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weiss

Re: the Poor Man 660 support thread
« Reply #3160 on: September 26, 2014, 10:22:36 AM »
WIP (thanks to frank for the front panel)



« Last Edit: January 24, 2015, 04:39:13 PM by weiss »


MicDaddy

Re: the Poor Man 660 support thread
« Reply #3161 on: September 26, 2014, 03:32:04 PM »
weiss, sexy front panel.  Output shorted wide open?  <----(edit)  wrong project... reading too much D-AOC  ::)

Getting ready to finish this rework monster... lots and lots of rework ugh  ::)

Speaks to how robust [Silent:Arts] pcbs are, not a single pad lifted. 

For those who need to ever remove those big heat-sink bastards:

Turn you iron up to 11 (actually I think mine was ~700f) dial on the 936.

Remove any hardware (nut/screw) tying TO-220 etc to heat-sink

Hold the heat-sink with non soldering hand, put some tugging force on one end and apply heat to the pad on the underside on the same end.  It will give just a tad.  Let cool.  Do the same on the opposite side.  Rinse repeat. 

I was able to remove these in a matter of seconds with no damage.

Did the same for the big 10uF caps.  They actually came out with minimal effort (turn the iron down for this one).


« Last Edit: September 26, 2014, 10:17:50 PM by MicDaddy »

duantro

Re: the Poor Man 660 support thread
« Reply #3162 on: September 26, 2014, 08:25:03 PM »
That is a beauty Weiss! How does it sound?
Micdaddy- looks like you have it all laid out and ready! Is that the m670 schematic on the bench?

MicDaddy

Re: the Poor Man 660 support thread
« Reply #3163 on: September 26, 2014, 09:41:21 PM »
duantro Ya I'm going to try the M670 beings I'm this deep into rework already.

All transistors were thermal pasted directly to heat-sinks, some few mis-designated bits, all sockets were plastic, the PSU has basically become a boneyard as I'll try the other PSU.   This project was from a trade and it came like this.  Good thing I read the thread prior to trying to power up  :o

Been hanging on to this a few years now and your guys' recent posts on getting it going have inspired me to try learning wth I'm even doing and make it happen.  Getting there slowly.

Did you go T-pad + pots for threshold/output?  I'm thinking T-pad + stepped switches for threshold & output but not set in stone. 

(edit) again with the "output"... can you tell I've read the D-AOC thread a bit much lately
« Last Edit: September 26, 2014, 10:24:55 PM by MicDaddy »

duantro

Re: the Poor Man 660 support thread
« Reply #3164 on: September 26, 2014, 10:03:11 PM »
Nice! Good luck getting it going.  I originally had switches  all around but now I'm using tpad at inputs and switches at thresholds.  Been working good so far.

MicDaddy

Re: the Poor Man 660 support thread
« Reply #3165 on: September 26, 2014, 10:17:04 PM »
duantro, how did you build/buy your switches?  Is there a sweet spot for the threshold or is 15-25k log sufficient?

duantro

Re: the Poor Man 660 support thread
« Reply #3166 on: September 26, 2014, 11:16:16 PM »
duantro, how did you build/buy your switches?  Is there a sweet spot for the threshold or is 15-25k log sufficient?

I used silent arts excel sheet for 15k stepped switch  calculator at the first page meta post. Works good. Kingston's post there also describes a good method. I haven't disliked mine enough to change them!

weiss

Re: the Poor Man 660 support thread
« Reply #3167 on: September 27, 2014, 02:49:31 AM »
weiss, sexy front panel.  Output shorted wide open?  <----(edit)  wrong project... reading too much D-AOC  ::)
That is a beauty Weiss! How does it sound?

thanks guys, still in work though. Need to wire and calibrate this thing first, then i can tell ;)

duantro, how did you build/buy your switches?  Is there a sweet spot for the threshold or is 15-25k log sufficient?

i used 25k stepped attenuators for threshold and input gain

weiss

Re: the Poor Man 660 support thread
« Reply #3168 on: September 29, 2014, 10:25:22 AM »
can anyone help me wire my attenuators? i can't find the corresponding terminals..

this is how it looks:

and now this is what the wiring guide says:



which relays did you use for the bypass boards?
« Last Edit: September 30, 2014, 07:58:29 AM by weiss »

duantro

Re: the Poor Man 660 support thread
« Reply #3169 on: October 03, 2014, 09:10:53 PM »
can anyone help me wire my attenuators? i can't find the corresponding terminals..

and now this is what the wiring guide says:



which relays did you use for the bypass boards?
Looking back to post 3156 by Mitsos....
I think the actual resistor value for each step is the last value in each line.  Kingston says the total R is 15K.  It's like a pot/ voltage divider like a volume pot.  Signal goes in on top and out the wiper, other side (in the volume pot example) goes to ground, but here the two "pots" connect together and is where the control voltage goes. 

Anyway, between the CCW position 1 and position 2, is where the 1191R resistor goes.  Between pin 2 and 3 should be a 309R, pins 3 and 4 a 183R, and so on til you get to the end of the each section. Signal would go from the trafo to last pin (CW) of the respective switch sections, the first positions (CCW) would connect together and go to CV and the poles of each switch go to the grids of the valves.
I'll include a diagram that someone else posted somewhere in the thread. Their values are slightly different than Mitsos is explaining, but it should help some to visualize the layout.
I used Igor's old bypass relay boards with DS2E-M-DC12V relays. There isn't much too them. PM me if you'd like the schematic to breadboard your own.


weiss

Re: the Poor Man 660 support thread
« Reply #3170 on: January 02, 2015, 05:58:59 AM »
thanks duantro!

Re: the Poor Man 660 support thread
« Reply #3171 on: February 13, 2015, 07:45:25 AM »
 :) I changed the circuitry of the Time Constant pot to a six pos Switch with a much bigger (faster) timing range possible. I completely took the 10k Pot and the 10uF cap out and replaced it with the 6 pos switch. One end goes directly to the out of the two diodes from the controlvoltage rectifier. The other one goes to the middle pin of the attack socket (wher the pot normaly is connected)
Pictures attached. the timing range goes from 10 msec to 0,5 seconds. I was smashed away by the achievable soundresults!

Re: the Poor Man 660 support thread
« Reply #3172 on: February 13, 2015, 07:49:46 AM »
here is the schematic without the 10k Pot and the 10uF cap. the upper wire goes to one end of the 6 pos switch, the lower wire to the other end ;-)

Re: the Poor Man 660 support thread
« Reply #3173 on: February 13, 2015, 07:51:01 AM »
and here it is:

Re: the Poor Man 660 support thread
« Reply #3174 on: February 21, 2015, 09:36:46 AM »
here we go :-)


 

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