I have nothing of value to add here yet, but I've been wanting to build a Sta-Levelish for awhile and love that this uses such a basic (and cheap) all-octal tube compliment. I'll be tinkering with this circuit when I get some free time (probably sans the M/S functions). But please keep us posted about your progress! I'm recentish to the forum and gather that Ian's PS PCB's are long sold and not in the group of files he generously open sourced. Does anyone know if those are available anywhere or if there's a similar solution floating around? They would be handy for a couple tube projects I'm sketching out. Thanks!
PureAnalog M/SLevel Vari Mu Compressor (manual + schematic)
- Thread starter zzzzz
- Start date
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scott2000
Well-known member
Maybe check out ghr.fi
rock soderstrom
Tour de France
Thanks!
chrispbass
Well-known member
Ok, so quite taken with the idea of this one (thank you @zzzzz) and gathered some parts over the last few months. Decided to have a couple of hours today to start roughing it out on ones chopping board.
I’ve had 2 nice Earnest Turner 1mA meters in the parts drawer for eons…and they need a home.
Plan is to make a stereo pair. I’m going to adapt a PSU pcb I’d designed for another project, run DC heaters and generally/hopefully upgrade the psu.
Regarding Tx’s, I’m thinking of using a UTM on the output 15K:600
https://utmindustry.com/utm3580/
And try an oep A262a3e?? Or 1:4 on the input.
I need a 15k:600 for another project and have Oep’s and 1:4 in the parts drawer so not too much of a gamble in that respect.
Thoughts?
I’ve had 2 nice Earnest Turner 1mA meters in the parts drawer for eons…and they need a home.
Plan is to make a stereo pair. I’m going to adapt a PSU pcb I’d designed for another project, run DC heaters and generally/hopefully upgrade the psu.
Regarding Tx’s, I’m thinking of using a UTM on the output 15K:600
https://utmindustry.com/utm3580/
And try an oep A262a3e?? Or 1:4 on the input.
I need a 15k:600 for another project and have Oep’s and 1:4 in the parts drawer so not too much of a gamble in that respect.
Thoughts?
Mine has OEP’s on the input (I think) in the shielding cans they sell for them. The builder went to great trouble to obscure them. They sound good.
It’s really a great sounding unit as is. I use it nearly every day (almost always in mid side), to the point where I can’t find any downtime to rip it apart and rebuild the PSU lol…
chrispbass
Well-known member
I’m building without the MS matrix. Given the range of Oep’s, I think the a3e is the most likely candidate…But I could be wrong. DC resistance of primary and secondary would confirm if you have a mo.
Also ordered some of your “api” make up gain boards Z…thank you again
chrispbass
Well-known member
I wouldn’t go that farso I'm thrilled that sometime else smarter than me is taking it on first.
, but I’ll do my best! Will be interesting for sure.As you can see, it’s just being ‘bread boarded’ for now, before committing to a case etc. I’ve got some tag board/strip coming this week so I can get on wiring up the main circuit PTP, and that’ll be a a new experience for me.
Next manoeuvre is to fashion a bracket for the valve bases from some aluminium angle in readiness for the PTP work.
