SemiSouth power Jfets .......... FW J2

[Zen Mod]

[sp300b]

Eager to hear Tea's and generg's experiment results

[Zen Mod]

poof ............ :sarcastic_hand:are you sure you don't need 1R MOX-es ?

[sp300b]

poof ............ :sarcastic_hand:are you sure you don't need 1R MOX-es ?

It's a Christmas time...everybody likes it

[generg]

don´t disturb me in my contemplation....... :character13:to MOX or not to MOX.....amp is in revision 21 ....... the potential is big!

[sp300b]

amp is in revision 21 ....... the potential is big!

Waiting for revision 33

[Zen Mod]

don´t disturb me .....

Fly High ........

[generg]

Fly High ........

I want stratospheric sound .......

[generg]

what I can say very clearly the sound changes clearly when you change the type of C3/C4. I tried it with Elna Simic II and with Panasonic FC.most of you know the differences, Elna is "Wodka" and "Blues" and "I am getting older" an Panasonic is champagne and "more drive" and "I feel Young".you can choose fitting to daytime, Elna in the evening and Panasonic in the morning don´t do it vice versa.....

[Zen Mod]

moi having industrial ELNA there ( 125C) bypassed with MKC

[generg]

Hi Zen Mod,Below C4 is a X in the line, is there any meaning I do not understand?

[Zen Mod]

schematic is drawn in Eagle , as necessary step for pcb constructionthat's iterative process (back and forth) so - few things ( not necessary in "just" schematic file ) are there - as several PSU taps , same as few wire bridges ( dracht brucke)that X is from these reasons therejust ignore thator solder banana plug there , just for fun:rofl:

[generg]

Yes I am Banana Joe!

[Zen Mod]

you guys are killing me ...... in mysterious ways

[Tea-Bag]

So update. No listening yet. My large offset got cured by a huge resistor change from default of 390 to 2k with 500R pot.What bothered me more, was now the bias was up to 720mv. I swapped the resistors out of the other channel, and offset from +1v was easily dialed in with R12. Bias at .560mvSo I am thinking that at the bias change has somehow made the Fets less matched, as they do with different levels of current.I am going to swap out with my last matched pair on this channel, go back to basics for R26 and see how this goes.

[Magura]

So I am thinking that at the bias change has somehow made the Fets less matched,

No more Glühwein for that gentleman!Magura

[sp300b]

So update. No listening yet.

Does it looks better, now, at least ?

[Zen Mod]

......

Tea - what voltage you have across R23 ? (just in case - what's value of R23 on your pcbs ? somehow I lost the track with you all )

[Tea-Bag]

Tea - what voltage you have across R23 ? (just in case - what's value of R23 on your pcbs ? somehow I lost the track with you all )

I have not checked it since swapping Power resistors to sp300b's values.The resistor should be 47R. I will check the value later, before swapping out R100's.

[Tea-Bag]

Does it looks better, now, at least ?

Look better, no - my amp's are all ugly. I tried to boot up laptop for some test music last night, blue screened and core'd. Several times, so I just went and played X-Box with my son.

[Magura]

Look better, no - my amp's are all ugly. I tried to boot up laptop for some test music last night, blue screened and core'd. Several times, so I just went and played X-Box with my son.

Youth these days :rofl:Magura

[generg]

No more Glühwein for that gentleman!Magura

I am afraid I have to send tea-bag some bottles of Glühwein to help him this frustrating job to do ......