Products > Test Equipment
Do you have any test equipment in your lab that uses vacuum tubes?
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MarkL:

--- Quote from: med6753 on September 14, 2019, 06:57:01 pm ---
--- Quote from: MarkL on September 14, 2019, 02:49:59 pm ---
Close - They're 1G3.

I guess they needed more plate current than the 1B3.  Difficult to tell them apart by looking at the internal structure.  1G3 is a sub for 1B3.

--- End quote ---

According to the RCA Receiving Tube Manual 1G3/1B3 are identical....no difference in characteristics.

--- End quote ---
Interesting.  I was looking here:

  http://tubedata.milbert.com/sheets14.html

Some of the data sheets do show them to have the same ratings.  Some don't.

I also have a copy of the RCA Receiving Tube Manual.  One thing that's different is that the 1G3 has a slightly smaller height (3+9/16" vs. 4+1/16").

My sub book shows 1G3 as a sub for 1B3, but not the other way around.
n5al:
Apart from CRTs and VFDs, none of my test equipment uses vacuum tubes.  I have a HF linear amplifier that uses 3-500 tubes, but that's not test equipment, of course.
zitt:
Hikok 605A Tube Tester - missing main needle meter.



I'd like to get this tester working so I can resurrect my Grandma's AM Radio from 1930s which is also a vacuum tubes.
Martin.M:

--- Quote from: Cubdriver on September 10, 2019, 02:02:49 am ---A triple nickel is on my wants list.  Even more beautiful with the P11 phosphor! 

--- End quote ---

hello Pat,
look for a P7 dual coating screen, they have a fast blue and a slowly greenyellow, so when the dot is slowly running its blue and draws a grennyellow line.
That is the most cute CRT Tek have build. P7 is very useful for slowly frequencys about the very long delay of the greenyellow. In fast actions it looks blue only.
The delay time of the greenyellow will reach 2 seconds, the blue have only ms

Martin

Picture = Triple Nickel, P7
the second picture is a 551 Dual Beam,with options  P11 and 12kV mod (= another graticules glass, with a text below)
Cubdriver:
Beautiful scopes, Martin - you have an awesome collection of them!  I'm keeping my eyes open, but I fear like many of the heavy old Tek iron that they're getting more and more rare as audiophools gut them for their dual triodes and discard the carcasses.  That really burns me up!

Keep up your preservation efforts!!

-Pat

Edit to add - thanks for the tip on the P7 dual phosphor - I'd read about it, but never gave it much thought - it looks like a great combination!
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