@atmasphere
Thanks for the Info! My amps use 12BH7 tubes so I am going to try some 12AU7 tubes that I have sittin’ around!
Thanks for the Info! My amps use 12BH7 tubes so I am going to try some 12AU7 tubes that I have sittin’ around!
Line Stage Preamplifiers AX vs AU
Just learning a few things about these components,,, seems to me best tube fora linestage (PREamp term should only be applied to a amp with phono section/ w/o phone, = Line Stage) anyway,, seems to me best circuitty for a *passive line stage* would be the 12AU7 tube, and not employ any 12AX7's.
The AX ha s a mu of 100, so it really scrams and thus pushes the db level too much as it reaches the pwoer amp.
The AU has a mu of only 15, so its alsmost passive, which is really whata line stage should be , just passing the signal from the source to the amp, with the least involvement, IMHO alot of line stage amps, have too much coloration and muddiness due to the usage od 12AX7's.
Leaving me with voting the only line stage employing all 12AU7 circuitry i know of under $2K as best Line stage on the market.
https://en.cayin.cn/products_info?itemid=120
The AX ha s a mu of 100, so it really scrams and thus pushes the db level too much as it reaches the pwoer amp.
The AU has a mu of only 15, so its alsmost passive, which is really whata line stage should be , just passing the signal from the source to the amp, with the least involvement, IMHO alot of line stage amps, have too much coloration and muddiness due to the usage od 12AX7's.
Leaving me with voting the only line stage employing all 12AU7 circuitry i know of under $2K as best Line stage on the market.
https://en.cayin.cn/products_info?itemid=120
Showing 3 responses by yogiboy
@atmasphere I was told that a 12BH7 can be used as a replacement for a 12AU7. Is that true? 12BH7 vacuum tube is a medium mu dual triode. 12BH7 was designed as a driver in TV sets. 12BH7 Tube is capable of driving plenty of current with low distortion. This makes it ideal as a driver for power tubes in modern tube audio amplifiers. 12BH7A tube with suffix ’A’ has a controlled heater warm-up for use in a series filament circuit. |