kcline
Tube Audio Collector
PleaseSee pictures. Had these for a long time. Have a great story that came with these. Gentlemen I got these from told me he was a professional tube listener for Conrad Johnson and other companies he had all CJ equipment said it was top of the line. He needed 7 Telefunken 12AU7 used tested good was OK, so for those he gave me both line stages a box of 6SN7 & 6SL7 tubes and a box of 12AT7, 6DJ8. 7308 6922 and other tubes with same pinouts. The QA-001 uses either 6SN7 or 6SL7 or 6SU7 5691 5692 and others are possible. The QA-111-U has switch that lets you use 12 volt tubes like12AX7 or same pinout or throw switch to 6 volt and use 6DJ8 or same pinout. This man never heard these line stages he used them to pre-heat tubes so could hot change them with others in his main system. They have worked well I just use the QA-001 to setup tem. lashups for testing other gear. The QA-111-U I have had setup in systems and it works well only tube it does not like 5751,s they make the pre. hum 
In pictures QA-111-U is using 6FQ7 RCA clear tops
In pictures QA-111-U is using 6FQ7 RCA clear tops
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