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Woo Audio WA6 pre-amp outouts

post #1 of 6
Thread Starter 
I contacted Jack a few days ago to confirm about this. He said the option is available for $100. Is there anyone that could shine some light on whether a SET transformer coupled amp like the WA6 would made a good pre-amp?
post #2 of 6
Yes, the output impedance would be insanely low, which is just fine. Likely the preamp output mod would just be adding a set of RCA jacks on the back that tie into the headphone jack. It is also possible that there is a higher impedance tap on the output transformer that he could use.

Either way, some of the nicer tube preamps out there are transformer coupled, and many of them drive headphones quite well.
post #3 of 6
Thread Starter 
Quote:
Originally Posted by audiowize View Post
Yes, the output impedance would be insanely low, which is just fine. Likely the preamp output mod would just be adding a set of RCA jacks on the back that tie into the headphone jack. It is also possible that there is a higher impedance tap on the output transformer that he could use.

Either way, some of the nicer tube preamps out there are transformer coupled, and many of them drive headphones quite well.
Thanks audiowize... what does an extremely low impedance imply for a pre-amp?
post #4 of 6
Preamps can have output impedances from as low as a couple of ohms to as high as 10k. Back in the early days of tube gear, preamps would deliver the signal to power amplifiers right off the plate of any number of different preamp tubes, creating an output impedance well over 10k. Standard amplifier input impedance these days is 10k, and the output impedance of many current tube headphone amplifiers should be somewhere between 2 and 300 ohms. This allows you to drive a given power amplifier with a long run of cabling and no worry about an impedance mismatch.
post #5 of 6
Thread Starter 
Quote:
Originally Posted by audiowize View Post
Preamps can have output impedances from as low as a couple of ohms to as high as 10k. Back in the early days of tube gear, preamps would deliver the signal to power amplifiers right off the plate of any number of different preamp tubes, creating an output impedance well over 10k. Standard amplifier input impedance these days is 10k, and the output impedance of many current tube headphone amplifiers should be somewhere between 2 and 300 ohms. This allows you to drive a given power amplifier with a long run of cabling and no worry about an impedance mismatch.
Great, thanks! You sure know your stuff...
post #6 of 6

Okay, I'm a newbie. I just ordered the wa6, I have the Fiio 9/17 combo and am wondering the best linkage of these or even if this is a good idea. Jack says the fiio combo will work with the RCA out but didn't go any further. Any advice would be awesome.

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