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Old 26th March 2013, 10:49 AM   #1
gmonno is offline gmonno  Italy
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Join Date: Jul 2004
Location: Madrid - SPAIN
Default SE : help with power transformer

Hi, I'm in the way of building a Tubelab SE, my first problem is with the power supply.
Probably I as wrong ordering a Hammond 373HX who put out 350-0-350 , it is 700V ct

This would give me far more than the 400V I was intented to drive the 300b

Now what can I do before buying another transformer?

I have a choke to substitute R4, it is a 7H 200mA that may help, but I think is not enough.

Any suggestion of how to drop out the excess of voltage?
The bad choice was the -bigger is better idea.

Another thing, I cannot find the parts list page for the SE, anyone has it?


Thanks for your help

gmonno
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Old 26th March 2013, 03:52 PM   #2
Green77 is offline Green77  Sweden
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Join Date: May 2007
Location: MJOLBY
Hello.
I have a TSE with 300b tubes.
I also had a hammondtrafo that put out to much v. I did place a 10w, or maybe it was bigger like 20w, resistor in serie before my choke. Sure it will have some affect to the music but i think it plays really nice..
Regards //Daniel
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Old 26th March 2013, 04:21 PM   #3
jrenkin is offline jrenkin  United States
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Join Date: Nov 2007
Location: Denver, Colorado
I think there are a lot of ways to reduce voltage. A bucking transformer, a smaller first capacitor in a CLC for example. What I did was add an additional RC filter, with the resistor sized to your need. This also helped ripple in B+, which I still found noticeable with 96db speakers.
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