• 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
M
mV meter
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4
Views
379
Milkduds
M
H
Stereo Voice 120A Amplifier Receiver schematics
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1
Views
630
PineappleDave
P
gerrittube
KT150 Push-Pull audio frequency oscillations
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62
Views
3K
prairieboy
prairieboy
C
Glass Audio 1/89 article Dynaco ST70
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0
Views
183
cygnus x1
C
longspeak
are cathode fuses a bad idea?
Replies
60
Views
2K
benchbaron
benchbaron
T
Source Follower with Filament Bias
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8
Views
428
euro21
E
C
Audio Innovations 500 output transformer
Replies
43
Views
12K
ro9397
R
mbrennwa
Repairing broken filement on 300B (32B) tube?
Replies
7
Views
328
rkoonce
rkoonce
tubedude63
6SN7 preamp circuit opinions
Replies
15
Views
3K
Triodos
Triodos
D
parmeko neptune series model 6000/89 transformer
Replies
1
Views
366
apmdavies
A
S
Step up voltage TVC advice
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1
Views
127
gupsta
G
A
Chinese FU-32 tube. What actually is it?
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29
Views
22K
MHbach
M
elac310
Uesugi 211 (vintage 1971)
Replies
72
Views
6K
elac310
elac310
Okietube
6BX7-6BXL SET amplifier for audio
Replies
15
Views
884
jhstewart9
jhstewart9
jam
Frank's Ultimate Tube Preamp
Replies
497
Views
280K
RPS75
R
Q
Cathode bias mod for Dynaco ST-70?
Replies
26
Views
896
6A3sUMMER
6
C
VTA ST120 - Troubleshooting - Only 1 Channel Operational
Replies
2
Views
150
Francois G
Francois G
jkojic
Dynavox VR70-11E are there internal fuses please
Replies
0
Views
90
jkojic
jkojic
R
Output Transformer Interleaving
Replies
23
Views
2K
50AE
50AE
bondini
Diego Nardi Monophono mid-band gain?
Replies
15
Views
558
bondini
bondini
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