[Blooze]

I picked up an old Hagerman Clarinet PCB a while back and am building out using offboard RCA jacks. I've traced the inputs to the selector switch and outputs to the output jacks (drawing attachment). If I look at the stock RCA jack assemblys though, it looks to me like the R/L switch at some point (solder pad on the input doesn't correspond pattern wise on the PCB with the output pad). I'm probably reading it wrong, but if someone with better eyes than me could take a look I'd appreciate it.

I know there have been a handful of folks who've built this preamp over the years so I'm hoping they could clarify, even if it's been a hot minute (15 years).

[Tubefly]

Just wondering if you have Jim Hagerman's permission to post this in a public forum?

[newzooreview]

You're asking if someone has permission to post the schematics that are provided on the Hagerman website for a DIY Kit that Hagerman no longer sells?

https://www.hagtech.com/pdf/clarinet.pdf

Two seconds of internet searching might have been warranted before jumping in with veiled accusations.

[Blooze]

You're asking if someone has permission to post the schematics that are provided on the Hagerman website for a DIY Kit that Hagerman no longer sells?

https://www.hagtech.com/pdf/clarinet.pdf

Two seconds of internet searching might have been warranted before jumping in with veiled accusations.

Yep. It’s been discontinued for what, 15 years at least. I bought all the parts to make one except the chassis and as soon as I went to order the PCB he ran out and discontinued it back in 2012 or so. Took me until 2020 IIRC before I found a pcb for sale. He put the full manual on his site back in 2012 or so. Jim won’t help with any discontinued products afaik, either.

Now that the policing is done, any ideas about what I think I’m seeing😉

[WGH]

The manual says:
Top RCA jacks are left channel, bottom are right. Please note, the Clarinet inverts signal polarity. You can compensate for this by swapping speaker terminals.

I built a Hagerman Cornet2 phono preamp, it is fantastic. All my questions were answered and upgrade parts listed in the Hagerman Circle.
Search for Clarinet in the archived Hagerman Technology Circle. I suggest reading every post before ordering parts.

[Blooze]

The manual says:
Top RCA jacks are left channel, bottom are right. Please note, the Clarinet inverts signal polarity. You can compensate for this by swapping speaker terminals.

I built a Hagerman Cornet2 phono preamp, it is fantastic. All my questions were answered and upgrade parts listed in the Hagerman Circle.
Search for Clarinet in the archived Hagerman Technology Circle. I suggest reading every post before ordering parts.

I’ve been reading the posts and looking at pic for years. I bought all the parts nearly 15 years ago. What I’m not using is the rca assemblies that worked with Hagerman’s chassis. I’ve had the board populated for a while, but just unsure on the RCA jack connections as I’m using individual RCA jacks, not the assemblies. . If you look at the way the RCA assembly input connections  work it looks to me like you’d have to have individual Rcia jacks wired opposite of the output to follow the left/right channels all the way through. I’ve seen them wired this way as well as with the configuration matching. I’ll try to doodle up what I’m actually saying as it’s confusing to try and explain.

[Blooze]

Ok. So here's what I see. If you follow the output RCA's back to the Input RCAs.

Pins 2 and 5 are the bottom row of RCA's and the Left channel.  We'll call them White. Pins 3 and 6 are the top row and the right channel and they are red.

This tracks all the way back to the switch.

From the switch to the input RCA's: Pins 2,5 and 8 are the Right channel, bottom row, white. Pins 3,6,9 are the left channel, top row, and red.

[WGH]

I think you got it.

[Tubefly]

My apologies to the original poster. I was reacting to the text about proprietary information in some schematics. There was no intention of a "veiled threat." I was simply asking a question.

Best, Alan

[Blooze]

I think you got it.

Thanks for looking. I guess I’ll just wire the individual RCA’s to follow left/right from input to output instead of them being “swapped” like it is on the pcb.

My apologies to the original poster. I was reacting to the text about proprietary information in some schematics. There was no intention of a "veiled threat." I was simply asking a question.

Best, Alan

No apologies necessary. It’s good someone is looking out.

[WGH]

I guess I’ll just wire the individual RCA’s to follow left/right from input to output instead of them being “swapped” like it is on the pcb.

I would listen to the Left/Right Stereo Sound Test after the preamp is finished. What appears to be swapped may not be, then the only thing that needs to be swapped is the labels.
https://www.audiocheck.net/audiotests_stereo.php

In a horizontal layout like my amp, the RCA Left channel is on the Left and the Right is on the Right when when I'm facing the front panel, this makes sense to me because I can't get behind the rack to read labels. Of course if I was plugging in interconnects while looking at the back panel the L&R would appear to be swapped.




In a vertical layout like the Clarinet the Left is on the top, the Right (red) is on the bottom. The two RCA Outputs are wired in parallel so the only L&R is top and bottom.

What we need is a picture of the Clarinet's rear.

[Blooze]

This is the one place I can find some clear photos of someone else’s build using individual jacks vs the assemblies. It’s a few posts down. Notice he flipped the wiring on the input jacks as well. http://


https://www.lencoheaven.net/forum/index.php?topic=22757.90

[WGH]

I think you are on your own at this point, too many variables for me to keep track of.

A couple of guys in our audio group build electronics from scratch, they never work the first time. One guy figures out what is wrong and improves on the original design. The other guy takes his non-working project to a professional and the first thing done to it is to remove all the wiring and start new.

[Blooze]

I’ve built amps and other stuff, but it’s usually point to point, not on PCBs. It’s not a big deal, and I could just wire up one rca on the in and out and figure it out real quick. I just thought I’d see if anyone else was seeing what I was seeing.