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Audio Output Triodes – Vintage Tube Services
http://vintagetubeservices.com/audio-power-triodes/
Audio Output Triodes Stock List. NOTICE: The tube prices in this catalog CANNOT be compared to others!! Each tube sold by VTS has been LABORIOUSLY auditioned, scrutinized, matched and pin polished by Andy Bowman in the V.T.S. Analog Laboratory using National Institute of Standards registered gear.
POWER TUBES - oestex.com
http://www.oestex.com/tubes/triode.htm
However triodes suitable for audio power operation are becoming extremely scarce in the world market and aftermarket prices for popular types have increased astronomically in recent years. So it is often more convenient to use tetrodes, pentodes or beam power tubes because of availability, cost or convenience. An often overlooked design feature ...
A 211 SE Triode Amp | audioXpress
https://audioxpress.com/article/A-211-SE-Triode-Amp
While surfing the Internet and reading various periodicals, I noticed “big power triodes,” namely, the 211/845 family. Even though Svetlana has a current line of power triodes (572 and 811 series), I was curious about the older American triodes. Supposedly, for the ultimate SE DHT sound, these were the tubes to use.
DHTRob - Preamplifier design using power triodes
https://dhtrob.com/zelfbouw/preamplifier_design_using_powertriodes.php
Also the power triodes' bigger internal structure is susceptible to vibrations and transformer stray fields, resulting in being microphonic and causing hum when not used in the last audio stage. Also these are running on higher current thus the inner structure has to dissipate more heat which causes the metal parts to expand.
Triode power amplifier. - Angelfire
https://www.angelfire.com/electronic/funwithtubes/Triode_Power_Amplifier.html
Power triodes may or may not have sounded better. We really have no way of knowing because there are no power triodes to use in an amplifier. That is, unless you want to go up to a pair of 811As with 1200 volts on the plates or …
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