Quote from: aquataur on November 07, 2025, 05:05:11 AMWhat are you trying to protect your input from? Electrical damage?
I guess you are trying to protect from artifacts that are bad sounding.

Bingo!

QuoteFor a predominantly clean system, op-amp clipping or -latch up might sound unpleasant and distracting. In this case, a fast acting limiter would be the cure. But then, how much headroom does this one have...

This one is supplied by ±10.7 or so volts, due to use of a ±12V power supply from an old computer, which is rather noisy so I add some filtering, and that drops the voltage some.  If I ever build this circuit proper, I'm going to use proper power transformers and regulators to make ±15V, which just may solve my problem, don't know yet.

QuoteFor a distorted system, subsequent distortion stages would mask everything.

I beg to differ; For various reasons that I don't have time to explain, in the past I found myself doing tests attempting to find out if rail-clipping (in particular) leaves a "fingerprint" on the tone that you can hear even through a subsequent clipping engine.  I don't know how or why, but it does.

QuoteFor benign "bounding", a string of zener diodes (anode to anode) with a 100R dropper resistor in series with the input would do the job, as Merlin has used it here.

Even on a clean system, a such limited transit would likely go unnoticed.

You know, I had thought of doing soft-clipping with Zeners (because they are made for different voltages, so you don't have to "stack" diodes to get your desired headroom), but wasn't sure how to implement it.  Here you've provided the solution; I'll search around for more info on this arrangement, thank you!

Here it is
You cannot view this attachment.

Junkman,
 I know this topic is old, but I just purchased a Baldwin C2 amp and I'm looking for a schematic also.  Did you find one.  The above link is no longer active.  If you have one, or if anyone knows where I can get one, I would really appreciate it.
Thanks,
Chuck

Too much fun

Just had a cow looking at the collector which appears to be touching the heatsink 

Anyhow I did some more continuity tests and I think it's ok but yeah gonna have to pay attention to stuff like that

You cannot view this attachment.


EDIT:  note to self.  Next time you need to bend the legs 90 degrees approximate the horizontal distance needed then find a nice firm sharp 90 degree edge to use as a die
Because it also messes up trying to solder when legs are coming through the hole at an angle SMH

EDIT 2: Maybe instead of nice sharp 90 degree edge I should have said nice CRISP edge.  Like when I used to be in Alberta and when I got cold ❄️🥶 the locals would say "She's getting CRISP" 

Ok
Got my transistors in yesterday so today didn't have a lot of time but hey onward we go

Anyhow wife gave me too much coffee so I had some hella jitters trying to get this in

Also I verified pinout etc

You cannot view this attachment.

And the ugly truth

Oh yeah that nut that was glued to the board and fell off added to the entertainment

You cannot view this attachment.

I did not have tons of confidence in this install so I checked for continuity but fingers crossed apparently no solder bridges

So now just waiting on my capaci-TATERS   

...yep, it was the Master Volume pot; the first one I measured. It's an A500K and it measured in the millions and fell apart when I removed it. Thanks for the suggestions! You cannot view this attachment.

Sorry, I was looking at the V1 schematic. This  is V3, a lot different, though  still suspect a bad pot.

You cannot view this attachment.

Quote from: dmeek on November 06, 2025, 09:36:25 PMPossibly a bad Volume pot R11 or cracked solder connections on this pot.

Thanks, but on this board R11 is an SMD component. I'll inspect the master R134, gain, drive and level R23, R51, R68.You cannot view this attachment.

Yes sir thanks also I think I learned 1H means 50 v DC 

What are you trying to protect your input from? Electrical damage?
I guess you are trying to protect from artifacts that are bad sounding.

For a predominantly clean system, op-amp clipping or -latch up might sound unpleasant and distracting. In this case, a fast acting limiter would be the cure. But then, how much headroom does this one have...

For a distorted system, subsequent distortion stages would mask everything.

For benign "bounding", a string of zener diodes (anode to anode) with a 100R dropper resistor in series with the input would do the job, as Merlin has used it here.

Even on a clean system, a such limited transit would likely go unnoticed.