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 Post subject: WTB: Knobs, etc., for Tektronix Plugins
PostPosted: May Sat 21, 2022 3:38 am 
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What I am looking for folks, is the small red knobs used on a variety of Tek plugins. In this case, they are needed for a 3A74 amplifier (in photo). These knobs are approximately 3/8" to 7/16" long, and 7/16" in diameter at the small end. The hole is 1/8". Additionally, I need the locking/clamping assembly found on the 2 and 3 series plugins. Need the entire assembly. In both cases, could use at least a couple of each, the knobs and locking assemblies.

Thank you guys and gals, much appreciated.


Attachments:
3A74.jpg
3A74.jpg [ 3.31 MiB | Viewed 535 times ]

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 Post subject: Re: WTB: Knobs, etc., for Tektronix Plugins
PostPosted: May Sat 21, 2022 11:50 am 
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You’ll probably have a way better chance at just getting a scrap plug in. They show up at auctions, hamgests, shows, the occasional estate sale and of course the bay

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 Post subject: Re: WTB: Knobs, etc., for Tektronix Plugins
PostPosted: May Sat 21, 2022 11:52 am 
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Not that hard to come by. PM sent.


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 Post subject: Re: WTB: Knobs, etc., for Tektronix Plugins
PostPosted: May Sat 21, 2022 7:11 pm 
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Barry H Bennett wrote:
You’ll probably have a way better chance at just getting a scrap plug in. They show up at auctions, hamgests, shows, the occasional estate sale and of course the bay


Looked at some of the junk on the 'bay, but I am reluctant to drop $50 or $75 for a scrap plugin. Call me cheap, but the likelihood of getting enough goody out of those units to make it worthwhile in my lifetime is about nil. There may still be the occasional decent deal, but I haven't ran across one for some time.

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 Post subject: Re: WTB: Knobs, etc., for Tektronix Plugins
PostPosted: May Sat 21, 2022 7:21 pm 
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Last time I was at Fair Radio in Lima, Ohio he had dozens of plugins on a shelf, and more than likely has extra knobs in a separate bin which were saved from other scopes that were parted out over the years.

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 Post subject: Re: WTB: Knobs, etc., for Tektronix Plugins
PostPosted: May Sat 21, 2022 9:37 pm 
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Forgot about Fair Radio. Bought some stuff from them years ago. Will give them a call. Didn't see anything on their website. Thanks Dennis.

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 Post subject: Re: WTB: Knobs, etc., for Tektronix Plugins
PostPosted: May Sun 22, 2022 3:16 am 
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Google "Qservice". They have a category just for Tektronix knobs.

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 Post subject: Re: WTB: Knobs, etc., for Tektronix Plugins
PostPosted: May Sun 22, 2022 5:05 am 
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Location: Manalapan, NJ
I have following knobs.
Please let me know if interested:
This are from more "modern" Tek, but may work...


Thank you,
Aram.


Attachments:
20220514_224735.jpg
20220514_224735.jpg [ 263.88 KiB | Viewed 421 times ]
20220521_233005.jpg
20220521_233005.jpg [ 265.19 KiB | Viewed 421 times ]
20220521_232951.jpg
20220521_232951.jpg [ 284.38 KiB | Viewed 421 times ]
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 Post subject: Re: WTB: Knobs, etc., for Tektronix Plugins
PostPosted: May Sun 22, 2022 3:38 pm 
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Thank you Aram, but I'll pass. In the interim, I have swiped a knob from my 3T77 Sampling Sweep generator. Hate taking parts from instruments in the repair queue, but since I intend to use the 2A74 as my regular amplifier in the 561A (at least for awhile), the knob will at least make the plugin "whole" since it now joins the ranks of the living.

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 Post subject: Re: WTB: Knobs, etc., for Tektronix Plugins
PostPosted: May Sun 22, 2022 7:01 pm 
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I have quite a few Tek knobs, don't know about that size, since I'm not at home right now - will be a week. There's a bag of 1/8" shaft knobs. The locking mechanism is threaded rod, aluminum knob, c-clip? May have that too.

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 Post subject: Re: WTB: Knobs, etc., for Tektronix Plugins
PostPosted: May Sun 22, 2022 9:28 pm 
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Tom Bavis wrote:
I have quite a few Tek knobs, don't know about that size, since I'm not at home right now - will be a week. There's a bag of 1/8" shaft knobs. The locking mechanism is threaded rod, aluminum knob, c-clip? May have that too.


Great Tom. Not in a big hurry. Would just like to put all the parts I pulled from my other plugins back, and have a few spares.

The locking mechanism contains the knob, threaded shaft, housing/bracket, locking finger, tension spring, and the keeper. The "keeper" is an "X" shaped affair. To remove the keeper from the threaded shaft, you have to squeeze two of the legs together to open up the legs that are on the end of the shaft. A bit of a bear.

I don't really need the housing/bracket, but could use the rest of the parts. Could also use a couple of the nylon/plastic guide feet that are on the bottom of the back plate of the 560-Series plugins. Had to swipe one of those too.

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 Post subject: Re: WTB: Knobs, etc., for Tektronix Plugins
PostPosted: May Tue 24, 2022 10:54 am 
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Location: Scranton PA. 18505
Found 3 so far.

Attachment:
20220523_185948.jpg
20220523_185948.jpg [ 703.64 KiB | Viewed 329 times ]


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 Post subject: Re: WTB: Knobs, etc., for Tektronix Plugins
PostPosted: Jun Fri 03, 2022 5:24 pm 
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Joined: Jan Thu 01, 1970 1:00 am
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Location: Rochester NY USA
I pulled these from the bag of Tek knobs - four (needing cleanup...) have a 3/16" shaft, 0.56" dia., 0.54" long. Rest are 1/8": - two 0.5" dia x 7/16", one 7/16" dia x 0.5" long., may have more of all of them. Don't have the locking parts except for the knob - 3/16"?

Attachment:
tek_knobs.jpg
tek_knobs.jpg [ 175.06 KiB | Viewed 181 times ]

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