BA-3 As Preamp

[buzzforb]

I love my 6V6 pre! I need something decent as backup when I make some changes to it.
I managed to get one channel to 2mV and the other to 5mV before the caps, could do better though. But I was afraid to leave without them. Do you think it' s safe to go without them?

I wouldnt try it without balanced(plus a minor modification.) 6V6 is wonderful. If using the BA3B as a preamp, you have to tune it carefully or it will add too much of its character(even at reduced distortion tuning) to the final package. It did not mate well to J2 or Funny^6 when used as standalone. Funny that it works best with a buffer on the output

 

[vgeorge]

off topic ( but who cares ) - which stacking arrangement you prefer with that AVC and - exactly in which configuration (preceding stage , next stage )

?

I use it at the output of my #26 pre. So far only tested at stock value of 20H but I want to try 3x3 at about 150H. The thing is too much hassle with all this wiring, but will do it some time soon.

 

[vgeorge]

I wouldnt try it without balanced(plus a minor modification.) 6V6 is wonderful. If using the BA3B as a preamp, you have to tune it carefully or it will add too much of its character(even at reduced distortion tuning) to the final package. It did not mate well to J2 or Funny^6 when used as standalone. Funny that it works best with a buffer on the output

Thanks Buzz. So was right not to use it without caps in single ended.
I will have a look at the BA3B thread also.

 

[Zen Mod]

it works pretty well , as described here : AVC & Input Selector for Papa’s Koan M2 ; temporary case ? | Zen Mod Blog

even buffer-less , I like it much more then expensive TKD pot , which was previous solution

 

[vgeorge]

Agree, tried it without buffer and it was more natural. Probably put them in a box by themselves, in order to be more flexible.
If you have a certain preference about stacking arrangement, let me know.

 

[Zen Mod]

for now , this is most informative : :: View topic - play airgap of autoformer volume .

as soon I put buffer in there , will try .....

 

[tinitus]

since it is originally designed to drive BA- power buffer amp I suppose that have more or less determined the supply voltage

but is it also optimal voltage for preamp use ?

and I better not ask how it would work if output mosfets were replaced by another jfet pair

 

[tinitus]

UPS ... I forgot, Juma have shown several versions of that ... sorry

if I build the BA-3 pre stage it would because I wanted the gain, and I might

but what is the point without the gain (just curious)

 

[Ryssen]

and I better not ask how it would work if output mosfets were replaced by another jfet pair

Any links to that?

 

[tinitus]

Any links to that?

tricky(difficult)

but easy to just post the schematics hope that is ok

 

[Ryssen]

Ok

 

[Zen Mod]

even if that's similar , it isn't anything like BA3 FE

and I'm pretty sure that Juma didn't wrote it is

 

[generg]

it works pretty well , as described here : AVC & Input Selector for Papa’s Koan M2 ; temporary case ? | Zen Mod Blog

even buffer-less , I like it much more then expensive TKD pot , which was previous solution

May I ask you which TKD pot….?

 

[Zen Mod]

some expensive drek , 4 x 10K , conductive plastic , of course

that was Geschenk from my Personal Wakoo Froggie

there is definitely something wrong with Moi - ppl are giving me Geschenks , even if I'm mostly not worthy

 

[tinitus]

even if that's similar , it isn't anything like BA3 FE

and I'm pretty sure that Juma didn't wrote it is

no, he did not
and I never said he did
probably accidental mistake on my part when I asked for such a design, and suddenly remembered these curcuits by Juma

they are probably from a thread about 'alternative' preamps for F5
and yes, they are off topic
please ignore

 

[Zen Mod]

they most certainly are

pretty important virtue of BA3 FE is lack of overall feedback , while both of these stages are more like F5 , with feedback connected in more common manner

they're both great specimens , I'm just making distinction to BA3

 

[tinitus]

pretty important virtue of BA3 FE is lack of overall feedback , while both of these stages are more like F5 , with feedback connected in more common manner

and I suppose it is not possible to ... ehh ... I suppose better not ask

 

[generg]

only for amusement BBA-3 with F5 feedback…..

 

[buzzforb]

Other options as well

 

[Zen Mod]

PL

Papa's Legoland