the CRT so that the detached strap would fall in the right direction when it

I should have linked this in my original post. Here is a cleaned up copy of the 184 schematics that I made when I printed them out. The tetrodes are all on schematic 1:

Bob, My Q1216/Q1218 are overheating. Looking at the Diagram from your website, the 15.7 ohm resistor was added to the Q1216/Q1218 loop. I am in "first grade" electronics, lacking some elementary

reason for posting,, Does anyone know of anybody whou would care to own this cube roughly ?25 lbs? weight Cube seems to be rather old/ Apologies,,,for off topic. You guys are the smartest that I know/

BLACK BODY;FOR-SALE DIMENSIONS 8 INCH 7 1/2 8.5 aLL INCHES ser1al 415 Model 1945 ---------------- More info part no.82198 F311006-4 contr no F34601-71C3333 MFG 8255 Hughs Aircraft USA

It's probably best to use at least the same type of transistor in both spots - they don't need to be matched closely, but may cause problems if way different. Also, when one is shot, it's possible the

I'm not familiar with the 184, but it seems that for a 500 MHz type circuit, it's low-Z RF anyway, so you could probably design in some bipolar transistor circuits to replace the tubes, with new bias

On my 2246 ModA, I first thought that both inverter switching transistors Q 2009 and Q 2010 are fried, but it looks like one is fine after I removed the obviously shorted device. Since I am using an

HSMS-2822 diode (currently installed) versus mini circuit's zx05-83lh-s+.

I posted a few months ago on this scope. I was not able to get this resolved at the time and got busy on other projects. I want to take a fresh look at it now. Here is an example of what I am seeing.

Take a look at the edited pic I uploaded. A 1/8 gap most likely can't be cured. This is definitely a warranty repair :).

I've never heard of FrontDesigner, but "Front Panel Designer" is free from www.frontpanelexpress.com. It's pretty nice. It's intended as a front end to their proprietary panel-fabrication service,

I have a mostly functional Tektronix 184 Time-Mark Generator that I am restoring. It has six 7587 nuvistor tetrodes and they all appear to work except for maybe the pair in the 500 MHz multiplier. You

Tom, I've put a new photo up called "Gap" in the SC503 CRT folder, with a red circle around the pin and strap. It's definitely not support for a glass rod. Pin 14's strap is definitely attached to the

Can you put a circle around where you think it is open? The strap just appears to be a support for the glass rod. Do you have any kind of a HV spark generator that you could connect across the heater

Oh yes, the disposable flash cameras will make 350 volts from one or two AA batteries. Good thought. You get the free capacitor also.

Before I go and do all that, would you guys look at the photos I just put up of the pin and strap, and see if you think it's even possible? To me, the gap between the pin and the strap is a little bit

There is another TO-3 in the HV/Z-Axis, at least there was with the OS254P/U (military version). I do know the Z axis is different to the civilian version, so maybe the transistor is not there, but I