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575 556? I would love to have a 556. They are both massive double beam machines but there are quite a few differences. The 556 is in one piece while the 555 is quite a bit larger and has a separate

output amplifier. First thing to check is the collector load resistors that of gain Dean, thanks for your quick response. I m not sure which collector load re

Bill, Don't play with the gain. Both channels are affected the same way, and that pretty much says that the problem is in the vertical output amplifier. First thing to check is the collector load

Hello, I just discovered this group and look forward to participating. Right now I can use some technical help, though. I am wrestling with a TEK 465 in the 32xxx serial # range that seems to work

Hello, I just found out about this group and decided to join. I've got an interesting collection of Tek scopes and other stuff, consisting of three RM561As, a 551, a 181A time mark generator, a 106

Do you know how the 555 differs from that other monster, the 556? Please tell us something about your spectrum analyzer! At least 2 of us here have 549/1A4 combos! Yes, a nice piece of

When I recently joined this group, I read alot of the old posts. I saw in one the mention that Freon-TF, used to clean fans, wasn't available anymore. Where I work, they use something called

Welcome aboard, Morris. I'm just a novice collector, and only have one scope (a late 535A, Scopemobile, and a few plugins). But, it's in almost mint condition and I have all the probes, cords, and

I'm very pleased to have found this group as I am a great lover and collector of vacuum tube Tek scopes here in Melbourne Australia. My collection includes examples of the 310A, 502, 524AD, 529,

Don't forget to monitor eBay! ----------------------------------------------------------------- Michael Dunn | Surround Sound Decoder & Stereo Enhancer Cantares | Self-Amplified

You may also want to look at www.big-list.com under "manual dealers". I have had good luck finding manuals from several entries in this list. Jim

Hi Doug, I doubt you could get that manual from Tek at any price these days. Anyway, if you go to the following URL, you can find a list of companies and people who can supply you with copies of Tek

Try this one. Bill http://used-line.com/cgi-bin/manuals/manuals.cfm Doug wrote: [E*TRADE. It's your money]

Hi, my name is Doug and I am looking for a User Manual and Service manual for a Tek 454 Scope. I had seen a source on the web but can't seem to find it now. Does anyone know were I might find

Hi All My old faithful 7904 has started to have a little problem with the display. It will run for hours or days with no problem. Then it will start to drift the display up and down, this is the

Eventually I have got it! The entire story is reported at http://space.tin.it/clubnet/egirland/tek475/vpots/vpots.html I want to thank you once again the group for the support and in particular Mr.

Hi Michael, Thanks for the rundown on the 7S14/5S14. I knew the 5S has come before the 7S and that they had similar specifications, but since I have never seen a 7S version, I did not know they were

Yep. That's just what I needed. Thanks much! -- John Rehwinkel

I need someone to refresh my memory. The old Tek scopes with the separate power supplies (555 and similar) had an unusual filament voltage regulator that operated with a saturable core reactor.

Hi, there is a 6CZ5 and a 2AS-15 in the regulation loop of the Tek 555 heater supply voltage. The 2AS-15 is probably the one you mean. Quoting from the 555 manual: 'The circuit operates by