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Old 25th August 2015, 06:15 PM   #1
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Join Date: Jun 2010
Location: south of england
Default Output transformer help

Hi guys,

Im still a novice and need a little help with some James audio output transformers i picked up, the amp itself is a cheap Chinese 6p3p i have been slowly modding.
The confusion lies with the old transformers have 2 wires B for power and P for plate, and the James outputs have 4 possible connections B - S - 3.5k and 5k, do the 3.5 or the 5k go to plate, and if so, what is S connection for ?.
Any help would be much appreciated.
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Old 25th August 2015, 06:22 PM   #2
rayma is online now rayma  United States
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Quote:
Originally Posted by mr scratch View Post
the James outputs have 4 possible connections B - S - 3.5k and 5k,
do the 3.5 or the 5k go to plate, and if so, what is S connection for ?.
S is for screen, an Ultralinear connection. Choose the 3.5k or 5k plate connection based on your tube impedance.
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Old 25th August 2015, 06:34 PM   #3
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Thanks for confirming that Rayma, its good to know i now have that as an option for a future design...thought i might stand for screen, but being a noob was not sure of its implementation .
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