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 Post subject: Re: Couple of Hickok 600a questions
PostPosted: Mar Sat 28, 2020 12:55 pm 
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cdoyal wrote:
Well, I may have other issues. I measured the plate voltage on the octal socket and got 238v. Should be 150v per the Schoo calibration method. Ugh.


What meter did you measure this with?

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 Post subject: Re: Couple of Hickok 600a questions
PostPosted: Mar Sun 29, 2020 1:44 pm 
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glue_ru wrote:
The inside of the 600a BIAS pot. I happen to have one in the parts bin.

Very cool. I have a request to buy one in the classified section but no bites so far.


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 Post subject: Re: Couple of Hickok 600a questions
PostPosted: Mar Sun 29, 2020 1:45 pm 
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glue_ru wrote:
cdoyal wrote:
Well, I may have other issues. I measured the plate voltage on the octal socket and got 238v. Should be 150v per the Schoo calibration method. Ugh.


What meter did you measure this with?

A modern dmm but I'm trying to scrounge up an old Simpson 260.


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 Post subject: Re: Couple of Hickok 600a questions
PostPosted: Mar Sun 29, 2020 6:55 pm 
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You don't need a different meter. All you need to do is shunt your meter leads with the proper resistance as noted in the calibration instructions.

DM


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 Post subject: Re: Couple of Hickok 600a questions
PostPosted: Apr Fri 03, 2020 4:53 pm 
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Well, I got lucky and found an original pot on ePay. And I paid!
Can any of you helpful folks shoot me a picture of one installed?
I want to make doubly sure I connect it right as I'm not especially good at reading schematics yet.


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 Post subject: Re: Couple of Hickok 600a questions
PostPosted: Apr Fri 03, 2020 11:41 pm 
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My for now junk 600A:
From power XFMR to meter - one brown/white wire, one black wire, two blue wires

My 605A:
From power XFMR to meter - one red/white wire, one black wire, two blue wires

John


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 Post subject: Re: Couple of Hickok 600a questions
PostPosted: Apr Wed 08, 2020 3:14 pm 
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KX5JSC wrote:
My for now junk 600A:
From power XFMR to meter - one brown/white wire, one black wire, two blue wires

My 605A:
From power XFMR to meter - one red/white wire, one black wire, two blue wires

John


Thanks. I got it in and it seems to work fine.
I tested a 6k6 and the meter pegged to the left when I pushed P4.
What's that all about?


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 Post subject: Re: Couple of Hickok 600a questions
PostPosted: Apr Wed 08, 2020 4:04 pm 
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Any chance the meter switch is set to "reverse"?


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 Post subject: Re: Couple of Hickok 600a questions
PostPosted: Apr Wed 08, 2020 5:25 pm 
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J. Hill wrote:
Any chance the meter switch is set to "reverse"?


No it was normal. Another tube tested fine so who knows...


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 Post subject: Re: Couple of Hickok 600a questions
PostPosted: Apr Wed 08, 2020 6:18 pm 
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cdoyal wrote:

Thanks. I got it in and it seems to work fine.
I tested a 6k6 and the meter pegged to the left when I pushed P4.
What's that all about?

Guessing here, but maybe gassy tube or shorted tube ?

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 Post subject: Re: Couple of Hickok 600a questions
PostPosted: Apr Sun 12, 2020 12:24 am 
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you are doing a shorts test FIRST right?

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 Post subject: Re: Couple of Hickok 600a questions
PostPosted: Apr Sun 12, 2020 12:48 am 
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Quote:
Thanks. I got it in and it seems to work fine. I tested a 6k6 and the meter pegged to the left when I pushed P4.
What's that all about?

Just guessing here, but a tube that makes the meter peg like that probably has some defect, most likely a short. If you are skipping the shorts/leakage test before you do the GM test, you risk seriously damaging the meter, the rest of the tube tester, or both.

DO THE SHORTS TEST FIRST. The manual even says so. :). The one time you forget, or get lazy, is the time you blow up your very-difficult-to-get-parts-for vintage tube tester.

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 Post subject: Re: Couple of Hickok 600a questions
PostPosted: Apr Mon 13, 2020 4:22 pm 
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Barry H Bennett wrote:
Quote:
Thanks. I got it in and it seems to work fine. I tested a 6k6 and the meter pegged to the left when I pushed P4.
What's that all about?

Just guessing here, but a tube that makes the meter peg like that probably has some defect, most likely a short. If you are skipping the shorts/leakage test before you do the GM test, you risk seriously damaging the meter, the rest of the tube tester, or both.

DO THE SHORTS TEST FIRST. The manual even says so. :). The one time you forget, or get lazy, is the time you blow up your very-difficult-to-get-parts-for vintage tube tester.


I tested a bunch of other tubes and it only pegs left when the screen is set to 4.
I'm getting a low screen voltage reading on 4. Should be 130 and I get 80.


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 Post subject: Re: Couple of Hickok 600a questions
PostPosted: Apr Mon 13, 2020 8:48 pm 
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huh? Sounds like it's just a bad 6K6 if you tested a bunch of other tubes, and they test OK.

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 Post subject: Re: Couple of Hickok 600a questions
PostPosted: Apr Mon 13, 2020 9:03 pm 
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Barry H Bennett wrote:
huh? Sounds like it's just a bad 6K6 if you tested a bunch of other tubes, and they test OK.


I should have said I tested other types of tubes. Any tube that uses screen setting 4 goes left on the needle.


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 Post subject: Re: Couple of Hickok 600a questions
PostPosted: Apr Mon 13, 2020 9:31 pm 
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Screen setting 4. ...... are you referring to the screen switch? All that does is tell the tube tester which PIN on the socket is connected to the screen. There is no "screen setting" ..... it's the pin assignment for the screen, as selected by the tube chart for every specific tube you are going to test. There's no way a certain screen pin setting would upset anything, unless you're setting the tester up for the wrong tube.

Sorry, not really sure what you're talking about here.

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 Post subject: Re: Couple of Hickok 600a questions
PostPosted: Apr Mon 13, 2020 9:51 pm 
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Barry H Bennett wrote:
Screen setting 4. ...... are you referring to the screen switch? All that does is tell the tube tester which PIN on the socket is connected to the screen.


That is very helpful. If that's the case, then I'll check the connection on the #4 pin on the socket. Why would the needle deflect left when the screen is set to 4?


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 Post subject: Re: Couple of Hickok 600a questions
PostPosted: Apr Wed 15, 2020 3:59 pm 
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cdoyal wrote:
Barry H Bennett wrote:
Quote:
Thanks. I got it in and it seems to work fine. I tested a 6k6 and the meter pegged to the left when I pushed P4.
What's that all about?

Just guessing here, but a tube that makes the meter peg like that probably has some defect, most likely a short. If you are skipping the shorts/leakage test before you do the GM test, you risk seriously damaging the meter, the rest of the tube tester, or both.

DO THE SHORTS TEST FIRST. The manual even says so. :). The one time you forget, or get lazy, is the time you blow up your very-difficult-to-get-parts-for vintage tube tester.


I tested a bunch of other tubes and it only pegs left when the screen is set to 4.
I'm getting a low screen voltage reading on 4. Should be 130 and I get 80.


I started going through all of the resistors and noticed that many had been replaced. My guess is the previous owner was trying some type of workaround to compensate for his non-original bias pot. Now that I have the correct pot, I'll go about replacing the incorrect resistors with the correct ones. I'd love to see a close up photo of the resistors on the back of the push buttons but the only ones I can find using Google have the two tubes in place and they block the view.


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 Post subject: Re: Couple of Hickok 600a questions
PostPosted: Apr Wed 15, 2020 4:44 pm 
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I will open my 600A and try to take some detailed pictures of the area you described, even if I have to pull the tubes. It may be later in the day befor I get to it.

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 Post subject: Re: Couple of Hickok 600a questions
PostPosted: Apr Wed 15, 2020 5:24 pm 
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pauls.ironhorse wrote:
I will open my 600A and try to take some detailed pictures of the area you described, even if I have to pull the tubes. It may be later in the day befor I get to it.

You, sir, are awesome!
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