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| | |-+  How much glow from the ef86 should you see compared to the other tubes??		 « previous next »
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Author Topic: How much glow from the ef86 should you see compared to the other tubes??  (Read 3928 times)
telemad
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« on: July 23, 2009, 04:56:26 PM »
With my channel 2 problem I am chasing down it appears that not much glow comes from that tube (ef86) all others appear to have more going on in the tube. Is this an ef86 trait or does it sound like a bad tube?? anyway to test the tube without a tube tester since I don't own one?? I get sound but only when channel 2's volume is all the way at zero.... would I get any sound if the tube was bad?? the tube shouldn't be creating the volume only works at zero issue right??? When using the shielded wire nik supplies with the kit does the braided shield need to be pig tailed to ground or just solder the core wire to the tabs stated on the layout... As I stated in a previous post all wires match the layout and all have continuity.... I'm CONFUSED
thanks
« Last Edit: July 23, 2009, 06:30:21 PM by telemad » Logged
Mitch
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« Reply #1 on: July 23, 2009, 07:39:02 PM »
Very hard without seeing the circuit to deduce what the issue is- if your getting sound when the pot is at zero sounds like you've wired the send/return in reverse (possibly) or you've got a short somewhere.  re-check your connections- the send /return screened cables should have the screen wired to earth at ONE end only- usually with some heat shrink to keep things tidy.  On my DC30 channel 1 is the EF86 channels send/return (mine was wired up by Nik) is yours the same?  Have you tried replacing the EF86?
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telemad
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« Reply #2 on: July 24, 2009, 01:00:02 AM »
Quote from: Mitch on July 23, 2009, 07:39:02 PM
Very hard without seeing the circuit to deduce what the issue is- if your getting sound when the pot is at zero sounds like you've wired the send/return in reverse (possibly) or you've got a short somewhere.  re-check your connections- the send /return screened cables should have the screen wired to earth at ONE end only- usually with some heat shrink to keep things tidy.  On my DC30 channel 1 is the EF86 channels send/return (mine was wired up by Nik) is yours the same?  Have you tried replacing the EF86?

I rewired the send/returns and now have the ch. 2 volume working proper through it's range.... Still have some hum to chase down and am not getting the level of volume I should out of ch. 2 .... I am thinking the lack of volume might be a bad ef86 bought off ebay.. ??

I built this from a kit it's my second build so I have a lot to learn about electronics ...Also, when plugged into channel 2 does your ch. 1 volume knob when turned affect the volume level of ch. 2???
« Last Edit: July 24, 2009, 01:02:14 AM by telemad » Logged
hywelg
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« Reply #3 on: July 24, 2009, 08:17:35 AM »
Quote from: telemad on July 24, 2009, 01:00:02 AM
...Also, when plugged into channel 2 does your ch. 1 volume knob when turned affect the volume level of ch. 2???

No it shouldn't do that. You've got your wiring wrong somewhere, check the input jacks first, then follow the signal path.
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