My Blanced Line stage pre amp

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My Blanced Line stage Pre amp

coupling capacitor is M-Cap 10uf + solen MKP10 0.1uf
registor= dale , holco
 

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very nice work, the wiring is beautiful.

the only thing i would reccomend is a second transformer, it looks
like you have the room for it. And maybe bigger heatsinks for the
FETS on the power supply board... they tend to get quite hot.

oh, and blue LED's (sorry, it had to be said!) ;)

i wish i had the know how to implement a volume control like that!

looks great :) thanks for sharing the pics
 
bzls testing?

Andy:

I also finished my BZLS and have completed the boards. I blew the board once, because the wrong connection. Now, I have fixed the boards. I have my PSU output to +/-60V, but how do you test the main board w/o connecting the wire?

I use the multimeter to measure, the only problem is that Z1, Z2 in both channels have different resistance value (R ch is 3 times higher than L ch). Is this the right way to test it this way?

Can you post the details photos of all the boards (or zip it up for us to download)?

Thanks

Thomas
 
detail photo

hi..tomchaoda

I was made 100% same pcb work to Pass diy project from
http://passdiy.com/pdf/balzenpre.pdf

this photo is first version line board.
after i replace some parts ( resistor , capacitor )
FETS and zener diode are same part

My PSU out put to +59 , -60V , but its no matter
i think Z1,Z2 zenor is just protect to input signal
so please check about some resistor and FETs
As a matter of fact i didin't know exactly...^_^

good luck tomchaoda

thanks

Andy
 

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