Probably not for $31. Nice to know these buffers are available tho'.the Yaqin's cd1 , cd2 and cd3 try to do that
I like my cd2 and cd3 -- I know many if not most 'audiophiles' dont
Did you factor in polarity inversion with the FX vs not with CD2?This is so unscientific I'm reluctant to post it (not really)
my FX has Mullard 6j1 equivalent tubes , my CD2 Voskhod 6J1P-EV - all are well 'burned-in'
one night I switched the units in and out only once - they were between a Pre and an Amp
I could hear somewhat (goodness) what we claim the FX brings to a system with the CD2 in the FX's place -- I didnt match Vol technically and of course there were the different tubes
Generally I prefer the FX but there are most likely hard fact reasons why as mentioned above
This is so unscientific I'm reluctant to post it (not really)
my FX has Mullard 6j1 equivalent tubes , my CD2 Voskhod 6J1P-EV - all are well 'burned-in'
one night I switched the units in and out only once - they were between a Pre and an Amp
I could hear somewhat (goodness) what we claim the FX brings to a system with the CD2 in the FX's place -- I didnt match Vol technically and of course there were the different tubes
Generally I prefer the FX but there are most likely hard fact reasons why as mentioned above
Discussed earlier, the FX flips the polarity of the input, up for down. Because distinctive natural sounds are generally not polar symmetrical, some will sound different or wrong if inverted from their natural polar state. It may be audible as a dullness, lacking life to some if not most listeners.What "polarity inversion" ?
I just switched the units in/out and made sure the right/left ch were correct
On edit: I know the terms are different but I also checked to make sure speakers were in phase
I should have added I was using a Passive Preamp -- will edit
Discussed earlier, the FX flips the polarity of the input, up for down.
That is correct for a typical system. Some examples of program material may be itself inverted to confuse things further. The usual correct practice is to ensure the entire chain at both ends is non-inverting en toto.Thanks... did more reading with search feature
(sorry for the redundancy) So... to correct this the the speaker wires on both left and right side should be reversed (+ from amp goes to - on speaker) ??
I remember having a reverse polarity button on an Adcom CDP once... most times could not hear a difference engaged or not
You are very close, the 6SN7 has a gain factor of 20, as does the 12AU7, which replaced it, the 6AK5 can have a gain factor of 50 to 200, depending on the voltage.One question for the circuit knowledgeable folks on this forum. This preamp seems to have quite a bit of gain compared to my Mapletree 2ASE (6SN7 point to point wired preamp)which has 10 db gain, The FX Audio seems to have maybe twice as much gain? Is this gain from the tubes or is there an OP amp hiding in there somewhere? I looked at the picture of the bare preamp but it's all Chinese to me
I can answer two issues that have come up, when I said these ,"toys" are getting pricey, I was referring to the Japanese version , I paid $68 without the wall wart, but I saw the same unit for as high as $169. The Japanese version, the FX Audio 01J, features a switch which toggles between zero gain or minus 6 db.The gain of the 6AK5 in triode will be fairly low, lower with cathode degeneration. Heater bias can also reduce heater/cathode differential for cathode follower stages, the cathode will be at a 1/2 anode voltage in such service.
the Yaqin's cd1 , cd2 and cd3 try to do that
I like my cd2 and cd3 -- I know many if not most 'audiophiles' dont
If it's a pulse power supply, yes.So the wall wart PS that comes with this unit is 12V 1.5amp. Does the PS contain a voltage regulator?