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OPERATION MANUAL
Installing Tubes
!
There is nothing particularly special about installing the tubes other than making
sure they are the correct ones! Please refer to page 5 for tube locations.
The OA3 and the OC2 regulator tubes do not get hot and it is common for them to
flash a few times when turning on and again when turning off.
Make sure tubes are OFF and COOL before you remove or install them. Contrary to
popular misinformation you can touch the tubes without having to clean your finger
oil from the glass. Your finger oil will have no effect on the operation or the life of
the tubes.
!
!
Tube Matching
!
Matching the tubes is not required in this amp since the channels can be
individually adjusted, however it is nice to install the output tubes as well as the
input tubes in matched pairs whenever possible so that you do not have to correct
for channel imbalances that might otherwise result.
There are two output tubes (6V6) and two input tubes (12AU7) that you should
purchase in matched pairs. These are the audio tubes. All the remaining tubes are
power supply tubes.
!
Tube Substitutions
!
The 6V6 output tubes can be substituted with 6Y6, 6K6, 6F6, 6L6
!
The 12AU7 can be substituted with 5963.
!
The OA3 can be substituted with OB3 OC3 and OD3, although the highest power
and lowest distortion will come from the OA3.
!
The OC2 and 6CA4 should not be substituted.
!
PAGE
8
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14
MODEL : MINITORII - DESKTOP AMPLIFIER
REV 1 MAR 2018
WWW.DECWARE.COM
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