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 Post subject: Trying to test 6sk7 in Knight 600C
PostPosted: Oct Mon 19, 2020 1:05 am 
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Joined: Oct Sun 11, 2020 7:40 pm
Posts: 42
Location: Guthrie, OK USA
I tried to test a 6sk7 in my Knight 600C. I noticed it didn't even get warm and completely failed. Got to poking around and noticed the heater voltage is missing from pins 2 and 7.

I wonder if my tester is wired wrong!

Thoughts?


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 Post subject: Re: Trying to test 6sk7 in Knight 600C
PostPosted: Oct Mon 19, 2020 1:12 am 
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Joined: Jan Tue 10, 2012 8:39 am
Posts: 1797
Either that, or a bad connection or a burned out transformer or a dirty switch.


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 Post subject: Re: Trying to test 6sk7 in Knight 600C
PostPosted: Oct Mon 19, 2020 1:12 am 
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Joined: Nov Wed 30, 2016 7:35 pm
Posts: 8458
Location: Sunbury, Ohio 43074
Wired wrong, or a dirty switch, broken switch, or broken wire. Or a bad tube socket.

See if you can get the assembly manual and trace it through step by step. Some of these kits were never wired right, but I'd think in this case something has possibly gone wrong later on.

Heater voltage should be fairly easy to trace through the circuit with just a simple voltmeter. You can tell where it's gone astray. But it is MUCH easier with the manual unless you have an extreme amount of experience with tube tester troubleshooting.

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 Post subject: Re: Trying to test 6sk7 in Knight 600C
PostPosted: Oct Mon 19, 2020 2:15 am 
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Joined: Oct Sun 11, 2020 7:40 pm
Posts: 42
Location: Guthrie, OK USA
Thanks Bob and Barry. I'll tackle it when I'm fresh. I have the original assembly instructions.


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 Post subject: Re: Trying to test 6sk7 in Knight 600C
PostPosted: Oct Mon 19, 2020 3:39 am 
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Joined: Jun Sat 15, 2019 7:43 pm
Posts: 1002
If you set it up for a 6V6 do you have voltage on pins 2 and 7? can you test a 6V6 properly?

DM


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 Post subject: Re: Trying to test 6sk7 in Knight 600C
PostPosted: Oct Mon 19, 2020 7:14 am 
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Joined: Dec Sat 28, 2019 4:18 pm
Posts: 486
Location: Corinth, TX
For a quick sanity check, set up for the 7 pin 6AQ5.

No filament voltage, probably the transformer or the filament switch. If you do have fil. power, probably the octal socket.
Edit: Check on pins 3 & 4.

John


Last edited by KX5JSC on Oct Mon 19, 2020 6:03 pm, edited 1 time in total.

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 Post subject: Re: Trying to test 6sk7 in Knight 600C
PostPosted: Oct Mon 19, 2020 2:11 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 4970
Location: Rochester NY USA
I had a bad heater switch in my 600C - wiper came off inside. But I found a replacement on eBay - same Mallory part number.

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 Post subject: Re: Trying to test 6sk7 in Knight 600C
PostPosted: Oct Tue 20, 2020 1:32 am 
Member

Joined: Oct Sun 11, 2020 7:40 pm
Posts: 42
Location: Guthrie, OK USA
Thanks all. I adjusted a filament switch contact and applied Deoxit to all of the filament switch contacts. Works fine now! Tested all of the tubes in my new project. Admiral Continental Model 55 A7.


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