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Probably because the lamps are cheap, easily available, and a lot less work. Dale H. Cook, GR/HP/Tek Collector, Roanoke/Lynchburg, VA http://plymouthcolony.net/starcity/radios/index.html

I agree with Ed's diagnosis. The push button switches seem to be particularly vulnerable, and are a bear to get to in order to squirt something like Deoxit into. I took all the four main boards out,

Okay looks like you're right. I guess some pins float that shouldn't when the switch doesn't make contact, causing odd behavior.

T’would be an easy proposition... if I need to replace one in my 453, that’s what I will do. Phil, N6OMM

I should say that I don't see the same behavior on the gates of Q531A/B, Q631A/B... I just see the switches being a bit flakey. I only see the exponential convergence on the source pins of these JFETs

You have likely already found the problem - it's poor contact in the switches. Try working them through all their states a lot (may take up to about a hundred times) and see if it settles down. Also

Hey all, I'm trying to restore a 576 curve tracer. When I turn it on, the trace will go off screen... usually I'm able to move the trace back on screen using the position dials. However, when pressing

Pardon me if this is a dumb question, but why is there no interest in replacing the bulb with LED? --Toby

Hi Fabio, Very nice idea and good documentation on how to do it. You didn't say what if anything you put over the label to protect it after you transferred it to the button. Dennis Tillman W7PF

I've used the cold transfer method - it works a lot better than heat transfer for transferring images. There are many youtube videos on the method. The process can be used on just about any medium -

Hello guys, I wasn't sure if I should post it as an answer to a previous topic on this previously discussed subject, or if I should start a new one... And since this is not a question, but an

Hi all. I will keep this short. Please respond to me off list. I am looking for two feet 5060-0767 and tilt stand feet 1490-0030. I’ve searched on the inter web to no avail... if there is someone

Dave, Just ask any married man although not in the presence of his better half!! Jack

Hello Edward, Thanks for the update, and for the kind words... I think I was just in a good day. In your case, I confess, when I jumped in I was believing the problem could be related to the ROM, only

Thank you to everyone that took the time to reply to my message. I had no idea that the bulb was in a bulb holder! I should have looked closer. Thanks once again! 73 de N1FBZ

Definitely Obtainium. Available at Mouser and Digikey for a dollar or two, and at BulbTown for fifty cents. Dave Wise ________________________________________ Sent: Monday, June 18, 2018 12:14 PM To:

It is perfectly acceptable to have unexpressed thoughts. Dave Wise ________________________________________ Sent: Monday, June 18, 2018 11:25 AM To: [email protected] Subject: Re: [TekScopes] Self

Hi Keith, I understand your decision. Still one remark. I sold my 465 because I have a 100 MHz 2232 now. The 2232 can be used as fully analog 'scope *and* as a fully digital 'scope. I like it very

Hello Folks, Given that even some contributors who I respect a lot seem to squabble about where to buy parts for the 2xxx series the best way, please allow me to suggest a source Dorit and I have used

The 1982 CDPC shows it as a number 685, aka CM685 (5V, .06A, .05MSCP, 25k hours). It is available from Mouser, Digikey and many others. Dale H. Cook, GR/HP/Tek Collector, Roanoke/Lynchburg, VA