B1 Xformer

[Soundhappy]

What's wrong with the kiss,boy ?

Thanks ZM! What we see on BAF2017 video is one Mr. Pass builded example. It's with RCA single signal inputs.
What amazed me was construction minimalism.
Simple twin RCRCRC external psu noise filter, two volume pot's, input resistors, two pairs of jfet's,
two trimmers, 6dB or 12 dB jumper and two xformers.
Source selector is made with two position switch.
Yeah, no capacitors inside signal path!
Ok is not Super Symmetry( SUSY) , balanced but easy to make with few components from "treasures box"

 

[Zen Mod]

Papa is cheapskate

proper ones are made complicated , cubic meter box full of yadayada parts , all that for pair of JFets feeding tiny xformer



(and yes, balanced one is SUSY)

 

[Soundhappy]

Burning Amp 2017 - Nelson Pass

Let's visualise video about B1 XFRMR

 

[vdi_nenna]

Is there a resistor required after the trim pot in schematic in post 1 of this thread?
B1 R2 has a 100 Ohm or lower value resistor.

Thanks.

 

[Zen Mod]

absolutely not needed

in fact, thing to avoid

 

[vdi_nenna]

Perfect.

I have a friend with the B1 R2.
Should the value be removed there as well or lowered?

Thank you.

 

[Zen Mod]

0R

means short

 

[vdi_nenna]

20 to 50 ohm ok?

 

[Zen Mod]

no

0R

you don't need to increase Rout of buffer, feeding that autoformer

 

[vdi_nenna]

Ok, I took "short" to be a problem.
So zero ohms is ok.

Thx.