manually adjustable bias
JimBRICK
Posts: 1,543
the combo I'm looking at from av123 says the integrated has manually adjustable biasing. And I opening a can of worms here?
http://www.av123.com/products_product.php?section=processors&product=26.1
Frequency Response: 20Hz to 20KHz
Class AB
Power Rating: 38W x 2
Voltage: 120V
Tube cage is attached with banana plugs for easy removal
Manually adjustable bias
Input Impedance: 250K Ohms
Output Impedance: 4 or 8 Ohms
Input Sensitivity: 380 mV
S/N Ratio: >90dB / T.H.D - 1% (standard tube spec)
Dimensions (WxHxD): 11.9" x 8.1" x 13.25"
Weight: 56 lbs.
Tube Complement:
4 X 5881
2 X 12AX7
2 X 6922
2 X 12AU7
Warranty: Three years except 90 days on the tubes
http://www.av123.com/products_product.php?section=processors&product=26.1
Frequency Response: 20Hz to 20KHz
Class AB
Power Rating: 38W x 2
Voltage: 120V
Tube cage is attached with banana plugs for easy removal
Manually adjustable bias
Input Impedance: 250K Ohms
Output Impedance: 4 or 8 Ohms
Input Sensitivity: 380 mV
S/N Ratio: >90dB / T.H.D - 1% (standard tube spec)
Dimensions (WxHxD): 11.9" x 8.1" x 13.25"
Weight: 56 lbs.
Tube Complement:
4 X 5881
2 X 12AX7
2 X 6922
2 X 12AU7
Warranty: Three years except 90 days on the tubes
2 CHANNEL
Speaker - Klipsch Heresy II
Under construction
Speaker - Klipsch Heresy II
Under construction
Post edited by JimBRICK on
Comments
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Most tube amps require to manually adjust the bias to match output from all the tubes. This is not a complex process, and only requires you to have a multimeter. You need to bias whenever you change the tubes, and maybe every six months after. Some amps have auto biasing, but they are rare._________________________________________________
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Cool I was a little apprehensive about that. This looks like a cool little deal to start with tubes2 CHANNEL
Speaker - Klipsch Heresy II
Under construction -
I was sending a link to one for sale, but it turned out to be sold already...You'll see them from time to time in the AV123 Classifieds.Husband, Father, Son, Brother, Friend.
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If you buy it you will need to check the bias after turning it on and letting it warm up for about an hour, adjust the bias and let it run for the rest of the day, then check it again the next morning after the unit has warmed up, after that every three months is usually fine, although if you are obsessive you can check it as much as you like.
RT1 -
A pretty good primer on biasing schemes, based on a quick look...
http://www.harpamps.com/micKqanda/What-is-Bias.html -
Edit wrong thread
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give these folks a call.
http://www.usatubeaudio.com/melody-sp7.phpAmplifiers: Norma IPA 140, MasterSound Compact 845, Ayre v6xe, Consonance Cyber 800
Preamp: deHavilland Ultraverve 3
Dac: Sonnet Morpheus 2, Musical Paradise mp-d2 mkIII
Transport: Jay's Audio CDT2 mk2, Lumin U1 mini
Speakers: Rosso Fiorentino Volterra II
Speaker Cables: Crystal Clear Magnum Opus 2, Organic Audio Organic Reference 2
Interconnects: Crystal Clear Magnum Opus 2, Argento Organic Reference 2, Argento Organic 2
Power Cables: Argento Organic Reference, Synergistic Research Foundation 10 and 12 ga.
Digital cables: Crystal Clear Magnum Opus 2 bnc, Tellurium Q aes, Silnote Audio Poseidon Signature 2 bnc
Puritan PSM156 -
I think I'm gonna be on the lookout for a JD502B or JD801A from Jolida2 CHANNEL
Speaker - Klipsch Heresy II
Under construction -
give these folks a call.
http://www.usatubeaudio.com/melody-sp7.php
that website is awesome, thanks for that. The shanling stuff looks great2 CHANNEL
Speaker - Klipsch Heresy II
Under construction
