[Hallicrafters] Re: Testing Transmitting Tubes

[Kenneth Ketner]

Since I work with sweep tubes in Swan rigs and similar units, I had 
tried to think up a way to match tubes. I have a Hickok 600A for older 
tubes and a 6000A for later types.

My solution was to take a piece of 1.5 inch clear plastic tubing cut to 
3 inches in length, push a round back 100 ma meter into the top of it, 
with two wires coming out from the meter pins, the meter then 
non-destructively connected in the plate circuit when the tube is tested.

I working on some Galaxy V rigs, I replaced some finals with tubes 
matched closely to the current read by this setup (when the TEST button 
is pushed). The tubes “matched” by this method performed very well in 
the rig.

I have been too lazy to measure the plate voltage put on the tubes 
during this test.

Anyway, could this be a useful matching method?

Merz Donald S wrote:
> A point of clarification, the high-end Hickok tube testers will test many transmitting tubes. 807, 1625, 811A, 6146, 801A, 809, 826, 829 and many others. I have a Hickok 752A and use it all the time for these tubes. I hear that the Hickok 539-series also works. 
> 
> But higher power tubes are more problematic, with plate voltages in the 1000-2500 volt range. For these larger tubes, I just have a sense that there is a creative and easier solution here that I am missing.
> 
> 73, Don Merz, N3RHT
> 
> 
> -----Original Message-----
> From: Merz Donald S 
> Sent: Monday, September 20, 2004 10:20 AM
> To: 'Amradio (E-mail); 'Baswaplist' (E-mail); 'Glowbugs (E-mail)
> Subject: Testing Transmitting Tubes
> 
> 
> Has anyone built a transmitting tube tester? Or seen any plans on the web? The only thing I have seen on this subject is the issue of GE Ham News that covers the subject (Vol 6, #3, May/June, 1951). I have some power supplies I can use to run the static test. But I need to build something to hold the tube sockets, filament transformers and plate current meter. I hate to reinvent the wheel and would be happy to follow a pre-existing design if I could find one...
> 
> Any ideas?
> 
> 73, Don Merz, N3RHT
>  
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-- 

Ken Ketner
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