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Tubelab Discussion and support of Tubelab products, prototypes and experiments

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Old 3rd February 2013, 07:14 PM   #11
wicked1 is offline wicked1  United States
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Join Date: Jan 2008
Location: Midwest
Originally Posted by rmyauck View Post
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.

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!

Last edited by wicked1; 3rd February 2013 at 07:17 PM.
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Old 3rd February 2013, 07:19 PM   #12
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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.

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