Transformer builds?

[caiofilipini]

Thanks a lot! Those numbers will be my reference. By the way I expect to have OC71 in Q2, does Hudson replace it with 2N404A in current production?

Cheers!

Yeah, and I believe they use some Russian germanium transistors as well.

 

[mdc]

It's interesting, I've been reading a bunch of accounts of folks who've built broadcast clones, left the transformer out completely (iirc there was a period last year where that TYP-somethingsomething was unobtanium?), and they sound identical to the originals. There's probably a FSB or DIYS thread about it somewhere, but the scuttlebutt seems to be that the transformer does little to nothing in that circuit.

 

[Chuck D. Bones]

I have not built a Broadcast, yet, but my experience with that transformer in other circuits is it has shitty bandwidth and cuts off some of the bass and treble.

 

[mdc]

I've meaning to breadboard one of these

https://www.reddit.com/r/diypedals/comments/gh40xv

 

[Chuck D. Bones]

Looks like that guy does not know how to stabilize a feedback loop.

"optional, causes oscillation"
"optional, can prevent oscillation"
"trim for low resistance without oscillation"

Proceed at your own risk.

 

[caiofilipini]

I haven't seen a schematic for it, but the Greer Royal Velvet also uses a transformer. In fact, the same transformer used in the Broadcast.

 

[Chuck D. Bones]

...but the scuttlebutt seems to be that the transformer does little to nothing in that circuit.

That transformer could be used for isolation if the secondary side is disconnected from ground. Seems like a missed opportunity.

 

[jubal81]

That transformer could be used for isolation if the secondary side is disconnected from ground. Seems like a missed opportunity.

I'm surprised I've never seen anyone do a dedicated isolated pedalboard output module.

 

[Preverb]

I haven't seen a schematic for it, but the Greer Royal Velvet also uses a transformer. In fact, the same transformer used in the Broadcast.

This was one I was interested in too.