• 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
Fixed bias applied to the cathode
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36
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3K
kmtang
kmtang
K
300B Schematics for MQ FS-030
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18
Views
1K
Paul Joppa
P
F
12AU7 to 6FQ7/6CG7 adapters
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15
Views
985
Francois G
Francois G
Henning145
TAC KT88 schematic diagram
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5
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522
huggygood
huggygood
M
Hybrid amp Model IF-AD03
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2
Views
340
Meerkat 70
M
michaelt17408
Elekit 8600s Build
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9
Views
582
SomekPoland
SomekPoland
T
Does audiophile tube builders know what a grid stop is for?
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155
Views
8K
Hearinspace
H
bondini
Tube vendor MDB Ventures has closed
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2
Views
387
bondini
bondini
markcasazza
Looking for circuit recommendations for MM phono and "regular" preamps
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17
Views
2K
rayma
rayma
aalex
Mic preamp idea (6N1P + 12AU7)
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28
Views
2K
aalex
aalex
P
VOX AC30 CC2 Ground scheme
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10
Views
778
baudouin0
B
B
Bench Testing a Tube Amp Without Tubes
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16
Views
1K
bedrock602
B
O
Boyuurange A50 modding experience
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4
Views
1K
optimationman
O
P
Tracking down source of noise, 2A3 Amp, goes away when pot turned up
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10
Views
375
rayma
rayma
N
5Ц4С replacement with solid state?
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115
Views
6K
Never Get Old
N
dubadub
Recommendation for a DIY Push-Pull amp kit/PCB?
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28
Views
3K
huggygood
huggygood
W
Identifying 211 VT4C or 284D Western Electric?
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3
Views
730
Chris Hornbeck
Chris Hornbeck
thesharkcharles
Philco Gramophone Amp Project
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3
Views
514
thesharkcharles
thesharkcharles
M
Choke load phono what if
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1
Views
331
euro21
E
jhstewart9
Does Allen Wright's Cathode Bias Resister Scheme for IMD Reduction Work? Yes? No? Maybe!!
Replies
35
Views
3K
jhstewart9
jhstewart9
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