ADA4627 for sure!

Quote: Good to hear you got it!

I found one in ebay @35Euros each.Try to search the ketwords"ALPS Motor Poti Motorpoti Quad Potentiometer 50k log 850555".Enjoys!

I faced the same problem be4 in my SOHA ii when using OPA627 so i tried back OPA134 and i solved all the questions.The main reason i think is the "too" high slew rate for some opamps such that it was too "sensitive" to compensate to the DC offset.BTW,try to let the output transistors warm up for...

try to use another model of opamps for dc servor

50K 25steps Pot :D

Hi all!I m building a SOHA ii but got some problems for the buffer DC offset.Please advise.   I used 1.5M for R15, Q6,Q7=2SC2238 from TOSHIBA, OPA627au for both opamps Ibias =100mA(Voltage accross R10(2R2) is around 220mV) V+ = 15V V- = -14.95V and no tube is installed for...

SOHA II?

SOHA I AMP with Mullard 12AU7 Square Getter~

What did you get from HK?

   

My SOHA 1 with 12SN7

Quote: Thank you so much.

     

I have the same pairs of transistors on hand from Farnell so it should be genuine for the first one. 

6AS7 Headphone Amplifier Hi,i just got my HD650 last week and want to build a cheap good amp to drive it nicely.I have searched for the circuit on the internet and found 2 circuit which is somehow close to my preference.Also,i found the tube amp Darkvoice 336 also use this tube combination.So...

Here is my modified SOHA VR1 and VR2.

VR1 =12V Fixed Regulator 78L12 So it would not be higher than too much than 12V unless you connect the pins wrongly. Try to take a look the pins definition on the datasheet and also see clearly how people place the 78L12 from the following pics.

demand & supply

Take a look. I can't feel any interference/noise from the PSU.

Quote: Originally Posted by fraseyboy Damnit... I cant really listen to music in the room my computers in. It doesn't work for some reason. I just can't focus on the music and instead of listening to it, I just hear it. But thats were all my equipment is... The room is too small to...