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Old 12th October 2019, 08:07 PM   #1
debug3000 is offline debug3000  United States
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Join Date: Oct 2019
Location: Portland, OR
Default TU-8600 300b compatibility issue

Hi all,
I got the tu-8600 yesterday and wondering if it's compatible with 300b XLS tubes.
From the circuit map looks like the transformer output for filament is 6v 2.2A which eventually goes to 5V to heat 300B. I have a pair of KR300B XLS which draw current 1.7A for filament.

Just wondering if I can fire up the 300BXLS? Thanks.
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Old 12th October 2019, 08:56 PM   #2
audiopro is online now audiopro  Canada
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Join Date: Feb 2004
Location: Hamilton, ON
A typical 300b has a filament current 1.3 to 1.5 A. If there separate windings of 2.2A then you are fine. If there's only one winding you don't have enough current for regular 300b's let alone the KR.
Can you be a little more clear or post the schematic.
Dan Santoni
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Old 13th October 2019, 01:23 AM   #3
vkung is online now vkung  Canada
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Join Date: May 2005
Location: Vancouver BC Canada
TU-8600 only works up 300B-98.
Please do not use high current KR 300B
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