• 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
swingarm63
Circuit ideas for KT66 stereo amp
Replies
94
Views
7K
swingarm63
swingarm63
J
Integrated stereo triode strapped 807s
Replies
31
Views
1K
krca45
K
stenak
6761 Tubes
Replies
3
Views
254
stenak
stenak
waltube
SOFIA TUbe tester users
Replies
0
Views
118
waltube
waltube
K
G2 as anode PL519 power amplifier
Replies
82
Views
10K
KeesB
K
M
Sanity check differential amplifier for DAC
Replies
40
Views
2K
Matthew78
M
V
Does RMS / duty cycle equivalency matter...
Replies
2
Views
173
veeblefetzer eddy
V
J
How well do LTP driver tubes using CCS need to be matched?
Replies
86
Views
3K
Bluesystems
B
D
New project - ANK L4 Mentor pre-amp?
Replies
24
Views
786
dovla83
D
D
Magazines in pdf format
Replies
19
Views
6K
The Prof
T
D
Restoring a Heathkit W4-AM: Rectifier tube question
Replies
36
Views
1K
Midnightmayhem
M
Windcrest77
How do I complete this dual Coleman cathode circuit?
Replies
12
Views
477
Windcrest77
Windcrest77
L
Citation 2024 Final
Replies
28
Views
1K
gerrittube
gerrittube
C
Source for replacement (neon) bulb for power lamp on HH Scott 99D?
Replies
13
Views
231
rayma
rayma
R
Help with ST-70 variant hum in both channels
Replies
140
Views
4K
Francois G
Francois G
tonescout
1000V Power supply question on 211 SET (quick simple one!)
Replies
34
Views
1K
tonescout
tonescout
P
Tube dynamic range expander
Replies
1
Views
206
artosalo
artosalo
S
OPT impeadance
Replies
9
Views
374
trobbins
trobbins
E
ST-35 - OPT
Replies
8
Views
619
doolybird
D
M
Welborne Labs SET DIY clone?
Replies
4
Views
424
markdd1039
M
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