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Tubelab Discussion and support of Tubelab products, prototypes and experiments

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Old 21st April 2013, 05:21 PM   #31
neomat is offline neomat  France
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Hello!
I just have a quick question: does a cl130 inrush limiter fit instead of a CL140?
Thanks!
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Old 22nd April 2013, 04:51 PM   #32
rknize is offline rknize  United States
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Looking at the specs, it appears that it will work just fine.
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Old 22nd April 2013, 10:28 PM   #33
rock12 is offline rock12  United States
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In my test run I used a CL90 and nothing blew up
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Old 13th December 2014, 02:40 PM   #34
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Tubelab, it's 5 year mission. To explore strange new tubes, to seek out new circuits and topologies, to boldly go where no tube has gone before......
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Old 27th November 2016, 10:25 PM   #35
exwiso is offline exwiso  Australia
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I have only recently received my SSE board and note that I have the 3 additional component positions. Thank goodness for this oldish thread. It certainly helped to clear up the mystery of the additional components....well almost.
I assume that D1 and D2 remain as set out in the parts page.
It seems also that D1- 4 are all designed to assist the rectifier tube and are connected to and are active with the tube. Does this remove the option to switch between solid state and tube rectification?
The additions and substitutions do become a bit confusing. I have these on order
Fairchild RHRP15120 (D1 and D2)
DIODES INC. 1N4007-T ( D3 and D4)

IXCP10M45S (U10 and U20)

Have I got these right?

Thanks
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Old 28th November 2016, 02:12 AM   #36
zman01 is online now zman01  Bangladesh
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Hi exwiso,

Your choice of parts looks ok.
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Old 28th November 2016, 02:33 AM   #37
exwiso is offline exwiso  Australia
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Thanks zman, much appreciated.

I'm still a bit confused over the rectification, though. I do plan to use tube rectification , but to have solid state as an switchable option. All through the tubelab web pages SS is indicated as optional, either/or. But there quite a lot of posts in other threads here which suggest both are used together i.e. the ss supporting or protecting the tube. Certainly looking at the traces on the pcb they seem to suggest this is so.

If this is so, that's fine: I won't bother with an extra switch.

Last edited by exwiso; 28th November 2016 at 02:34 AM. Reason: typo
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Old 28th November 2016, 03:46 AM   #38
zman01 is online now zman01  Bangladesh
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exwiso,

IMHO better to stick with tube rectification only - the (longer) warm up time of the 5AR4 rectifier tube specified by George results in the other tubes getting the full B+ a bit later, which is good for the life of the tubes.

My understanding from George's post on the first page of this thread is that the D2 and D3 are to keep the rectifier safer.

If I may ask, what are the other component choices you have made e.g. power transformer, OPTs, choke, tubes?
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Old 28th November 2016, 05:10 AM   #39
exwiso is offline exwiso  Australia
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Pretty orthodox in the power side; Hammond 374BX with James 6123 OPT's and the Triad F-14X choke.

I have been thinking about the Mundorf tubecaps instead of the electrolytics though. They do a 47uFat 600v but only 100uF or 200uF, both at 550v. I had been thinking of using the 200uF in C2.

I would be interested in any opinions on this?
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Old 28th November 2016, 05:11 AM   #40
zman01 is online now zman01  Bangladesh
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Quote:
Originally Posted by zman01 View Post
exwiso,

IMHO better to stick with tube rectification only - the (longer) warm up time of the 5AR4 rectifier tube specified by George results in the other tubes getting the full B+ a bit later, which is good for the life of the tubes.

My understanding from George's post on the first page of this thread is that the D2 and D3 are to keep the rectifier safer.
Just to clarify, use the rectifier + D2, D3, but no switch.
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