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Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

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Old 25th February 2008, 04:56 PM   #1
audiofan is offline audiofan  Canada
diyAudio Member
Join Date: May 2003
Location: quebec
Default tube checker

I would like to have a simple tube checker for : 12AX7 12AT7 &12AU7 ( guitar amp stuff )

So I desing the attached circuit

170 V 10 mA load line for 12AT7 & 12AU7

170V 2mA load line for 12AX7

0-2V bias

Should I build it as-is ?
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Old 25th February 2008, 06:04 PM   #2
alejo is offline alejo  Argentina
diyAudio Member
Join Date: Jun 2004
Location: bs.as.
please use power transformer. !!!
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