• 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
thoglette
Classic Valve microphone pre amp schematics - where to look
Replies
10
Views
1K
thoglette
thoglette
Tha(t)oneGuy
*non* polarized film caps?
Replies
17
Views
669
Tha(t)oneGuy
Tha(t)oneGuy
K
2 Octal splitter/driver combinations for KT88 amp
Replies
37
Views
3K
kb2wyl
K
stenak
The 6V6 Lacewood Amo V2.0
Replies
23
Views
2K
stephe
stephe
inline_phil
6H30∏ test settings on a Hickok 539C
Replies
0
Views
301
inline_phil
inline_phil
J
Need Service Manual for Counterpoint NPS200
Replies
2
Views
404
JMSMartins
J
J
Michaelson & Austin TVA-1 info
Replies
75
Views
44K
as_audio
A
C
Question about speaker sensitivity and tube amps
Replies
4
Views
559
ChetJettison
C
B
Input signal Current ??? (as Input xformer spec)
Replies
0
Views
228
Blitz
B
H
KT88 amplifier
Replies
127
Views
15K
zenzen
Z
P
Methods for assessing vacuum in tubes
Replies
4
Views
482
Osvaldo de Banfield
Osvaldo de Banfield
Tha(t)oneGuy
gain stage phase inversion
Replies
16
Views
1K
6A3sUMMER
6
rdf
Recommendations for SE UL OPT, greater than 6K primary, over 30 watts?
Replies
29
Views
1K
rdf
rdf
7
DC/DC converter for 200VDC tube pre. Avoiding converter noise (digital switching noises and hiss)... Possible?
Replies
21
Views
1K
Globulator
Globulator
H
Hum identification
Replies
14
Views
482
hoho
H
M
Requesting help building ASUSA 100 watt, 6146 tube mono amps
Replies
19
Views
1K
sser2
S
Fuling
Mains transformer safety Q
Replies
9
Views
592
Tom Bavis
Tom Bavis
C
need help with upgrading capacitors in a tube amp
Replies
26
Views
2K
pblix
pblix
I
Dynakit ST35
Replies
11
Views
690
Boydk
B
G
new Jackson 648a tube tester and 829b tubes to be tested
Replies
12
Views
498
retailer
R
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