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 NEW  Matt presents bias and operation data for the 6V6 tube in SE operation - 6V6 Single-Ended (SE) Ultra Linear (UL) Bias Optimization.

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It is currently 10 May 2021, 22:52

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PostPosted: 19 Feb 2021, 02:48 

Joined: 01 Jul 2020, 11:33
Posts: 6
Can this amp drive a planar headphone that are 25ohms 91db/1mw sensitive? Do I need to make some changes to the part values used?

PostPosted: 05 Apr 2021, 12:13 

Joined: 04 Apr 2021, 08:44
Posts: 1
ILoveHiFi wrote:
Matt911 wrote:
Hi there
I am looking to use this amp as a preamp in my hifi system, this will go before my power amp of course. Will I still need the MOSTFET and lM317 as a for the current gain and constant current source if they are not directly driving the headphones?
Anything else I should look out for when using in a hifi system?
Thanks in advance! Great circuit cant wait to build! Thank you so much for all the time and effort put in!

As a pre amp, you do not need the mosfet and lm317.
You directly connect a hifi cap at where r3 4k7 joins 12au7, at the output of the cap, you put a 100k to ground instead of the 1k.
You measure output voltage dc to be zero at your pre amp before you connect to power amp.

Hi I am also keen to try this as a pre amp. Can anyone suggest a good value output capacitor to go with the modified circuit utilising a 100k please? Some values mentioned in a previous thread but I was not clear it was concerned with changing to a pre amp.

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