CCA LA 1D Vari Mu limiter..any info on this ?????

If you want a non-funky high-level limiter, 1.6 pounds won't be great.

In Edcor, you'll contact them for a 5W or 10W core wound 10K-20K to 600. Cost about $60 for the part and they may add a small custom charge.

Yes, might have to get Edcor to do the custom job, maybe some more folks would be interested?

130 bucks for a single Sowter before shipping from the UK does not equal a ghetto build in my shop

I've got a couple of Edcors 8K to 600R, 10W on order for a dual channel gates/teletronix thingo.
Edcor 600:15K input traffos and 15K:15K interstage.
Edcor PSU traffo as well!

Using bits and pieces from various designs.

But basically a sta level/175b with variable threshold and time constants.

Regulated vari-mu and sidechain rectifier, dc regulated heaters.
Pair of 6V6s for output, 6BC8 (initially!) for vari-mu and 6922 or so in the middle.
EZ40 rectifiers x2 for seperated HV each channel.
Triplett meters and maybe somekind of balancing test setup
Point to point wiring (of course!)

I'm sure it will all work together great!

Can't wait to hear it.

I think I want to experiment with one of these as well.
I'm gonna grab the output from sowter.
What do you guys suggest for:
T1 (maybe the Allied 6K7VG?)
T2 (sowter 1009?)
L1
What is R36 doing in this circuit?

R36 is a T pad.  That's how they are drawn. 

Voltage will be high with that transformer, and current is far more than required.  I'd dig through the Edcor list. 

emrr said:

Voltage will be high with that transformer, and current is far more than required.  I'd dig through the Edcor list. 

Click to expand...

Thanks for the tip! I'll bet the Edcore XPWR103-120/240 would do the trick. and I'm assuming the 15V or 5V taps would be fine for the heaters?
Is there any specific value on that T-pad? or can I use one of those 600r T-pads from hairball?
Great idea about adding the original and LA-1D release times on the rotary switch. Love that!
Would R27 be the threshold adjustment? (this is my first tube project beside the Drip "paint by numbers" la-2  ;D )

r27 is threshold and ratio.

test:  can you think of a reason the T pad would be anything other than 600?  They also make T and L pads for speaker use. 

Last I saw BO-2 outputs didn't sell for a whole lot.  You just might have to wait awhile to find one. 

Dustbro, the Edcor XPWR014 looks better to me, you need a 6v winding if you're going with regular AC heaters (I would). With that transformer you could also use a 5v rectifier tube since the winding is there.

emrr said:

test:  can you think of a reason the T pad would be anything other than 600?  They also make T and L pads for speaker use. 

Click to expand...

damn.. I would have studied if I knew there was gonna be a test  :'(
Ok... so 600r for audio and 75r for video  http://en.wikipedia.org/wiki/T-pad

great!  thanks!

pH said:

Dustbro, the Edcor XPWR014 looks better to me, you need a 6v winding if you're going with regular AC heaters (I would). With that transformer you could also use a 5v rectifier tube since the winding is there.

Click to expand...

I guess I bypassed that one cause I was looking for a 310-0-310. I'm gonna give theXPWR014 a shot. Thanks!

Are C17, C18, C19, and C20 really 220uF film caps? Thats huge!
Anyone have a source for them?

What are the specs of the meter? I see it says SUNSHINE on the top, but i cant find any info on it.
TIA

Are C17, C18, C19, and C20 really 220uF film caps? Thats huge!
Anyone have a source for them?

Click to expand...

those seems like polarized caps.

even the time constant caps are drawn polarized.
in fact they are (or at least drawn) the same all-over.

interesting to see those 220uF caps on the grids of the 12BH7 - what are they for?

pfd

1 mA

ahh....makes sense now

emrr said:

pfd

Click to expand...

Ahh... thank you sir.
so those are the silver mica caps that I see in the guts of your pics. Can I assume that everything else in schematic is uF? The designers note is unreadable for capacitance.

Would a Sowter CB24 Pi Filter Choke work in here? It's 18 Henry 70 mA

There are cheaper options without international shipping. Maybe this:

http://www.mouser.com/ProductDetail/Hammond-Manufacturing/159M/?qs=sGAEpiMZZMvn9JuIWNFwexF9SA%2fRRECh

Final pics.

for V2 and V3, is this schematic saying that pins 4+5 are tied together and get one side of the tap, and the other side is going into pin 9 (heater center tap)?
thanks!