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SimpleSE Checkout/CL-90 Fail

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wushuliu

wushuliu

Member
Joined 2008
Ok, just went through Ty's(?) photo Checkout and everything was fine until I actually powered the amp to check voltages (No tubes, no speaker load). Then CL-90 inrush limiter smoked and broke in half! :confused:

I am using Antec 350-0-350, SS rectification. What should I check?
 
V

VictoriaGuy

Member
Joined 2008
Sounds like a short somewhere.....

I'd suggest (as I always do, sorry...) taking an hour or so and putting together a light bulb current limiter to help prevent smoking your power transformer. Luckily, the inrush limiter blew this time, but it can get tedious replacing limiters.
What size fuse did you have installed?


I don't have much experience with CL90 and similar, but I think they are supposed to be quite reliable??

BTW, you should have speakers or load resistors on the outputs - you don't want to forget them once you put the power tubes in.
 
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wushuliu

wushuliu

Member
Joined 2008
VictoriaGuy said:
Sounds like a short somewhere.....

I'd suggest (as I always do, sorry...) taking an hour or so and putting together alight bulb current limiter to help prevent smoking your power transformer. Luckily, the inrush limiter blew this time, but it can get tedious replacing limiters.
What size fuse did you have installed?


I don't have much experience with CL90 and similar, but I think they are supposed to be quite reliable??
Click to expand...

Yes, checked the board again and saw that i had not jumpered sw1 for ss rectification. I used a 1.5A fuse... so off to get more fuses, this time 2A (since thats what everyone seems to be using).
 
wushuliu

wushuliu

Member
Joined 2008
spopepro said:
You are using an Antek traffo? They are rated for 115v on the primaries. If you're in an area with highish mains, like I am, you are probably actually getting 380-390 on the secondaries.

...not that I've ever made this mistake with Antek iron.
Click to expand...

Actually 138v on Mains. 420v on secondaries. WTF! : (

And 36v on main filaments :confused:

Also do I jumper or do anything with the 5v tube rectifier connections. Since I am using SS I have them untouched...
 
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wushuliu

wushuliu

Member
Joined 2008
Ok, I've plugged the amp into a voltage regulator, B+ is now 510. 32v at T1 GRN. And the tubes are not lighting up.:(
 

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wushuliu

wushuliu

Member
Joined 2008
rknize said:
Is that an Antek toroid? Can you post the specs on it? It looks to me that you have wired the filament windings in series. This is not what you want. It sounds like your meter is a bit out of whack. 36V on the filaments is not good at all! It's best to check these before putting the tubes in.
Click to expand...

Hi Russ youre right about the dmm, i put in a fresh battery. now reads 497v B+, 119v at primaries after adjusting voltage regulator back to previous setting.

antek specs attached
 

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rknize

rknize

Member
Joined 2009
knizefamily.net/russ/electronics/electron-tube-audio/
OK, you want those 6.3 V windings in parallel. The datasheet shows different colors than the picture on the sheet (and your picture), but they tend to be a bit inconsistent. It *should* be blue-to-blue and green-to-green, but it is easy to figure it out. Just connect two of the same-color wires together and put your meter across the other two. If you measure double the voltage (~12.6), you are putting them in series and not in parallel. If you measure almost nothing, then you already have them in parallel and you can connect the two loose wires together.
 
wushuliu

wushuliu

Member
Joined 2008
rknize said:
OK, you want those 6.3 V windings in parallel. The datasheet shows different colors than the picture on the sheet (and your picture), but they tend to be a bit inconsistent. It *should* be blue-to-blue and green-to-green, but it is easy to figure it out. Just connect two of the same-color wires together and put your meter across the other two. If you measure double the voltage (~12.6), you are putting them in series and not in parallel. If you measure almost nothing, then you already have them in parallel and you can connect the two loose wires together.
Click to expand...

That did it! thanks so much Russ. Only tested one channel, but there was music! B+ at 445v with 6l6s...
 
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