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 Post subject: Jackson 648 and a mess of tubes
PostPosted: Oct Wed 21, 2020 9:24 pm 
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Location: Montreal Quebec Canada
I think I made a good deal? Found a Jackson 648 tube tester in very complete condition. It's the early one with the tube in it. Once it's checked over, it should be a big improvement on my Century tester This guy says they're pretty great testers if you can't afford a Hickok.

https://tubesound.com/rebuild-calibrati ... kson-648a/

Also a mass of many many tubes, everything for $110.00

Not to many older 4 pin tubes, lotsa miniatures and shields. At that price, I'm prepared for many of them being for TV and not suitable for radios, but you gotta throw the dice once in a while. I cleaned up a sample of the larger tubes and would like to know if anyone could tell me if they are mostly TV or Radio.

They are as follows 12BQ6, 5U4GB x3, 6DQ6A 2x3, 5AU4GB, 6F6G,6w6GT, UX201A.

Gary


Attachments:
Jackson 648.jpg
Jackson 648.jpg [ 601.58 KiB | Viewed 441 times ]
tubes 1.jpg
tubes 1.jpg [ 663.68 KiB | Viewed 441 times ]
tubes 2.jpg
tubes 2.jpg [ 660.29 KiB | Viewed 441 times ]

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Last edited by Just one more radio on Oct Thu 22, 2020 5:07 pm, edited 1 time in total.
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 Post subject: Re: Jackson 648 and a mess of tubes
PostPosted: Oct Thu 22, 2020 10:50 am 
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That's a great deal!

The tester alone can easily go for $150+.

And the tubes, I think, another $150+, if you can find some popular ones out of them.


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 Post subject: Re: Jackson 648 and a mess of tubes
PostPosted: Oct Thu 22, 2020 2:12 pm 
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Quote:
They are as follows 12BQ6, 5U4GB x3, 6DQ6A 2x3, 5AU4GB, 6F6G,6w6GT, UX201A.

These are mostly TV except the 201A which is an early tube generally in demand. The 5U4 is a dual diode rectifier used in many things besides TV's.

You can look all of these up in many ways ... google search usually brings up all kinds of info from tube type, to usage, and of course Ebay can give you an idea of price (look up the SOLD listings for this, not asking)

None of this list is uncommon. The 201A is probably the most expensive if you were going to buy them.

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 Post subject: Re: Jackson 648 and a mess of tubes
PostPosted: Oct Thu 22, 2020 3:50 pm 
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The 648 is a great tester in my opinion.
The problem with the early ones is lack of extra filament or heater voltages.
Otherwise socket adapters can be made or sockets added to the tester. Also a shorts sensitivity pot could be added if desired.

Plenty of documentation available in Jim's book.
https://vacuumtubesinc.com/index.php/bo ... anual.html

-Steve

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 Post subject: Re: Jackson 648 and a mess of tubes
PostPosted: Oct Thu 22, 2020 4:06 pm 
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Thanks guys,
Still too new to recognize individual tubes quite yet, but spent last evening sorting out, cleaning and testing the octals late into the night. Did encounter ones that I've used before and many I haven't seen yet. Started to look some up, but the info was incomplete with respect to TV or Radio tube. It usually gave specs, listed equivalents etc and plus it would take forever to check them all. Made a spreadsheet and Quick tested each one and noted the readings.

Today, I'm starting on the miniature tubes. Has to be over 200 of those and will take the better part of the day if my eyesight holds out :roll:
The euro ones (not many) have the worst printing on them and unless I mark down what it was , or better yet, don't clean it. The numbers wipe right off sometimes.

The Jackson tester will need an overhaul as it looks original and the scroll is also binding . Glad to hear that I bought a good tester. Will probably keep the Century for quick tests for now.


Attachments:
sorta sorted.jpg
sorta sorted.jpg [ 436.03 KiB | Viewed 294 times ]

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Last edited by Just one more radio on Oct Thu 22, 2020 5:06 pm, edited 1 time in total.
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 Post subject: Re: Jackson 648 and a mess of tubes
PostPosted: Oct Thu 22, 2020 4:52 pm 
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The 7 and 9 pin tubes are normally called "miniature" tubes.

Peanut is a term usually reserved for the Western Electric 215A which was a 1920s miniature tube. Ive heard people call UV199 tubes as Peanuts but I dont believe that is correct?

-Steve

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 Post subject: Re: Jackson 648 and a mess of tubes
PostPosted: Oct Thu 22, 2020 5:05 pm 
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Thanks for the correction about the tube name. I had read the term (or nickname) peanut tube somewhere and it stuck. Miniatures it is! A day is wasted if you didn't learn anything.

Edited the above posts :lol:

Gary

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 Post subject: Re: Jackson 648 and a mess of tubes
PostPosted: Oct Thu 22, 2020 5:45 pm 
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You may be thinking of an Acorn tube, which there IS. Still in the NUT family, so all's good ;-)

just google 'acorn tube'

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 Post subject: Re: Jackson 648 and a mess of tubes
PostPosted: Oct Thu 22, 2020 6:17 pm 
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4hr's in and my back is giving out! I have learned there are 2 types of miniature tubes, ones that start with 6 and ones that don't. :D . O.K a small bucket for ones that start with 12,35 and 50. Cleaning at the sink, stage one. sorting out the 6's stage two. Testing and pin straightening, Stage three.
I'm using "the paper towel " method used by all the tube sortin' pro's. :lol: Not even close to halfway there. My wife tells me the dining room table is apparently for eating at, so the clock is running.


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tube washin'.jpg
tube washin'.jpg [ 468.41 KiB | Viewed 279 times ]
tube sortin'.jpg
tube sortin'.jpg [ 715.25 KiB | Viewed 279 times ]
more tube sortin'.jpg
more tube sortin'.jpg [ 578.25 KiB | Viewed 279 times ]

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 Post subject: Re: Jackson 648 and a mess of tubes
PostPosted: Oct Thu 22, 2020 6:27 pm 
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I'm sure you figured out the first number is the heater voltage :D

Your 648 does have an Acorn socket, so if you ever find a 955 954 or 956 you can test them.

-Steve

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 Post subject: Re: Jackson 648 and a mess of tubes
PostPosted: Oct Thu 22, 2020 6:37 pm 
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Glad you are learning a lot. I imagine one of the things you are learning is not to buy a bushel basket full of unboxed tubes lol. :)

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 Post subject: Re: Jackson 648 and a mess of tubes
PostPosted: Oct Thu 22, 2020 6:39 pm 
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Yes, I was just having fun :D . I'm following the sequence in the tester guide 6a, 6b etc. as I had to pick a method, so metal tubes, glass etc, all sleeping together. :D

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 Post subject: Re: Jackson 648 and a mess of tubes
PostPosted: Oct Fri 23, 2020 3:37 pm 
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I found this almost empty looking tube among the rest and I thought I would share a pic. No markings left, so no clue what it's from or what it did. It has several fine filaments in it like a light bulb. Hopefully, by the end of the day, I'll be done sorting these tubes that never seem to end.


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 Post subject: Re: Jackson 648 and a mess of tubes
PostPosted: Oct Fri 23, 2020 3:40 pm 
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probably a ballast tube of some sort, for some thing, somewhere, sometime. Ballast tubes were generally used as line regulators.

https://worldradiohistory.com/BOOKSHELF-ARH/Author-Groups/Jacobi/Jacobi-Ballast-Tube-Handbook-opt.pdf

Brief quick description from the above book: "The tubes that we are involved with here are actually three types; Ballast tubes (current regulators), plug in resistors, and a combination of both."

....just to get you interested. ;-)

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 Post subject: Re: Jackson 648 and a mess of tubes
PostPosted: Oct Fri 23, 2020 4:57 pm 
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TubeFan wrote:

And the tubes, I think, another $150+, if you can find some popular ones out of them.

Not really, these are used tubes, not nearly as valuable as NOS tubes. Some are bad from the get-go, notice the ones with the white deposit inside, those have have lost vacuum.
No one knows how much life is left in any of them for sure.
Also testing the tubes before you check out/ refurbish the tester may not be the best approach.

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 Post subject: Re: Jackson 648 and a mess of tubes
PostPosted: Oct Fri 23, 2020 5:09 pm 
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All true, but I'm using the century tester just to weed out the obvious duds. I have no plans to sell them (except the amp ones) and have already used one to fix my RCA 80.
Out of 300+ I have already tossed about 100 with obvious defects. When I have overhauled the Jackson tester, I will be able to check them properly.
I've only been at this a short while and it was a quick way to have a bit of inventory. I'm only in it for the fun! Don't plan to sell any radios anyway.

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