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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: RE: Need To Develop A Short List Of Tubes For a BHK Pre Amp posted by Mister Pig on April 21, 2019 at 14:22:38:
"The BHK Signature Preamplifier features two 12AU7 dual triode vacuum tubes in the input stage that act as a zero feedback balanced input amplification pair. A unique self biasing constant current source and user selectable switch combination allows those who like to roll their own tube selections to place any acceptable 6, 7 or 12 series vacuum tubes inside the preamp. The twin hand-selected vacuum tubes that ship with the BHK are the preferred models we recommend and use in PS Audio's Music Room One reference system."
"The BHK preamplifier is supplied with 12AU7 dual triode vacuum tubes. These have a heater (filament) voltage of 12 volts (that's what the "12" in 12AU7 indicates). Replace these tubes with a similar design that runs on +12 volts for its filament voltage.It is possible to use a lower voltage tube, such as a 6 or 7 series dual triode. To use a +6 or 7 volt tube, you must change the filament voltage. This can be accomplished by moving two jumpers, abeled JP11A and JP12A, inside the BHK Preamplifier. You can also change the bias current running through the tube if you wish. The bias we use from the factory is 4 milliamperes. Using the second internal jumper set, labeled JP7 and JP8, this can be increased to 5 milliamperes by using the supplied connector to jumper JP7 and JP8 (they are normally not jumpered for 4 ma). If you don't understand these setting and terms, best to probably leave it at the factory setting. Otherwise, if you really need to know, contact our service department."
Tre'
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Follow Ups
- RE: Need To Develop A Short List Of Tubes For a BHK Pre Amp - Tre' 04/21/1918:32:12 04/21/19 (2)
- RE: Need To Develop A Short List Of Tubes For a BHK Pre Amp - Tre' 18:42:04 04/21/19 (1)
- RE: Need To Develop A Short List Of Tubes For a BHK Pre Amp - Mister Pig 06:24:30 04/22/19 (0)
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