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joessportster

Anyone use Curico Modded Dynaco mk 3 ?

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Curious if anyone has used the Curico Mods on a dynaco MK 3, I happened upon a pair at a good deal. ?  I need to figure out how to check & set Bias

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Joe I used Curcio stuff many years ago but my memory is to foggy on it to help you. Contact Joe I'm sure he'll help you out. 

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10 hours ago, NOSValves said:

Joe I used Curcio stuff many years ago but my memory is to foggy on it to help you. Contact Joe I'm sure he'll help you out. 

Hey Craig Thanks I have spoke with Joe he is very receptive and helpful. Problem is I dont know what he talking about in regards to whats what on the mods that were done to the amps.  The story I got on them was a gent bought them had all the Curico Mods done. in the interim he switched speakers, so when he got the amps back he put them on a shelf for 6 years.

 

What I found is someone elses name on the Box that Curico shipped them to and I can see differences in the parts used on the Bias boards. I can not believe Curico would put different parts in a pair of amps. I cant believe any decent tech would do that.  I am of the opinion some one upgraded the amps using Joes parts at different times and now I have to consider that as a problem. Joe wants me to send them in but that will be a while and the added expense might not be worth while in the end (value VS what $$ invested)

 

I installed the tubes and shorting plugs and powered the amps on, No issues in that but without knowing the Bias and how to go about setting it I am not hooking them up to my speakers 😎

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Joe, 

 

    If you can take some detailed photos top, bottom and I'll take a peak and see if I can figure something out for you. Be patient my available time is very limited these days..

 

 

 I agree if he did both amps parts would match in both amps

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Joe, 

 

If you can locate the bias resistors to the Finals tubes, that go from the Final's tube's cathode tube socket pin, to ground, you can determine the bias from Ohm's Law. Voltage reading at that resistor's end which connects directly to the tube socket ( amp at idle, on its side, bottom cover off, be careful, lethal voltages exist ) divided by the the cathode resistor's resistance in Ohms,  ( measured when the amp is OFF )  equals the current being drawn across the resistor, stated in Amperes.  Convert your division,  Amperes computed result, divide by 1,000 into into Milliamperes. 

 

I don't know what type of Finals tube you are using.  But you could go on line and download a tube data sheet which will show you, which pin on the 8 - pin octal socket is the Cathode , which may be designated on the data sheet as " K ".

 

                                                           - - - - - - - - - - - - -- - - - - - - - - - - - - - - - - - - - - - - - - - -- - - - - -  -- - -  - - - - - -

 

From a general perspective, our listening experience with Dyna Mark 3 based amps ( Paoli 60Ms, etc. ) over the years was such, that we never kept them, longer term. But YMMV.

 

If you,, or a trusted local friend has a very good DIY capability, I can suggest a few simple conservative mods, that keeps the basic Curcio ( Dynaco, Latino etc. ) circuit fully intact - yet will nicely improve it ( better definition and much better dynamic contrasting ).  Parts cost, exclusive of shipping, is $12.00 to $21.00 for both amps.

 

Jeff Medwin

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