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I would agree - your MK1 Eyeball Tube Tester has told you all you need to know!

Richard, Regarding your need for a EL86/6CW5 tube for your HP200CD project. Antique Electronics currently lists New Old Stock EL86/6CW5 tubes for $6.90 each. Reference the page at

Where are you located? I may have one but I'm near Denver and won't ship it. If you are close enough I'll check on it. Leonard

EL86 and 6CW5 are exact equivalents – they are just two different numbering systems (American vs European I think). And they are readily available on eBay for around $10 or so including

Purple pink is likely caused by the excess gas in the tube ionizing.? Unless it's a mercury vapor tube (don't think it's likely), soot and burn marks (not a getter flash) is not a good thing to

Evidently the markings on capacitors may not always be correct. Interesting video from Mr. Carlson’s Lab. https://youtu.be/BnR_DLd1PDI George

Alan? Thanks for your thoughts on this problem. I had found the excellent article on xDevs in the past , but I have now downloaded it again as its been enhanced. I had not checked if Keysight wold

gassy tube no good.

Hi, Can you determine how the electrodes are fixed into the outer case? I understand that there's one electrode on each side. The electrodes must be electrically isolated from the main body, so I

I would have thought so if they are alternative valves (the casing is marked for both?) You’ll probably need to recalibrate after that but it ought to make it work a little better

Thanks Nigel, can I mix an EL86 and 6CW5 in the one unit ?

Think you can count the one on the left of the image as failed – looks like it is arcing internally. Suggest you try a replacement first. Regards Nigel Sent: 27 October 2021 12:54 To:

Actually it rises to about -50V when I let things warm up. I am thinking it may be one of the EL86 tubes. I was assuming warmth meant it was probably glowing but now I have taken the shields off I

Outside foil connection may be even more important in scopes and other test gear because of often lower signal levels being measured, and the scope containing sweep and power supply circuits that

*Thank you all for the info,* I will order one since building one would cost as much and I would not have as nice a case....HA I repaired my 4271B I bought for $20 at a hamfest and all it really

I get < -1V across R40... A bit less than the -200V expected :)

Hi Xu OK about when you joined I believe the issues regarding the Copy right issues with HP was dealt with before I and most changed to this group IO in 2005 from the previews group ( I believe

From: byterock@... <mailto:byterock@...?subject=Re:%20Re-capping%20an%20HP-130%20Scopes> Date: Tue, 26 Oct 2021 10:56:58 PDT Just a general general questions on replacing the paper

All of the knock-off fixtures I've tried have the same BNC spacing as the HPs. Dave Casey [email protected]> wrote:

I think the bnc spacing was common across the range of instruments to allow maximum flexibility/use of the test heads - looks the same on my 4275 and 4192 we have at work. Regards Nigel Sent from my