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Tube Location & Bias adjust points
OUTPUT TUBES:4 x RUSSIAN 6550
The 6550's used are the Russian up-rated 6550A's. This has been proven to be the rugged and reliable of this type.
The MANLEY STEREO 75 + 75 has been thoroughly optimised around this tube. Use of unapproved tube types can and will
void your warranty.
DRIVER TUBES: 2 x 6414
The 6414 is an American military uprated version of the 12BH7A with increased current drive.
INPUT TUBE: 12AT7WA
The 12AT7WA has several equivalent numbers, (12AT7, 12AT7A, 6201, ECC81, etc.) Any of these types may be
used. We have selected this 12AT7WA very carefully for noise, microphonics, and constancy. Replacement tubes of premium
quality are always available from MANLEY LABORATORIES.
TOP VIEW
2
1
12AT7
6414
4
3
1 2 3 4
BIAS MEASUREMENT POINTS
BIAS ADJUSTMENT POINTS
1 2 3 4
6414
12AT7