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Pass Citation 12
Pass Citation 12
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Old 5th November 2013, 03:50 PM   #51
electrochap is offline electrochap  Canada
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Join Date: Jan 2008
Location: Montreal, Quebec
Default Pictures

Here are some pictures of my recently acquired CT11 and CT12. I'm almost shy putting the iron on these... They are both completely original, not a single wire moved... Both no rust, corrosion, oxydation, nada... Working like new; not a scratch, pots are clean.. etc...
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File Type: jpg photo 1.JPG (102.7 KB, 293 views)
File Type: jpg photo 2.JPG (105.4 KB, 287 views)
File Type: jpg photo 3.JPG (137.2 KB, 282 views)
File Type: jpg photo 4.JPG (91.0 KB, 276 views)
File Type: jpg photo 5.JPG (105.2 KB, 270 views)
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Old 29th October 2015, 06:36 PM   #52
cucuclock is offline cucuclock  France
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Join Date: Dec 2012
Location: Paris
Hey Electrochap,
this is quite old thread but maybe I have an answer here. I'm using a couple of Tazz board for C12 Mod and Bias setting is always a scaring point for newbie, at leat for me..on your schematic and pcb it seem clear but I would like to be sure:
If I understand Right, At the initial Turn On the screw of the variable resistor R17 must be in COMPLETE COUNTERCLOKWISE position?
This is the schematic. Thank you
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File Type: pdf HK CITATION MF12C.pdf (17.4 KB, 65 views)
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Old 29th October 2015, 08:09 PM   #53
electrochap is offline electrochap  Canada
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Hey CUCUclock, actualy I've never built the CT12 with Tazz boards even if I have the whole kit (including the Coroidal trannys, FETs, caps everything) in a box on a shelf ...

The one I've built uses old Hitachi Mosfet (J50, K135) which are laterals and are not biased like IRFs.

If I were you, I would just start at midpoint with a meter watching and adjust wherever you have to go. Slowly. But I'm sure there are way more knowledge people on that Forum (like Tazz and others) who will answer your question knowing exactly where to start... Sorry, I leave this one to others.
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Old 30th October 2015, 10:23 AM   #54
cucuclock is offline cucuclock  France
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Join Date: Dec 2012
Location: Paris
Thank you Electrochap, it's a good starting point
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