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Old 18th June 2017, 08:12 PM   #11
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Originally Posted by Nikon1975 View Post
R2 should be 150K not 150 ohm. if it was 150 it tried to dissipate almost 1000w
+1

R2 is a bleeder resistor for the 1st filter cap, it has the full raw B+ across. It needs to be 150k.

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Old 20th June 2017, 02:48 PM   #12
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maybe itīs available only to members.
There are no "members." Its available to everyone as all of my material.

Yes, R2 is the wrong value and would fry in a flash. It needs to be a 150 K ohm 3 watt part. R4 must also be 150 K ohm or there will be more bad parts.

It is possible that the rectifier tube got damaged by attempting to pass 3 amps or so of current.

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Maybe the SS/Tube switch was ON and the SS diodes took the surge.
I doubt it. R2 would have instantly vaporized, or the fuse should have blown. If you are on US power the fuse should be 2 amps, 1 amp on 240 volt power.
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Old 20th June 2017, 02:53 PM   #13
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Originally Posted by Tubelab_com View Post
It is possible that the rectifier tube got damaged by attempting to pass 3 amps or so of current.
Surprises me that the tube took that near-short without a flash and a bang. I have a tube rectification supply that slightly pushes the spec boundaries - took a while to select a few tubes that work without flashing over...

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Rundmaus
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Old 20th June 2017, 04:18 PM   #14
JMFahey is offline JMFahey  Argentina
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Please post a readable schematic, I am unable to open the Tubelab page (page not found), maybe itīs available only to members.
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Originally Posted by Tubelab_com View Post
There are no "members." Its available to everyone as all of my material.
Thanks.
I clicked http://www.tubelab.com/images/Assemb...e_noCFB.jpg%5D and page answers:

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Nothing Found

Apologies, but no results were found for the requested archive. Perhaps searching will help find a related post.
Hence my comment
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Old Yesterday, 12:39 PM   #15
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Originally Posted by Tubelab_com View Post
I doubt it. R2 would have instantly vaporized, or the fuse should have blown. If you are on US power the fuse should be 2 amps, 1 amp on 240 volt power.
Hi! thanks for the explanation. I don't know how could I make a 10^3 ohm mistake..... I checked values 10 times, looks like it was not enough. Anyway, happy to know where the problem is.

Regarding to the fuse, it has blown.. I was trying with 1A first and it blew, then put a 2A and there I got some second of work before R2 blew. I'm using 230V power (europe) so I should go for 1A? can I try higher values (maybe 1,5 or 2A) in case it blows?

thx!
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