• 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
rongon
EF184 in triode for phono stage input?
Replies
108
Views
16K
rongon
rongon
daveinnz
Looking for some good education
Replies
16
Views
581
huggygood
huggygood
andyjevans
How to calculate safe screen grid voltage when in triode mode?
Replies
8
Views
806
directdriver
directdriver
dubadub
Series Resistance - running the numbers in my EL84 amp
Replies
7
Views
546
jhstewart9
jhstewart9
P
Universal driver
Replies
27
Views
2K
popa marius
P
DarekWawa
Schmitt phase inverter on small heptal pentodes such as 6Ж1П-ЕВ (6J1P-EV, 6Ż1P-EW). Is it possible and does it make sense?
Replies
8
Views
635
DarekWawa
DarekWawa
nerdius-maximus
Help a fool understand "ideal" or target "rp" for drive stages
Replies
7
Views
588
6A3sUMMER
6
V
Andy Grove designed power supply ANK L3 PSU max current
Replies
14
Views
941
Veeren
V
S
Odd B+ behavior
Replies
16
Views
684
Osvaldo de Banfield
Osvaldo de Banfield
rkoonce
BeePre (gen1 - 300B) volume control
Replies
3
Views
490
rkoonce
rkoonce
M
Help with Hickok 539C!
Replies
1
Views
256
huggygood
huggygood
B
PreAmp tube upgrades
Replies
9
Views
727
TheGimp
TheGimp
G
Eastern Electric Minimax pre schematic anyone?
Replies
23
Views
4K
poseidonsvoice
poseidonsvoice
E
Ear834 clone power supply issue
Replies
29
Views
1K
Electronewbe
E
M
Ideas input for a Interstage driven 300B SET
Replies
45
Views
4K
Dorin Bodea
Dorin Bodea
M
Help wiring these German transformers
Replies
32
Views
2K
AndreasS
A
bondini
Telefunken voltage stabiliser tubes - application note in German?
Replies
3
Views
465
Tarzan
Tarzan
SpreadSpectrum
Arduino-Based Tube Amp Control System
Replies
31
Views
3K
SpreadSpectrum
SpreadSpectrum
S
New idea: RE084 drives RS282
Replies
103
Views
5K
Zoran
Z
J
"BUGBIAS" circuit to solve blocking distortion for capacitor coupled tube amplifier
Replies
12
Views
1K
Doug De Young
D
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