Augustica
®
T e c h n o l o g i e s
Page 9 of 9
instead of 17 Volt, as the 1 Volt difference might be enough to bring the regulator back
into regulation.
Fifth, using wire, connect the terminal block K6 on the power supply's PCB with the
terminal block K4 on the amplifier's PCB. Measure the filament voltage regulator IC3
LM1084V output voltage with the load provided by the right channel filament bus of the
amplifier Frigate
®
. If the filament voltage regulator IC3 LD1084V fails to regulate, try
either lowering the filament voltage a tad, or increasing it a tad, for example try 16 Volt
instead of 17 Volt, as the 1 Volt difference might be enough to bring the regulator back
into regulation. Power down the filament buses of the power supply by disconnecting low
voltage filament transformer or variac from the power supply of the amplifier Frigate
®
.
Sixth, attach the high B-plus voltage transformer leads to the terminal block K1 of the
power supply's PCB and insert the 6922 and 6H30Pi tubes in their sockets on the
amplifier's PCB. Using wire, connect the terminal block K2 on the power supply's PCB
with the terminal block K2 on the amplifier's PCB.
Seventh, bring up the AC voltage.
Eighth, measure the voltage across ground and B-plus pads of the amplifier's PCB in the
left and right channels. If the B-plus voltages of two channels differ by more than 10
VDC, try switching 6922 and 6H30Pi tubes from one channel to the other. If the voltage
imbalance does not follow the tubes, there is a problem, probably a misplaced part. Only
after you are sure that both filament and B-plus power buses are working properly should
you attach the amplifier Frigate
®
to a headphone.
L
ET
U
S
K
NOW
W
HAT
Y
OU
T
HINK
If you would like to see some new audio PCB or kit or recommend a change to an
existing product, drop us a line by e-mail on the website www.Augustica.com (begin the
subject line with “Frigate” or the SPAM filters are sure to eat your message).
