Power down the amp and let everything cool down a bit then put the bottom chassis cover back on.
Remove the dummy RCA plug.
Place your ST70 amp in its spot, connect your speakers, RCA input and power lead to it and power the
amp back up. After about a minute or so, the amps are ready for your listening session!
If things do not work as they are supposed to:
If the red LED on the AB-Q module does not come on immediately after the amp is powered up, power it
back down and check the wiring/connections from pins 2 & 7 on the V3 socket to the two 6,3 AC pads on
the AB-Q module. Make sure all is good there!
If none of the blue LED’s come on after the 40-50s soft start delay, power the amp back down. Check all
your wiring from the AB-Q module to each of the output tube pins and to the ST70 driver pcb.
If say only three or two of the blue LED’s come on after the soft start delay, power the amp back down
and check the wiring to that particular tube for which the blue LED did not go on for. Also check to make
sure that the pins in that tube socket are nice and tight and that the tube fits into the socket not at all
loose. Also check the pins in the tube socket of any oxidization, if they are dirty, perhaps use Deoxit or
similar to clean the pins!
Do’s and don’ts:
Do check that the pins in each tube socket are tight and that each tube does not fit loosely in the socket.
Do check that the pins in each tube socket are clean of oxidization, use Deoxit or similar if they are not
clean.
Good fitting and clean pins in tube sockets make ALL the difference!!
Don’t do a lot of tube rolling! This is a sure way to loosen up the pins in your sockets! If you cannot help
yourself and you must do tube rolling, check the tightness of the pins each time you swap tubes!
Measured results:
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