Triodeguy int EL34PPcir.PDF

(20 KB) Pobierz
R13
3.65k/1W
+440V
C13
10u/630V
C14
10u/630V
R12
100k/1W
R11
100k/1W
C3
0.1u/400V
R25
910R/2W
R28 2.2k
C
NC
R21
390k
RL1
NO
X3
EL34
12V
VR3
500
Bias (65mA)
R7
33.2k
R8
331R
R9
332R
X2A
6SL7
X2B
6SL7
M1
DN2540
R31 24
INPUT
R10
1K
Ferrite Bead*
C5
100u
50V
Adjust VR3&4 for
65mA per tube
OUT+
VR4
500
Bias (65mA)
RL1,2
Ormron Z744
VR1
250k
OUT-
M2
DN2540
R32 24
R1
249k
12V
NO
Ferrite Bead*
X1
6SJ7
R22
390k
X4 EL34
R29
2.2k
C
NC
R6
100k
R4
10k
RL2
R26
910R/2W
C4
0.1u/400V
VR2
10k
Adjust VR2 for
55 to57V
across R5
C2
3u
250V
R3
100k
8ohm connection
shown
C16
43p
RL3, Ormron Z741
R2
51k
C1
1u/250V
R5
13k/1W
C
NC
SOWTER UA21
R27
36k
RL3
NO
-300V
C15
10u/630V
12V
This document & the information herein
is the sole property of Richard F. Sears
and shall not be used for commercial
purposes without the express written
permission of Richard F. Sears.
(triodeman@earthlink.net)
RECOMMENDED COMPONENTS:
Resistors, Holco metal film;
H4 (1/2W, 1%) and H2 (1W, 1%)
2W, Kiwame carbon film
12W, Mills MRB-12
Decoupling capacitors, Solen or AEON film.
Coupling capacitors, Paper-in-oil or Auricap
C5, Blackgate N
NOTES:
1/ R7 & VR2 form a variable shunt input attenuator.
Sources should be able to drive 33k load.
The phono-stage is specifically designed
for this input load.
2/ Normal mode is triode: Energise RL1,2 & 3 for UL
Rev. F
10/8/2004
EL34 INTEGRATED AMPLIFIER
Switchable on-the-fly Triode / UL
AUDIO CIRCUIT (Pg 1 of 3)
mc6demo\data\data\el34int
RICHARD F. SEARS 6/1/2001
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