scratch and music is diminished, and the two assume much
more pleasant proportions.
The authors believe that for
sheer listening pleasure thee ultra-linear amplifier represents the
best that can be achieved at the present state of the art. Others
who have had an opportunity to hear and try the circuit agree with
this; and these beliefs will not be shaken until something comes
along which sounds better, or at least sounds as good and can be
built for lower cost.

PARTS LIST
C1
C2, C3, C4, C5
C7
C7
C8, C,
C11
R1,
R6, R8, R9
R2,
R3, R15, R16
R4, R5
R7
R10
R11,
R12
R13, R14
R17
R18
R19
R20

VI
V2
V3,
V4
V5

500 µf, 6 v. electrolytic
0.2 µf, 600 v.
paper
100 µf, 50 v. electrolytic
120 µµf, mica
20-20 p1,
450 v. electrolytic
40-40 p1, 450 v. electrolytic
0.47 meg, ¼
watt
200 ohms, 1/2 watt
1000 ohms, ¼ watt
0.1 meg, 1 watt,
5%
0.16 meg, 1/2 watt
560 ohms, 1/2 watt
47,000 ohms, 2
watt, 5%
0.12 meg, ¼ watt
350 ohms, 10 watt
12.003 ohms, ¼
watt
22,000 ohms, 1 watt
2200 ohms. 2
watt

6SL7
6SN7
6L6
5V4

T1 Acro TO-300
output trans-
former. Primary: 6600 ohms plate to
plate,
tapped for screen; secondary: 16, 8, and 4
ohms.

T2 Power
transformer: 370-0-370 v. at 130 mA; 5 v. at  2 A; 6.3 v. at 3
A.

L1 Filter choke, 8 Hy at 130
mA.

pg.
7

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