• 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.

EL34, KT88, High Voltage?, VTL..

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K

kegger

R.I.P.
Joined 2004
The main issue I personally would have with your suggestion an giving the amp back to
the customer is the removing of the 10ohm cathode resistor and biasing the amp with a
scope, at that point the customer has no clue how to check his amp, replace tubes, ect.

Cathode bias and triode are things known and understood, even for the guy just listening.

(I do appreciate the suggestions though, thanks)

Cheers,
Keg
 
M

multi

R.I.P.
Joined 2011
I repaired a VTL amp using Triode connected 807's running at 600 volts. When I received the amp some one had set the Bias to 70Ma and the 807"s where bright red. Found out from VTL that it should be set to 26Ma. Later I built a Triode 807 amp Fixed bias and ran it at 560 volts for many years. No problems. The data recommends no more than 400 volts, cathode bias.
Phil.
 
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