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Tubelab Discussion and support of Tubelab products, prototypes and experiments

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Old 16th June 2014, 12:57 PM   #11
moggi1964 is offline moggi1964  England
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Have two 10M45's and two R16's coming (best to be sure, right!) and just bought a new pair of 5842's on the bay.

The old CCS is proving a pig to remove, I think I need a second set of hands so will attempt that tonight.

Thanks JP
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Old 16th June 2014, 02:01 PM   #12
jan.didden is offline jan.didden  Europe
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Just cut it off and remove the stumps one by one...
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Old 16th June 2014, 03:04 PM   #13
moggi1964 is offline moggi1964  England
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Now why didn't I think of that!

Thanks Jan, saved me a bunch of time and frustration.
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Old 17th June 2014, 03:21 PM   #14
moggi1964 is offline moggi1964  England
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So I discovered that some solder had run down one of the legs (picture soldering underneath with the CCS hanging upsidedown) and had managed to form a bridge between two legs (too much solder I guess).

Won't make that mistake again.....hopefully!
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Old 17th June 2014, 03:43 PM   #15
jan.didden is offline jan.didden  Europe
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Quote:
Originally Posted by moggi1964 View Post
Won't make that mistake again.....hopefully!
Ohh but you will - I've done if more than I like to admit.
But then you develop a habit to look for that sort of thing first

Most diy-ers transition from 'that part must be broken' to 'what could I have possibly have done wrong here' within a couple of years

Jan
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Old 25th June 2014, 10:41 PM   #16
moggi1964 is offline moggi1964  England
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LOL

Well the parts are replaced but now I am getting weird numbers from B+ and B- and they are on runaway.

I need to spend some time checking through the changes I made and then I'll start a new thread if I cannot resolve the issues. Be a couple of weeks though before I can get to it.

Thanks for all your help everyone.
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Old 28th July 2014, 11:45 PM   #17
moggi1964 is offline moggi1964  England
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So managed to get B+ and B- in check but when measuring C9 to ground and C11 to ground (with rectifier and the 5842's in place) I am getting runaway high voltages where I should expect to get something around 175Vdc.

Up till that point the checkout was going to plan.

Suggestions on what to check are welcomed.

Thanks.
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Old 29th July 2014, 03:26 PM   #18
JP is offline JP  United States
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You'll get high voltages until the tubes start to conduct. Mine takes ~30 seconds or so to stabilize, then you adjust from there with the trimmer.
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Old 29th July 2014, 09:54 PM   #19
moggi1964 is offline moggi1964  England
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I am using a Variac and getting well over 200Vdc and rising at only 70Vac on the Variac.

I'm worried about letting it run on or increasing the voltage.

Will R16, and it's equivalent on the other channel, blow before anything else does? If so, I'll risk it

Thanks JP.
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Old 29th July 2014, 10:12 PM   #20
JP is offline JP  United States
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I see nearly full B+ at initial power on - on my monster EML 520B TSE, that's 520VDC. No problems.

Remember that you're also starving the filaments using the variac = less emission = less current the tube can pass. This means the condition will last longer.
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