B1 Rev. 2

[vdi_nenna]

This cool schematic can be found in the middle of two threads.
I though it should be easily found. 🙂

 

[6L6]

That buffer block is the basis of ZenMod's "Iron Pre". Prototype PCB for the store have been ordered. 😀 😀 😀

 

[marc brown]

Sweet! Wonder how it sounds compared to B1 rev 1 and BA3 Pre?

 

[6L6]

Not sure if the BA3 would be a reasonable comparison, as the B1 variants are buffers and the BA3 has gain.

That said, I'd expect the B1 Rev2 to sound better than Rev 1, but I haven't yet heard it, I just like complimentary pairs better...

 

[vdi_nenna]

Followed by a step by step illistrated build guide? 😀

 

[6L6]

Of the Iron Pre? Of course.

I'd like to build one of these B1 Rev2 and have a listen.

 

[Zen Mod]

I can write something , when time permits

I can even make build guide , after that

regarding B1 vs. B1 v.2 ....... there is no fair comparison , just because Pa needed to include series output resistors in both of them , as idiotproof part

both will work better without it , when heavier load is in question

while difference in sound , when load isn't critical (v.2 having half Rout of v.1) is certainly matter of taste

 

[marc brown]

I can write something , when time permits

I can even make build guide , after that

regarding B1 vs. B1 v.2 ....... there is no fair comparison , just because Pa needed to include series output resistors in both of them , as idiotproof part

both will work better without it , when heavier load is in question

while difference in sound , when load isn't critical (v.2 having half Rout of v.1) is certainly matter of taste

Can competent DIYers remove to improve the sound? Which resistors?


Sent from my iPhone using Tapatalk

 

[Zen Mod]

R105 in above schematic

make it just few ohms

 

[jean-paul]

Just a few Ohms ? Are you sure this is good advice ?

 

[Zen Mod]

analyze

what can happen ?

 

[2 picoDumbs]

This cool schematic can be found in the middle of two threads.
I though it should be easily found. 🙂

Good idea.

 

[wdecho]

I have built both the R1 and R2. I much prefer the R2 version. I use the R2 version for my FW builds not needing any gain from a pre with my horns. An easy perfboard build. I will add the voltage recommendation of Papa as being a 24V switcher which I am using without noise. If you are a follower of the philosophy of less is better than this in theory should leave less of a sonic signature than say the BA-3 pre. I also have the BA-3 pre and I can enjoy it's sound as well. Right now I lean more to the LSK pre for a pre with gain but it is probably more of it being a newer build. Builders have a tendency to favor a new child, at first anyway.

 

[wdecho]

I should add that I have both the BAF LSK version and I also recently built Juma's LSK version. Both very nice with a slightly different flavor.

 

[jean-paul]

analyze

what can happen ?

- Builder accidentally shorts an output to GND

- Builder uses shielded but slightly capacitive cable.

 

[Zen Mod]

not critical

 

[vdi_nenna]

Hey, regarding R101 and 102. They are for switching thumps?

L2 is an LED?

Also, for the power supply section, that's a virtual power supply correct?

Just want to clear these things up before this thread gets too deep.

Thanks,

Vince

 

[Zen Mod]

yup
yup
GND is virtual prior to connecting PSU to voltage divider ...... then GND is no more virtual

as I'm always saying' - GND is state of mind

 

[vdi_nenna]

Last but not least- C2 and C3 should be the same. 3300uF is fine.

 

[2 picoDumbs]

Yep