• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Tubes / Valves

All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum
J
PP 807 stereo amp with 6F8G or JAN 7193 drivers/preamp
Replies
32
Views
2K
jderimig
J
SoaDMTGguy
Golden Tube SE-40 - Worth screwing around with?
Replies
6
Views
680
SoaDMTGguy
SoaDMTGguy
C
Odd power tube failure, what do we think happened here?
Replies
8
Views
599
anatech
anatech
R
Hum
Replies
23
Views
1K
hooman
hooman
ruffrecords
EL34 UL PP Transformer
Replies
81
Views
14K
baudouin0
B
rongon
Push-pull load lines for GU-50-Triode - did I do this right?
Replies
4
Views
604
nerdorama
nerdorama
T
Building a PP - BugAMP design with GU-50
Replies
34
Views
6K
tubekiddo
T
S
Why are people still touting the Mullard 5-20 circuit?
Replies
82
Views
12K
kgrlee
K
rongon
Lucky me, I have a pair of original Z565 OPTs -- But I have 4 ohm speakers...?
Replies
27
Views
2K
kodabmx
kodabmx
emartine
Loadline plotter
Replies
6
Views
554
b_force
b_force
E
Transformer spiral winding
Replies
31
Views
2K
Elvee
Elvee
S
Help with EZ80 rectifier
Replies
21
Views
2K
Kay Pirinha
Kay Pirinha
Hugo145
Exceeding interstage rated DC current
Replies
15
Views
814
45
4
P
LTP mega gain
Replies
45
Views
2K
p_haslam
P
E
Smoothing choke physical size
Replies
34
Views
2K
johnnyx
J
T
Van Der Veen Trans-30 built
Replies
16
Views
2K
tsetse1986
T
J
Missing pages
Replies
3
Views
291
rayma
rayma
Z
Local CFB and bootstrap: an hybrid 12AX7 driver with 55db of gain and CF-like Zout
Replies
35
Views
2K
rongon
rongon
L
simple method for changing plate/cathode resistors on PCB
Replies
51
Views
2K
6A3sUMMER
6
C
Tube Amp+MiniDSP+OpenBaffle
Replies
11
Views
561
mdpaudio
M
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