Tubelab SE buzz and crackle - Page 2

wicked1 · 07:17 PM

Quote:

Originally Posted by rmyauck

I read a good mod which George is or has added to the SE amp is UF4007 SS diodes in series with the PS Trans. secondary wires to pins 4 & 6 of the 5AR4/GZ34.

Randy

I did that to mine. I forgot, but after I built mine I was having rectifier tubes arc over all the time... That solved that issue.. (Well, I also stepped up to a 5u4g for the rectifier, and added a current limiter for softer startup)

--don't use a 5u4g w/out adding current limiters!

magnetman · 3rd February 2013, 07:19 PM

Hi all,

J.michael, I didn't wait for the power caps to discharge this takes roughly 20 seconds.

MelB, I would have to agree it is in the power supply. Solder joint is a good idea, I also haven't changed the power tube.
actually I haven't worked out what set of tubes the signal is getting in either. I only assumed it was the 300b.

I would love to get a trace on a scope and work backwards.

rmyauck, That mod is quite interesting. I was having a discussion with my wife and the question of flask power outage came up.

cheers

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3rd February 2013, 07:19 PM	#12
magnetman diyAudio Member Join Date: Jun 2011 Location: Hobart Australia	Hi all, J.michael, I didn't wait for the power caps to discharge this takes roughly 20 seconds. MelB, I would have to agree it is in the power supply. Solder joint is a good idea, I also haven't changed the power tube. actually I haven't worked out what set of tubes the signal is getting in either. I only assumed it was the 300b. I would love to get a trace on a scope and work backwards. rmyauck, That mod is quite interesting. I was having a discussion with my wife and the question of flask power outage came up. cheers