I bought two 576's from ebay, paid $400 for one, excellent physical condition, just needed new filters. The other was $350, again excellent physical condition, just needed test fixture. Watched on-lin

Bruce & Mike I may have a solution for you guys. I can have the scope and plug-ins picked up from Mike in VA and I will ship the 3B4 plug-in to Bruce for the cost of shipping. Contact me off list if y

I paid $75 for my R556 (rack mount version) a few months ago, with a 1A1 and 1A4 plugin. Chuck

If you go back to the mid 30's the model 908 3" CRT was available in some early scopes. It has a P5 blue phosphor with very fast decay time, advertised for photo applications. I have one in my scope c

Eric, You don't have to remove the CRT to replace/rebuild the PS caps. You need to remove the carry handle assembly, the 2 power supply boards and the CRT wires. You can then reach down and remove the

Oh well, I don't hit ebay that often, so I know I miss things I would love to have. Can't get everything. Depending on where it is, are you interested in selling it? Chuck

What a shame. But that's what happens to most of these vintage pieces, Too Big + Too Old = No Interest I've been lucky on a few early scopes, my best were both from around 1930. A Westinghouse that wa

If you're interested in a copy I can scan my copy and post it on my website. Chuck

I've been looking for one of those for years. Never came across anything other than a couple of ads in some old magazines and I have a 4 page data sheet from 1943. It used a 20AP1 CRT, frequency respo

If anyone is still looking for a 7104, I found one in my storage building. It works well CRT is bright with 7A29, 7A29 opt 4, 7B15, 7B92A. Looked all over for a 7B10 but don't have one. I really don't

Unless it is something ultra rare or I just can't live without, I walk away from getting into a bidding war. If it is a tube scavenger that he's dealing with maybe you can work out something the tube

Jaime, I've been watching that 556 for about 2 weeks and keep hoping someone buys it before did. I really didn't need another one, but for $100 it was getting hard to pass it up. Good luck It's actual

Phil, Just the opposite, the 5AR4 is the magical rectifier that makes a golden ear amplifier come alive. The 5V4 is the TV damper tube that is only of interest to antique TV collectors. I've used it i

Jamie, You can replace the audiophool gold standard tube (6DJ8) with a common 6BK7A. It's a TV tube so very little demand for them. Gain is a little higher and transconductance is a little lower but i

Sean, I presently have thirty 500 series scopes that are restored or what I call "good enough to restore someday" and a few more that were bought as donors. I've had good luck on CL and private ads. T

I recently pulled one of my 555's out of storage to get it working and warm up my shop. I checked all the electrolytic caps with an ESR meter first to weed out any that were obviously open or shorted,

You could try one of these solutions to change the lamp color: T-3 1/4 lamp filter, fits over the glass bulb from Mouser Electronics Red filter #560-39121A Also come in Orange, Yellow, Green, Blue Tra

You could try one of the DC-DC HV converters like EMCO E-Series units. The E50 will deliver +/- 5KV at .6ma with 15VDC in. I've used them to replace the RF oscillator HV supplies in early electrostati

I bought one of the Chinese programmable loads, what is called a 3700 series. They show up with various names mine was an Array 3710A. Input voltage up to 360V, current up to 30A, power up to 150W, th

Velik, Thanks for the info, I'll try it when my replacement caps arrive. Chuck